Subject: Southern California swarm
From: Pete Rowe  ptrowe@......... 
Date: Thu, 2 Apr 2009 09:43:38 -0700 (PDT)

FYI
This site
http://www.scsn.org/ 

has info on the Salton Sea swam near the Mexican border.
Pete



      
<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">FYI<br>This site<br>http://www.scsn.org/ <br><br>has info on the Salton Sea swam near the Mexican border.<br>Pete<br></td></tr></table><br>

      

Subject: Re: Designing a new vertical sensor
From: "Geoffrey"  gmvoeth@........... 
Date: Fri, 3 Apr 2009 17:49:37 -0700

NOTES From A layman (Vs Expert):

I believe that increasing the mass
will increase the signal to noise ratio but not sure.
I used an old 500Lb. seismometer once that
had a 100+ lb AVADUPOISE. ( I think ) mass and it would receive
even the surface waves well yet it was a 1 sec device.
Best vertical I ever tried.
USE Pb ( PlumBum ) as the mass.
A typical soda can of Lead.
Possibly 8 + LBS avd. or around 1 gallon of water.

I believe that using a balanced sensor will
make the electronics easier to build by
providing a proper input for a op amp diff amp.
As well as doubling the signal level
and somewhat lowering the noise level.
Noise will cancel 50% of the time but also
increase 50% time so possibly there is no
noise advantage to this.

A balanced sensor is two coils/magnets wired in
additive fashion with the center point grounded
making a single three wire sensor.
(SORT OF CLASS "B" push pull kind of thing but not exactly that)
But both must be matched as close as possible to being
identical. Both sensors can use the same mass
or be two separate single devices on the same
foundation (platform). Cable should be 100%
shielded and possibly the preamp located at the sensor
itself with maybe 50Ft of cable at most.

The shield should probably be cut just before reaching the
sensor but not sure. If everything is insulated from EARTH you
might surround even the sensor in the electrical ground.
Grounding is important to eliminate static and RFI
noise as well as the 60hz power hum that might originate
from power lines.

Use magnetic damping separate from the sensor
and you will get better output from the sensor.

IF you could place the mass in a vacuum
there would be no buoyancy effects for
changes in air density on the mass.

The greater the A/d Resolution the lower the overall
gain needs to be in the electronics.

Filter Low Pass the output so that the Aliasing
Freq occurs at 0Db or less of electrical gain if possible.

Match all your components as closely as possible
in the preamp to avoid baseline drifting and common
mode problems ( same signal on the two main signal leads ) .

Double regulate the power supply with at least
three+ volts between the output and the source.
So if you got 5 volts out you need at very least 8
volts in.

Anything at all that varies could affect the input
into your A/D converter. And all you want is pure signal.

The best of all would possibly be a three axis signal that is
mathematically combined to create a single magnitude.
But then you are not concerning yourself with the
three dimensions but only phases and first time
of arrival which is what interests myself the most.

Some people believe that the sensor magnet is fixed
to the physical ground
is the best way to go but not sure here since I have
had excellent results with short period devices
the other way around.

If you could string 100 devices together
50 on each side of Signal ground
And locate them on the same platform
just think of the sensitivity
that might produce. But who has that
kind of monies

It seems to me that all kinds of waves
may be realized in the vertical since
when you squeeze or relax forces in the earth
bulges will be realized at the surface
as vertical motions.
( Pardon my terms I am only a layman :-)  )

I think you are not interested in the electronics
but not sure about that. Need the tools.Expensive.
(designing/Making Your Own or building premade kits)
But you can do exactly what you want this way.
I do not recommend this unless you have great amount time
on your hands.
geoff

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Designing a new vertical sensor
From: "tchannel"  tchannel@............ 
Date: Fri, 3 Apr 2009 19:42:04 -0600

Thanks, Geoffrey,   I will read your suggestions and notes carefully.

Ted


----- Original Message ----- 
From: "Geoffrey" <gmvoeth@...........>
To: <psn-l@..............>
Sent: Friday, April 03, 2009 6:49 PM
Subject: Re: Designing a new vertical sensor


> NOTES From A layman (Vs Expert):
> 
> I believe that increasing the mass
> will increase the signal to noise ratio but not sure.
> I used an old 500Lb. seismometer once that
> had a 100+ lb AVADUPOISE. ( I think ) mass and it would receive
> even the surface waves well yet it was a 1 sec device.
> Best vertical I ever tried.
> USE Pb ( PlumBum ) as the mass.
> A typical soda can of Lead.
> Possibly 8 + LBS avd. or around 1 gallon of water.
> 
> I believe that using a balanced sensor will
> make the electronics easier to build by
> providing a proper input for a op amp diff amp.
> As well as doubling the signal level
> and somewhat lowering the noise level.
> Noise will cancel 50% of the time but also
> increase 50% time so possibly there is no
> noise advantage to this.
> 
> A balanced sensor is two coils/magnets wired in
> additive fashion with the center point grounded
> making a single three wire sensor.
> (SORT OF CLASS "B" push pull kind of thing but not exactly that)
> But both must be matched as close as possible to being
> identical. Both sensors can use the same mass
> or be two separate single devices on the same
> foundation (platform). Cable should be 100%
> shielded and possibly the preamp located at the sensor
> itself with maybe 50Ft of cable at most.
> 
> The shield should probably be cut just before reaching the
> sensor but not sure. If everything is insulated from EARTH you
> might surround even the sensor in the electrical ground.
> Grounding is important to eliminate static and RFI
> noise as well as the 60hz power hum that might originate
> from power lines.
> 
> Use magnetic damping separate from the sensor
> and you will get better output from the sensor.
> 
> IF you could place the mass in a vacuum
> there would be no buoyancy effects for
> changes in air density on the mass.
> 
> The greater the A/d Resolution the lower the overall
> gain needs to be in the electronics.
> 
> Filter Low Pass the output so that the Aliasing
> Freq occurs at 0Db or less of electrical gain if possible.
> 
> Match all your components as closely as possible
> in the preamp to avoid baseline drifting and common
> mode problems ( same signal on the two main signal leads ) .
> 
> Double regulate the power supply with at least
> three+ volts between the output and the source.
> So if you got 5 volts out you need at very least 8
> volts in.
> 
> Anything at all that varies could affect the input
> into your A/D converter. And all you want is pure signal.
> 
> The best of all would possibly be a three axis signal that is
> mathematically combined to create a single magnitude.
> But then you are not concerning yourself with the
> three dimensions but only phases and first time
> of arrival which is what interests myself the most.
> 
> Some people believe that the sensor magnet is fixed
> to the physical ground
> is the best way to go but not sure here since I have
> had excellent results with short period devices
> the other way around.
> 
> If you could string 100 devices together
> 50 on each side of Signal ground
> And locate them on the same platform
> just think of the sensitivity
> that might produce. But who has that
> kind of monies
> 
> It seems to me that all kinds of waves
> may be realized in the vertical since
> when you squeeze or relax forces in the earth
> bulges will be realized at the surface
> as vertical motions.
> ( Pardon my terms I am only a layman :-)  )
> 
> I think you are not interested in the electronics
> but not sure about that. Need the tools.Expensive.
> (designing/Making Your Own or building premade kits)
> But you can do exactly what you want this way.
> I do not recommend this unless you have great amount time
> on your hands.
> geoff
> 
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Changes to my Lehman sensor
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sat, 04 Apr 2009 02:14:15 +0000

Hello

I have made changes to my Lehman type sensor. It now works (peak is
there) on 0.3Hz, with the lower end around 0.030Hz. I hope that this is
good enough for me to record teleseismic events.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Lehman sensor help ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sat, 04 Apr 2009 15:40:17 +0000

Hello

Can some one help me with checking the lehman sensor data that I
currently get. I did not record the Mw6.2 earthquake this night. I did
also not record a Mb4.7 earthquake close to Jan Mayen this morning. It
did not show up on any of my sensors.

The sensor spikes at 0.3Hz, but that might be because I live close the
ocean.

If anyone has intresting in getting data from the sensor to check out. I
can send it.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Designing a new vertical sensor
From: "Geoffrey"  gmvoeth@........... 
Date: Sat, 4 Apr 2009 08:53:15 -0700

Hello tchannel;

If you were to mathematically combine
using trig or whatever three seismic signals
the signals must be captured in synchronization.
This means all samples (X,Y,Z) have to be collected
at the very same instants in time.
I have never seen such a thing before in
the civilian world.

geoff

----- Original Message ----- 
From: "tchannel" <tchannel@............>
To: <psn-l@..............>
Sent: Friday, April 03, 2009 6:42 PM
Subject: Re: Designing a new vertical sensor


> Thanks, Geoffrey,   I will read your suggestions and notes carefully.
> 
> Ted
> 
> 
> ----- Original Message ----- 
> From: "Geoffrey" <gmvoeth@...........>
> To: <psn-l@..............>
> Sent: Friday, April 03, 2009 6:49 PM
> Subject: Re: Designing a new vertical sensor
> 
> 
>> NOTES From A layman (Vs Expert):
>> 
>> I believe that increasing the mass
>> will increase the signal to noise ratio but not sure.
>> I used an old 500Lb. seismometer once that
>> had a 100+ lb AVADUPOISE. ( I think ) mass and it would receive
>> even the surface waves well yet it was a 1 sec device.
>> Best vertical I ever tried.
>> USE Pb ( PlumBum ) as the mass.
>> A typical soda can of Lead.
>> Possibly 8 + LBS avd. or around 1 gallon of water.
>> 
>> I believe that using a balanced sensor will
>> make the electronics easier to build by
>> providing a proper input for a op amp diff amp.
>> As well as doubling the signal level
>> and somewhat lowering the noise level.
>> Noise will cancel 50% of the time but also
>> increase 50% time so possibly there is no
>> noise advantage to this.
>> 
>> A balanced sensor is two coils/magnets wired in
>> additive fashion with the center point grounded
>> making a single three wire sensor.
>> (SORT OF CLASS "B" push pull kind of thing but not exactly that)
>> But both must be matched as close as possible to being
>> identical. Both sensors can use the same mass
>> or be two separate single devices on the same
>> foundation (platform). Cable should be 100%
>> shielded and possibly the preamp located at the sensor
>> itself with maybe 50Ft of cable at most.
>> 
>> The shield should probably be cut just before reaching the
>> sensor but not sure. If everything is insulated from EARTH you
>> might surround even the sensor in the electrical ground.
>> Grounding is important to eliminate static and RFI
>> noise as well as the 60hz power hum that might originate
>> from power lines.
>> 
>> Use magnetic damping separate from the sensor
>> and you will get better output from the sensor.
>> 
>> IF you could place the mass in a vacuum
>> there would be no buoyancy effects for
>> changes in air density on the mass.
>> 
>> The greater the A/d Resolution the lower the overall
>> gain needs to be in the electronics.
>> 
>> Filter Low Pass the output so that the Aliasing
>> Freq occurs at 0Db or less of electrical gain if possible.
>> 
>> Match all your components as closely as possible
>> in the preamp to avoid baseline drifting and common
>> mode problems ( same signal on the two main signal leads ) .
>> 
>> Double regulate the power supply with at least
>> three+ volts between the output and the source.
>> So if you got 5 volts out you need at very least 8
>> volts in.
>> 
>> Anything at all that varies could affect the input
>> into your A/D converter. And all you want is pure signal.
>> 
>> The best of all would possibly be a three axis signal that is
>> mathematically combined to create a single magnitude.
>> But then you are not concerning yourself with the
>> three dimensions but only phases and first time
>> of arrival which is what interests myself the most.
>> 
>> Some people believe that the sensor magnet is fixed
>> to the physical ground
>> is the best way to go but not sure here since I have
>> had excellent results with short period devices
>> the other way around.
>> 
>> If you could string 100 devices together
>> 50 on each side of Signal ground
>> And locate them on the same platform
>> just think of the sensitivity
>> that might produce. But who has that
>> kind of monies
>> 
>> It seems to me that all kinds of waves
>> may be realized in the vertical since
>> when you squeeze or relax forces in the earth
>> bulges will be realized at the surface
>> as vertical motions.
>> ( Pardon my terms I am only a layman :-)  )
>> 
>> I think you are not interested in the electronics
>> but not sure about that. Need the tools.Expensive.
>> (designing/Making Your Own or building premade kits)
>> But you can do exactly what you want this way.
>> I do not recommend this unless you have great amount time
>> on your hands.
>> geoff
>> 
>> __________________________________________________________
>> 
>> Public Seismic Network Mailing List (PSN-L)
>> 
>> To leave this list email PSN-L-REQUEST@.............. with 
>> the body of the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Designing a new vertical sensor
From: Robert McClure  bobmcclure90@......... 
Date: Sat, 4 Apr 2009 17:19:54 -0400

Hi Ted,

  Note that mass itself does not have much influence on sensitivity,
and high mass makes proper damping harder to achieve. I can see no
advantage to having balanced outputs.

  A seismometer using a vertical spring is the worst design possible.
For example, a vertical spring must be stretched one meter from its
zero length to obtain a natural period of two seconds. You should take
a look at the AS-1 student seismometer

 http://www.jclahr.com/science/psn/as1/index.html

  Also, see the vertical  sensor described on my web site

  http://bobmcclure90.googlepages.com/sitemap

  While you are there, download the "SpringCalc.zip" file.
Experimenting with this application will help you in designing a
vertical seismometer, using whatever spring you might have available.

  Whatever you do, use magnetic damping or shunt resistive damping,
never oil damping.

  Amateur vertical sensors usually have too short a period for
adequately displaying teleseisms, especially the S and L phases. The
AS-1 uses a "bass boost amplifier to make up for loss of long-period
response. However, my WQFilter program can extend the useful period by
many times without the need for electronic compensation. My sensor has
a period of 4.4 seconds, but I use WQFilter to extend the response to
32 seconds. I use an amplifier built by Larry Cochrane, modified to
pass DC by shorting out the interstage coupling capacitor. The
resulting output bias level is somewhat sensitive to ambient
temperature rate of change, but tolerable. I found the amplifier to be
unstable when hooked up to my sensor. This problem was cured by
placing a one microfarad bipolar capacitor across the input terminals.

Cheers,

Bob
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Designing a new vertical sensor
From: ChrisAtUpw@.......
Date: Sat, 4 Apr 2009 22:06:24 EDT

In a message dated 04/04/2009, gmvoeth@........... writes:

I  believe that increasing the mass will increase the signal to noise ratio 
but  not sure.
I used an old 500Lb. seismometer once 
Hi Geoff,
 
    You can get away fine with 500gm to 1kg mass.  Anything more just adds 
cost and construction problems. You only needed  massive weights to drive a 
mechanical amplifier + a pen on chart paper. This  went out with photographic and 
later with direct electronic recording.
 
I believe that using a balanced sensor will make the electronics easier  to 
build by providing a proper input for a op amp diff amp.
 
    You should NOT be limited by electronic noise. It  is background seismic 
noise which is the problem. A single ended stage is quite  satisfactory. If 
you are troubled by electronic noise, redesign your amplifier,  or copy a known 
good circuit.
    You can wind a bifilar coil, but differential input  opamps do not have 
the very low noise that you can get from single opamps. You  can also buy 
bifilar insulated equipment wire. The INA118 is one of the  best of the 
differential amplifier types.

A  balanced sensor is two coils/magnets wired in additive fashion with the 
center  point grounded
making a single three wire sensor. But both must be  matched as close as 
possible to being
identical. Both sensors can use the  same mass or be two separate single 
devices on the same
foundation  (platform). 
    Do it if it makes you happy, but it is not  necessary

Cable  should be 100% shielded and possibly the preamp located at the sensor 
itself  with maybe 50Ft of cable at most.
    Short, buried cable runs are to be preferred. Use  cable with a woven 
braid shield. You also need to consider lightning  protection for long cable runs.

The  shield should probably be cut just before reaching the sensor but not 
sure. If  everything is insulated from EARTH you might surround even the sensor 
in the  electrical ground. Grounding is important to eliminate static and RFI 
noise as  well as the 60hz power hum that might originate
from power  lines.
    Earth the sensor frame through the coaxial shield  braid. Earth the cable 
at the amplifier input.

Use  magnetic damping separate from the sensor and you will get better output 
from  the sensor.
    This will lower the noise.

IF you  could place the mass in a vacuum there would be no buoyancy effects 
for  changes in air density on the mass.
    You can either place the sensor in a sealed  container or compensate the 
arm with a sealed balance wolume. A vacuum is not  essential, but it can 
eliminate any convection noise.

The  greater the A/D Resolution the lower the overall gain needs to be in the 
 electronics.
    Preferably use an ADC with 16 bit +/-1/2 LSB  resolution. Some of the 
Sigma-Delta converters give this, but with old fast  ADCs you may need to use 
signal averaging to remove the converter noise,  sometines three bits.

Filter  Low Pass the output so that the Aliasing Freq occurs at 0Db or less 
of  electrical gain if possible.
    Set the loss at the Aliasing frequency to be at  least 20 dB, preferably 
30 to 40 dB

Match  all your components as closely as possible in the preamp to avoid 
baseline  drifting and common mode problems (same signal on the two main signal  
leads).
    Use 1% Metal Film resistors only, never carbon. You  may want to buy 5% 
capacitors and then pick out near matching pairs for filters.  Use polyester 
coupling capacitors, NOT Alumium or Tantalum  Electrolytics.  

Double  regulate the power supply with at least three + volts between the 
output and  the source.
So if you got 5 volts out you need at very least 8 volts  in.
    Using 15V and then 12V regulators in series will  reduce noise and drift.

Anything  at all that varies could affect the input
into your A/D converter. And all  you want is pure signal.

The best of all would possibly be a three axis  signal that is mathematically 
combined to create a single magnitude. But then  you are not concerning 
yourself with the three dimensions but only phases and  first time of arrival which 
is what interests myself the  most.
    You usually want to know the amplitudes and phases  of the three 
components separately. This gives you the directional  information. 

Some  people believe that the sensor magnet is fixed to the physical ground 
is the  best way to go but not sure here since I have had excellent results 
with short  period devices the other way around.
    DO NOT put magnets on the arm, unless they are  totally shielded and even 
this is inadvisable. DO NOT use ferromagnetic  components on the arm unless 
absloutely necessary. A Brass mass is preferable to  Lead. It is easier to 
machine, physically stronger and you can drill and  tap holes in it. Lead is so 
soft that it can relax under a clamp, but you can  soft solder it to brass 
fixture. 

If you  could string 100 devices together 50 on each side of Signal ground 
And locate  them on the same platform just think of the sensitivity that might 
produce.  But who has that kind of monies
    This would be an array. They are principally used  in direction finding, 
CTBT Arays, Volcanoes and for reducing local seismic  noise. 

I think  you are not interested in the electronics but not sure about that. 
Need the  tools. Expensive.
(designing/Making Your Own or building premade kits) But  you can do exactly 
what you want this way. I do not recommend this unless you  have great amount 
time on your hands.
    Either buy an amplifier from Larry, build a similar  type from John's 
website, or get interested in electronics. Some systems like  the above require a 
period extending amplifier.
 
 
 
Take a look at Dewayne Hill's vertical at 
_http://jclahr.com/science/psn/hill/index.html_ (http://jclahr.com/science/psn/hill/index.html) 

 
    Then add quad magnetic block + plate damping. DON'T  bother to try out 
oil damping!
 
    Remove the knife edge suspension and substitute two  flex wires in 
tension. This reduces noise.
 
    Clamp both ends of the suspension spring. This  reduces noise.
 
    Add a quad magnet block + rectangular sensor coil  to give a greatly 
increased signal output, probably > 20x.
 
    Fit a 1/f^2 to linear amplifier and you  can sense quakes from 5 Hz to 20 
seconds very nicely. 
 
    This avoids the problems associated with the high  thermal coefficient of 
steel springs / providing Ni-SpanC springs. 
 
    Aim for a mass of about 1 lb and cut the spring  length to suit. 
 
    Regards,
 
    Chris  Chapman

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
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<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY:=20=
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bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Drol=
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face=3DArial color=3D#000000 size=3D2>
<DIV>In a message dated 04/04/2009, gmvoeth@........... writes:</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>I=20
  believe that increasing the mass will increase the signal to noise ratio b=
ut=20
  not sure.<BR>I used an old 500Lb. seismometer once </FONT></BLOCKQUOTE>
<DIV>Hi Geoff,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You can get away fine with 500gm to 1kg mass.=20
Anything more just adds cost and construction problems.&nbsp;You only needed=
=20
massive weights to drive a mechanical amplifier + a pen on chart paper. This=
=20
went out with photographic and later with direct electronic recording.</DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000=
000=20
size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000=
000=20
size=3D2>I believe that using a balanced sensor will make the electronics ea=
sier=20
to build by providing a proper input for a op amp diff amp.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You should NOT be limited by electronic noise.=20=
It=20
is background seismic noise which is the problem. A single ended stage is qu=
ite=20
satisfactory. If you are troubled by electronic noise, redesign your amplifi=
er,=20
or copy a known good circuit.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You can wind a bifilar coil, but differential i=
nput=20
opamps do not have the very low noise that you can get from single opamps. Y=
ou=20
can also buy bifilar insulated equipment wire.&nbsp;The INA118 is one of the=
=20
best of the differential amplifier types.</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>A=20
  balanced sensor is two coils/magnets wired in additive fashion with the ce=
nter=20
  point grounded<BR>making a single three wire sensor.&nbsp;But both must be=
=20
  matched as close as possible to being<BR>identical. Both sensors can use t=
he=20
  same mass or be two separate single devices on the same<BR>foundation=20
  (platform). </FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Do it if it makes you happy, but it is not=20
necessary</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>Cable=20
  should be 100% shielded and possibly the preamp located at the sensor itse=
lf=20
  with maybe 50Ft of cable at most.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Short, buried cable runs are to be preferred. U=
se=20
cable with a woven braid shield. You also need to consider&nbsp;lightning=20
protection for long cable runs.</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>The=20
  shield should probably be cut just before reaching the sensor but not sure=
.. If=20
  everything is insulated from EARTH you might surround even the sensor in t=
he=20
  electrical ground. Grounding is important to eliminate static and RFI nois=
e as=20
  well as the 60hz power hum that might originate<BR>from power=20
lines.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Earth the sensor frame through the coaxial shie=
ld=20
braid.&nbsp;Earth the cable at the amplifier input.</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>Use=20
  magnetic damping separate from the sensor and you will get better output f=
rom=20
  the sensor.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;This will lower the noise.</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>IF you=20
  could place the mass in a vacuum there would be no buoyancy effects for=20
  changes in air density on the mass.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You can either place the sensor in a sealed=20
container or compensate the arm with a sealed balance wolume. A vacuum is no=
t=20
essential, but it can eliminate any convection noise.</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>The=20
  greater the A/D Resolution the lower the overall gain needs to be in the=20
  electronics.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Preferably use an ADC with 16 bit +/-1/2 LSB=20
resolution. Some of the Sigma-Delta converters give this, but&nbsp;with old=20=
fast=20
ADCs you may need to use signal averaging to remove the converter noise,=20
sometines three bits.</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>Filter=20
  Low Pass the output so that the Aliasing Freq occurs at 0Db or less of=20
  electrical gain if possible.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Set the loss at the Aliasing frequency to be at=
=20
least 20 dB, preferably 30 to 40 dB</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>Match=20
  all your components as closely as possible in the preamp to avoid baseline=
=20
  drifting and common mode problems (same signal on the two main signal=20
  leads).</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Use 1% Metal Film resistors only, never carbon.=
 You=20
may want to buy 5% capacitors and then pick out near matching pairs for filt=
ers.=20
Use polyester coupling capacitors,&nbsp;NOT Alumium or Tantalum=20
Electrolytics.&nbsp;&nbsp;</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>Double=20
  regulate the power supply with at least three + volts between the output a=
nd=20
  the source.<BR>So if you got 5 volts out you need at very least 8 volts=20
  in.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Using 15V and then 12V regulators in series wil=
l=20
reduce noise and drift.</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>Anything=20
  at all that varies could affect the input<BR>into your A/D converter. And=20=
all=20
  you want is pure signal.<BR><BR>The best of all would possibly be a three=20=
axis=20
  signal that is mathematically combined to create a single magnitude. But t=
hen=20
  you are not concerning yourself with the three dimensions but only phases=20=
and=20
  first time of arrival which is what interests myself the=20
most.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You usually want to know the amplitudes and pha=
ses=20
of the three components separately. This gives you the directional=20
information.&nbsp;</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>Some=20
  people believe that the sensor magnet is fixed to the physical ground is t=
he=20
  best way to go but not sure here since I have had excellent results with s=
hort=20
  period devices the other way around.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;DO NOT put magnets on the arm, unless they are=20
totally shielded and even this is inadvisable. DO NOT use ferromagnetic=20
components on the arm unless absloutely necessary. A Brass mass is preferabl=
e to=20
Lead. It is easier to machine,&nbsp;physically stronger and you can drill an=
d=20
tap holes in it. Lead is so soft that it can relax under a clamp, but you ca=
n=20
soft solder it to brass fixture.&nbsp;</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>If you=20
  could string 100 devices together 50 on each side of Signal ground And loc=
ate=20
  them on the same platform just think of the sensitivity that might produce=
..=20
  But who has that kind of monies</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;This would be an array. They are principally us=
ed=20
in direction finding, CTBT Arays, Volcanoes&nbsp;and for reducing local seis=
mic=20
noise.&nbsp;</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>I think=20
  you are not interested in the electronics but not sure about that. Need th=
e=20
  tools. Expensive.<BR>(designing/Making Your Own or building premade kits)=20=
But=20
  you can do exactly what you want this way. I do not recommend this unless=20=
you=20
  have great amount time on your hands.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Either buy an amplifier from Larry, build a sim=
ilar=20
type from John's website, or get interested in electronics. Some systems lik=
e=20
the above require a period extending amplifier.</DIV>
<DIV><FONT id=3Drolx_document face=3DArial color=3D#000000 size=3D2>&nbsp;</=
DIV>
<DIV>
<DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Take a look at Dewayne Hill's vertical at <A=20
title=3Dhttp://jclahr.com/science/psn/hill/index.html=20
href=3D"http://jclahr.com/science/psn/hill/index.html">http://jclahr.com/sci=
ence/psn/hill/index.html</A></DIV></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Then add quad magnetic block + plate damping. D=
ON'T=20
bother to try out oil damping!</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Remove the knife edge suspension and substitute=
 two=20
flex wires in tension. This reduces noise.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Clamp both ends of the suspension spring. This=20
reduces noise.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Add a quad magnet block + rectangular sensor co=
il=20
to give a greatly increased signal output, probably &gt; 20x.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Fit a 1/f^2 to linear amplifier and you=20
can&nbsp;sense quakes from 5 Hz to 20 seconds very nicely.&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;This avoids the problems associated with the hi=
gh=20
thermal coefficient of steel springs / providing Ni-SpanC springs.&nbsp;</DI=
V>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Aim for a mass of about 1 lb and cut the spring=
=20
length to suit. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris=20
Chapman</DIV></FONT></DIV></FONT></BODY></HTML>

Subject: Re: Changes to my Lehman sensor
From: ChrisAtUpw@.......
Date: Sat, 4 Apr 2009 22:15:29 EDT

 
In a message dated 04/04/2009 03:33:28 GMT Daylight Time, jonfr@.........  
writes:

I have  made changes to my Lehman type sensor. It now works (peak is
there) on  0.3Hz, with the lower end around 0.030Hz. I hope that this is
good enough  for me to record teleseismic events.



Hi Jon,
 
    Can you extract about 10 minutes of the data file  with background noise 
on it and send it to me please?
 
    What changes have you made to your Lehman?
 
    Regards, 
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16809" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY:=20=
Arial"=20
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Drol=
e_document=20
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 04/04/2009 03:33:28 GMT Daylight Time, jonfr@........
om=20
writes:</DIV>
<BLOCKQUOTE=20
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size=
=3D2>I have=20
  made changes to my Lehman type sensor. It now works (peak is<BR>there) on=20
  0.3Hz, with the lower end around 0.030Hz. I hope that this is<BR>good enou=
gh=20
  for me to record teleseismic events.<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Jon,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Can you extract about 10 minutes of the data fi=
le=20
with background noise on it and send it to me please?</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;What changes have you made to your Lehman?</DIV=
>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Ocean noise ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Mon, 06 Apr 2009 18:09:49 +0000

Hi

Where is the ocean noise when I look at seismometer ? I think I finally
got my lehman seismomter right, I did do some changes today. However,
there is a spike around 0.5Hz and it is huge. I do live close the ocean,
the distance is less then 100 meters. So I am wondering if I am seeing
noise from the ocean that is close to me.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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Subject: Re: Ocean noise ?
From: Thomas Dick  dickthomas01@............. 
Date: Mon, 06 Apr 2009 14:30:39 -0500

Jón Frímann
I was watching something between 17:22 and 17:30 here in southern 
Indiana USA. I was waiting for an update to the earthquake list which 
hasn't shown any new listings since about 13:00. I thought maybe 
aftershocks in Italy. I show a minor peak on FFT's around .5 but a much 
more pronounced peak at .05 on the Lehmans. What has confused me is the 
high "peaks" on FFT's on the 4.5 hz geophones from .05 down to .005. 
(Maybe "peaks" aren't the word for it --- but there is a general down 
slope from .005 to .5 which isn't there normally....and all the 
horizontal units show this trend.) tom d
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Subject: Re: Changes to my Lehman sensor
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Tue, 07 Apr 2009 03:13:30 +0000

Hello

Here is the latest change to my lehman sensor. It peaks around 0.7Hz,
but FFT check shows activity down to 0.02Hz or about.

Here is the picture of the latest change.

http://www.jonfr.com/myndir/v/geology/seismometer/p4070001.jpg.html

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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Subject: Re: Changes to my Lehman sensor
From: KipECS@.......
Date: Tue, 7 Apr 2009 00:56:47 EDT

Nice pictures, interesting construction technique and  improvement
 
 
In a message dated 4/6/2009 11:13:52 P.M. Eastern Daylight Time,  
jonfr@......... writes:

http://www.jonfr.com/myndir/v/geology/seismometer/p4070001.jpg.html

**************A Good Credit Score is 700 or Above. See yours in just 2 easy 
steps! 
(http://pr.atwola.com/promoclk/100126575x1221421323x1201417385/aol?redir=http:%2F%2Fwww.freecreditreport.com%2Fpm%2Fdefault.aspx%3Fsc%3D668072%26hmpgID
%3D62%26bcd%3DAprilfooterNO62)
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3DUS-ASCII" http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702"></HEAD>
<BODY style=3D"FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 10pt" id=3Drol=
e_body=20
bottomMargin=3D7 leftMargin=3D7 rightMargin=3D7 topMargin=3D7><FONT id=3Drol=
e_document=20
color=3D#000000 size=3D2 face=3DArial>
<DIV>Nice pictures, interesting construction&nbsp;technique and=20
improvement</DIV>
<DIV>&nbsp;</DIV>
<DIV>
<DIV>In a message dated 4/6/2009 11:13:52 P.M. Eastern Daylight Time,=20
jonfr@......... writes:</DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: 5px"><=
FONT=20
  style=3D"BACKGROUND-COLOR: transparent" color=3D#000000 size=3D2=20
  face=3DArial>http://www.jonfr.com/myndir/v/geology/seismometer/p4070001.jp=
g.html</FONT></BLOCKQUOTE></DIV></FONT><br/><font style=3D"color:black;font:=
normal 10pt arial,san-serif;"> <hr style=3D"margin-top:10px"/><B>A Good Cred=
it Score is 700 or Above. <A HREF=3D"http://pr.atwola.com/promoclk/100126575=
x1221421323x1201417385/aol?redir=3Dhttp:%2F%2Fwww.freecreditreport.com%2Fpm%=
2Fdefault.aspx%3Fsc%3D668072%26hmpgID%3D62%26bcd%3DAprilfooterNO62"> See you=
rs in just 2 easy steps!</A></B></font></DIV></BODY></HTML>

Subject: Re: Changes to my Lehman sensor
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Tue, 07 Apr 2009 19:32:41 +0000

Hi

I belive that I found the last problem (according to the idea). The last
problem is the alunium rod that I have used as an arm. I belive that it
was too soft to work properly and because of that I didn't behave
correctly.

I am going to replace it with iron based arm and there is going to be a
steel based end on it. I hope that gives me the resault that I want.

Regards.
J=F3n Fr=EDmann.

On =FEri, 2009-04-07 at 00:56 -0400, KipECS@....... wrote:
> Nice pictures, interesting construction technique and improvement
> =20
> In a message dated 4/6/2009 11:13:52 P.M. Eastern Daylight Time,
> jonfr@......... writes:
>         http://www.jonfr.com/myndir/v/geology/seismometer/p4070001.jpg.ht=
ml
>=20


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Public Seismic Network Mailing List (PSN-L)


Subject: Re: Changes to my Lehman sensor
From: Dave Nelson  dave.nelson@............... 
Date: Wed, 08 Apr 2009 06:43:47 +1000

Hi Jon,
                having iron in that area within the field of the magnet is=
=20
not a good idea
you would be much better off to use brass  if you didnt want to use=
 aluminium.

    I also notice from your photo's that your pickup wire from the coil
a rather heavy looking wire will also affect the movement of the arm.  The=
=20
usual
practice, if  a person insists of putting the coil on the arm, is to=20
terminate the
heavier wire at the pivot end of the arm and to use VERY FINE  from that=20
termination,  say 24-28 SWG enamelled wire wound in a loose coil say ~ 5=
 turns
  of pencil/ pen diameter, then terminate that fine wire on the base of the=
=20
seismom.
and then run heavier wire  again to the electronics.

I can almost guarantee that the way you have taken your wire off the arm=20
will have
a serious effect on the free movement of the arm!

Dave N
Sydney




At 07:32 PM 4/7/2009 +0000, you wrote:
>Hi
>I belive that I found the last problem (according to the idea). The last
>problem is the alunium rod that I have used as an arm. I belive that it
>was too soft to work properly and because of that I didn't behave
>correctly.
>I am going to replace it with iron based arm and there is going to be a
>steel based end on it. I hope that gives me the resault that I want.
>Regards.
>J=F3n Fr=EDmann.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: RE: Changes to my Lehman sensor
From: "Gary Lindgren"  gel@................. 
Date: Tue, 7 Apr 2009 13:53:07 -0700

Jon,
Without damping, cause the pendulum to swing a few centimeters and =
record
how long it takes for the swing distance to drop to 1/2 the original =
width.
Also what is the resonant period?
Gary



-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Tuesday, April 07, 2009 12:33 PM
To: psn-l@..............
Subject: Re: Changes to my Lehman sensor

Hi

I belive that I found the last problem (according to the idea). The last
problem is the alunium rod that I have used as an arm. I belive that it
was too soft to work properly and because of that I didn't behave
correctly.

I am going to replace it with iron based arm and there is going to be a
steel based end on it. I hope that gives me the resault that I want.

Regards.
J=F3n Fr=EDmann.

On =FEri, 2009-04-07 at 00:56 -0400, KipECS@....... wrote:
> Nice pictures, interesting construction technique and improvement
> =20
> In a message dated 4/6/2009 11:13:52 P.M. Eastern Daylight Time,
> jonfr@......... writes:
>
http://www.jonfr.com/myndir/v/geology/seismometer/p4070001.jpg.html
>=20


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Subject: Re: Changes to my Lehman sensor
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Wed, 08 Apr 2009 00:57:11 +0000

Hi

I will change the wire layout when I get the new arm. I was adviced to
keep the coil on the arm, not the base it self.

The natrual period of the sensor as it was setup was around 0.3Hz. But
it's range was only limited to that.

Regards.
J=F3n Fr=EDmann.

On mi=F0, 2009-04-08 at 06:43 +1000, Dave Nelson wrote:
> Hi Jon,
>                 having iron in that area within the field of the magnet i=
s=20
> not a good idea
> you would be much better off to use brass  if you didnt want to use alumi=
nium.
>=20
>     I also notice from your photo's that your pickup wire from the coil
> a rather heavy looking wire will also affect the movement of the arm.  Th=
e=20
> usual
> practice, if  a person insists of putting the coil on the arm, is to=20
> terminate the
> heavier wire at the pivot end of the arm and to use VERY FINE  from that=20
> termination,  say 24-28 SWG enamelled wire wound in a loose coil say ~ 5 =
turns
>   of pencil/ pen diameter, then terminate that fine wire on the base of t=
he=20
> seismom.
> and then run heavier wire  again to the electronics.
>=20
> I can almost guarantee that the way you have taken your wire off the arm=20
> will have
> a serious effect on the free movement of the arm!
>=20
> Dave N
> Sydney
>=20
>=20
>=20
>=20
> At 07:32 PM 4/7/2009 +0000, you wrote:
> >Hi
> >I belive that I found the last problem (according to the idea). The last
> >problem is the alunium rod that I have used as an arm. I belive that it
> >was too soft to work properly and because of that I didn't behave
> >correctly.
> >I am going to replace it with iron based arm and there is going to be a
> >steel based end on it. I hope that gives me the resault that I want.
> >Regards.
> >J=F3n Fr=EDmann.
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: RE: Changes to my Lehman sensor
From: "Gary Lindgren"  gel@................. 
Date: Wed, 8 Apr 2009 09:52:41 -0700

Hi Jon,
Have you tried raising the front end of the sensor to increase the =
period.
Were you able to measure the time it takes the undamped arm swing =
distance
to reduce by 1/2 after a gentle push.
Gary




-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Tuesday, April 07, 2009 5:57 PM
To: psn-l@..............
Subject: Re: Changes to my Lehman sensor

Hi

I will change the wire layout when I get the new arm. I was adviced to
keep the coil on the arm, not the base it self.

The natrual period of the sensor as it was setup was around 0.3Hz. But
it's range was only limited to that.

Regards.
J=F3n Fr=EDmann.

On mi=F0, 2009-04-08 at 06:43 +1000, Dave Nelson wrote:
> Hi Jon,
>                 having iron in that area within the field of the =
magnet is

> not a good idea
> you would be much better off to use brass  if you didnt want to use
aluminium.
>=20
>     I also notice from your photo's that your pickup wire from the =
coil
> a rather heavy looking wire will also affect the movement of the arm.  =
The

> usual
> practice, if  a person insists of putting the coil on the arm, is to=20
> terminate the
> heavier wire at the pivot end of the arm and to use VERY FINE  from =
that=20
> termination,  say 24-28 SWG enamelled wire wound in a loose coil say ~ =
5
turns
>   of pencil/ pen diameter, then terminate that fine wire on the base =
of
the=20
> seismom.
> and then run heavier wire  again to the electronics.
>=20
> I can almost guarantee that the way you have taken your wire off the =
arm=20
> will have
> a serious effect on the free movement of the arm!
>=20
> Dave N
> Sydney
>=20
>=20
>=20
>=20
> At 07:32 PM 4/7/2009 +0000, you wrote:
> >Hi
> >I belive that I found the last problem (according to the idea). The =
last
> >problem is the alunium rod that I have used as an arm. I belive that =
it
> >was too soft to work properly and because of that I didn't behave
> >correctly.
> >I am going to replace it with iron based arm and there is going to be =
a
> >steel based end on it. I hope that gives me the resault that I want.
> >Regards.
> >J=F3n Fr=EDmann.
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.

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Subject: Neodymium sphere and Lahmen pivot
From: "Robert O. Green"  rog@.......... 
Date: Wed, 08 Apr 2009 20:07:11 -0700

Has anyone used an Neodymium sphere or pair of sphere magnets as a 
Lahmen pivot?

Rob


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Subject: Re: Neodymium sphere and Lahmen pivot
From: ChrisAtUpw@.......
Date: Thu, 9 Apr 2009 07:43:47 EDT

 
In a message dated 09/04/2009, rog@.......... writes:

Has  anyone used an Neodymium sphere or pair of sphere magnets as a Lehman  
pivot?
Rob



Hi Rob,
 
    No, but I would not expect it to last long, or work  well. The magnets 
are hard plated with Nickel, which is not a particularly hard  metal. 
 
    Stainless steel ball bearings work well as do hard  chrome steel 
scalpel blades for a counterface. You might try a NdFeB cube magnet  under a 
scalpel blade, but I would expect the magnetic hysteresis at the contact  point 
to give 'sticky' results.
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16809" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 09/04/2009, rog@.......... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>Has 
  anyone used an Neodymium sphere or pair of sphere magnets as a Lehman 
  pivot?<BR>Rob<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Rob,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;No, but I would not expect it to last long,=
 or work 
well. The magnets are hard plated with Nickel, which is not a particularly=
 hard 
metal. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Stainless steel ball bearings work well as do=
 hard 
chrome steel scalpel blades for a counterface. You might try a NdFeB cube=
 magnet 
under a scalpel blade, but I would expect the magnetic hysteresis at the=
 contact 
point to give 'sticky' results.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Best Lahmen pivot
From: "Robert O. Green"  rog@.......... 
Date: Thu, 09 Apr 2009 06:35:39 -0700

Chris,

Thank you.

Is a scalpel blade against a steel ball bearing the current best 
consensus for a Lehman pivot?

rob

ChrisAtUpw@....... wrote:
> In a message dated 09/04/2009, rog@.......... writes:
>
>     Has anyone used an Neodymium sphere or pair of sphere magnets as a
>     Lehman pivot?
>     Rob
>
> Hi Rob,
>     No, but I would not expect it to last long, or work well. The 
> magnets are hard plated with Nickel, which is not a particularly hard 
> metal.
>     Stainless steel ball bearings work well as do hard chrome steel 
> scalpel blades for a counterface. You might try a NdFeB cube magnet 
> under a scalpel blade, but I would expect the magnetic hysteresis at 
> the contact point to give 'sticky' results.
>     Regards,
>     Chris Chapman
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com
> Version: 8.0.176 / Virus Database: 270.11.48/2048 - Release Date: 4/8/2009 7:02 PM
>
>   


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Best Lehman pivot
From: ChrisAtUpw@.......
Date: Thu, 9 Apr 2009 11:43:23 EDT

 
In a message dated 09/04/2009, rog@.......... writes:

Is a  scalpel blade against a steel ball bearing the current best consensus 
for a  Lehman pivot?
rob



Hi Rob,
 
    Crossed cylinders can be a bit better.  The surfaces need to highly 
polished. The SEP uses 1/8" OD polished Tungsten  Carbide needle rollers, but 
these may be rather expensive / difficult to obtain  depending on where you 
live. See _http://www.bgs.ac.uk/education/school_seismology/seismometer.html_ 
(http://www.bgs.ac.uk/education/school_seismology/seismometer.html)  You  
mount both the vertical rollers on the frame. 
 
    However, a polished SS plane rolling on a SS ball  bearing works 
perfectly well and it may cost only 50 c! See _http://www.smallparts.com/_ 
(http://www.smallparts.com/) 
 
    I use a 1/2" SS bearing and a large scalpel blade  'trimmed' oval with 
a carbide disk and glued to the arm with two part  acrylic adhesive. You can 
use bearings down to 1/4" OK, but mount them on the  vertical frame, NOT on 
the arm! My top suspension is an 8 thou music wire. I can  set the period 
to 60 seconds OK and it works for some days, but it has  a significant tilt 
drift. My 'normal' set period is 20 seconds. I  measured +/-2mm drift over a 
fortnight with this, in a max drift range of  +/-10mm.
 
    The two 'suspensions' which are  very likey to give trouble are the 
knife edge on a plane and a point in a  cup. The materials in contact are 
loaded close to or over the maximum allowed  stress. I advise against trying to 
use either of these types. 
 
    It may be beneficial to attach the top support ~3/4  along the arm as 
shown above. The balance between the mass and the weight of the  arm itself 
can be set to minimise the vertical load on the bottom bearing.  This 
improves the stability.
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16809" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 09/04/2009, rog@.......... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>Is a 
  scalpel blade against a steel ball bearing the current best consensus fo=
r a 
  Lehman pivot?<BR>rob<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Rob,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Crossed cylinders can be&nbsp;a bit&nbsp;bett=
er. 
The surfaces need to highly polished. The SEP uses 1/8" OD polished Tungst=
en 
Carbide needle rollers, but these may be rather expensive / difficult to=
 obtain 
depending on where you live.&nbsp;See <A 
href=3D"http://www.bgs.ac.uk/education/school_seismology/seismometer.html"=
>http://www.bgs.ac.uk/education/school_seismology/seismometer.html</A>&nbs=
p;You 
mount both the vertical rollers on the frame. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;However, a polished SS plane rolling on a SS=
 ball 
bearing&nbsp;works perfectly well and it may cost only 50 c! See <A 
href=3D"http://www.smallparts.com/">http://www.smallparts.com/</A></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I use a 1/2" SS bearing and a large scalpel=
 blade 
'trimmed' oval with a carbide disk and&nbsp;glued to the arm with two part=
 
acrylic adhesive. You can use bearings down to 1/4" OK, but mount them on=
 the 
vertical frame, NOT on the arm! My top suspension is an 8 thou music wire.=
 I can 
set the period to 60 seconds OK and it works for some days, but it has 
a&nbsp;significant tilt drift. My 'normal' set period is 20 seconds.&nbsp;=
I 
measured +/-2mm drift over a fortnight with this, in a max&nbsp;drift rang=
e of 
+/-10mm.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The two 'suspensions' which&nbsp;are 
very&nbsp;likey to give trouble are the knife edge on a plane and a point=
 in a 
cup. The materials in contact are loaded close to or over the maximum allo=
wed 
stress. I advise against trying to use either of these types. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;It may be beneficial to attach the top suppor=
t ~3/4 
along the arm as shown above. The balance between the mass and the weight=
 of the 
arm itself&nbsp;can be set to minimise the vertical load on the bottom bea=
ring. 
This improves the stability.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Re: Best Lehman pivot
From: "tchannel"  tchannel@............ 
Date: Thu, 9 Apr 2009 10:08:56 -0600

Hi Chris,  I know how the roller on roller works, but I can't find a =
picture close up of one.   Do you know of one?   I was trying to explain =
it to someone, and picture would help.

Thanks, Ted
  ----- Original Message -----=20
  From: ChrisAtUpw@..........
  To: psn-l@.................
  Sent: Thursday, April 09, 2009 9:43 AM
  Subject: Re: Best Lehman pivot


  In a message dated 09/04/2009, rog@.......... writes:
    Is a scalpel blade against a steel ball bearing the current best =
consensus for a Lehman pivot?
    rob

  Hi Rob,

      Crossed cylinders can be a bit better. The surfaces need to highly =
polished. The SEP uses 1/8" OD polished Tungsten Carbide needle rollers, =
but these may be rather expensive / difficult to obtain depending on =
where you live. See =
http://www.bgs.ac.uk/education/school_seismology/seismometer.html You =
mount both the vertical rollers on the frame.=20

      However, a polished SS plane rolling on a SS ball bearing works =
perfectly well and it may cost only 50 c! See http://www.smallparts.com/

      I use a 1/2" SS bearing and a large scalpel blade 'trimmed' oval =
with a carbide disk and glued to the arm with two part acrylic adhesive. =
You can use bearings down to 1/4" OK, but mount them on the vertical =
frame, NOT on the arm! My top suspension is an 8 thou music wire. I can =
set the period to 60 seconds OK and it works for some days, but it has a =
significant tilt drift. My 'normal' set period is 20 seconds. I measured =
+/-2mm drift over a fortnight with this, in a max drift range of =
+/-10mm.

      The two 'suspensions' which are very likey to give trouble are the =
knife edge on a plane and a point in a cup. The materials in contact are =
loaded close to or over the maximum allowed stress. I advise against =
trying to use either of these types.=20

      It may be beneficial to attach the top support ~3/4 along the arm =
as shown above. The balance between the mass and the weight of the arm =
itself can be set to minimise the vertical load on the bottom bearing. =
This improves the stability.

      Regards,

      Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18372">
<STYLE></STYLE>
</HEAD>
<BODY style=3D"FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 10pt" =
id=3Drole_body=20
bottomMargin=3D7 leftMargin=3D7 rightMargin=3D7 topMargin=3D7 =
bgColor=3D#ffffff>
<DIV>Hi Chris,&nbsp; I know how the roller on roller works, but I can't =
find a=20
picture close up of one.&nbsp;&nbsp; Do you know of one?&nbsp;&nbsp; I =
was=20
trying to explain it to someone, and picture would help.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Thanks, Ted</DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
  <A title=3DChrisAtUpw@..........
  href=3D"mailto:ChrisAtUpw@.......">ChrisAtUpw@.......</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, April 09, 2009 =
9:43=20
  AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: Best Lehman =
pivot</DIV>
  <DIV><BR></DIV><FONT id=3Drole_document color=3D#000000 size=3D2 =
face=3DArial>
  <DIV>
  <DIV>In a message dated 09/04/2009, <A=20
  href=3D"mailto:rog@..........">rog@..........</A> writes:</DIV>
  <BLOCKQUOTE=20
  style=3D"BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: =
5px"><FONT=20
    style=3D"BACKGROUND-COLOR: transparent" color=3D#000000 size=3D2 =
face=3DArial>Is a=20
    scalpel blade against a steel ball bearing the current best =
consensus for a=20
    Lehman pivot?<BR>rob<BR></FONT></BLOCKQUOTE></DIV>
  <DIV></DIV>
  <DIV>Hi Rob,</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;Crossed cylinders can be&nbsp;a =
bit&nbsp;better.=20
  The surfaces need to highly polished. The SEP uses 1/8" OD polished =
Tungsten=20
  Carbide needle rollers, but these may be rather expensive / difficult =
to=20
  obtain depending on where you live.&nbsp;See <A=20
  =
href=3D"http://www.bgs.ac.uk/education/school_seismology/seismometer.html=
">http://www.bgs.ac.uk/education/school_seismology/seismometer.html</A>&n=
bsp;You=20
  mount both the vertical rollers on the frame. </DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;However, a polished SS plane rolling on a =
SS ball=20
  bearing&nbsp;works perfectly well and it may cost only 50 c! See <A=20
  =
href=3D"http://www.smallparts.com/">http://www.smallparts.com/</A></DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;I use a 1/2" SS bearing and a large =
scalpel blade=20
  'trimmed' oval with a carbide disk and&nbsp;glued to the arm with two =
part=20
  acrylic adhesive. You can use bearings down to 1/4" OK, but mount them =
on the=20
  vertical frame, NOT on the arm! My top suspension is an 8 thou music =
wire. I=20
  can set the period to 60 seconds OK and it works for some days, but it =
has=20
  a&nbsp;significant tilt drift. My 'normal' set period is 20 =
seconds.&nbsp;I=20
  measured +/-2mm drift over a fortnight with this, in a max&nbsp;drift =
range of=20
  +/-10mm.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;The two 'suspensions' which&nbsp;are=20
  very&nbsp;likey to give trouble are the knife edge on a plane and a =
point in a=20
  cup. The materials in contact are loaded close to or over the maximum =
allowed=20
  stress. I advise against trying to use either of these types. </DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;It may be beneficial to attach the top =
support=20
  ~3/4 along the arm as shown above. The balance between the mass and =
the weight=20
  of the arm itself&nbsp;can be set to minimise the vertical load on the =
bottom=20
  bearing. This improves the stability.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris=20
Chapman</DIV></BLOCKQUOTE></FONT></BODY></HTML>

Subject: Re: Best Lehman pivot
From: ChrisAtUpw@.......
Date: Thu, 9 Apr 2009 13:22:02 EDT

 
In a message dated 09/04/2009, tchannel@............ writes:

Hi Chris,  I know how the roller on roller works, but I can't find a  
picture close up of one.   Do you know of one?   I was  trying to explain it to 
someone, and picture would  help.



Hi Ted,
 
    Sorry, but I don't personally have a photo of the  SEP bearings up 
close. And Charles hasn't included one in 
_http://www.myeclectic.info/SeismoPivots/seismopivots.htm_ 
(http://www.myeclectic.info/SeismoPivots/seismopivots.htm) 
 
    The usual setup is to mount the vertical roller in  a shallow V slot on 
the frame. The horizontal roller is mounted in a V slot on  the end of the 
arm and it is held in frictional contact by the axial load  along the arm. I 
have also used the shanks of 1/8" OD Tungsten Carbide drills.  You can also 
use hardened martensitic SS rod, but you need lap and polish  it after heat 
treatment. I glue the rods with two component acrylic  adhesive, but they 
can also be clamped.
 
    The horizontal roller simply rolls around the  vertical roller. The 
centre of rotation is the centre of the vertical roller.  The crossed 
orientation is maintained by the arm suspension.
 
    Have you looked at the SEP Manual? There are some  photos there, but 
the black painted Al frame is not helpful 
_http://www.bgs.ac.uk/education/school_seismology/seismometer.html_ 
(http://www.bgs.ac.uk/education/school_seismology/seismometer.html)  This  is the UK school seismometer.
 
    Regards,
 
    Chris
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16809" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 09/04/2009, tchannel@............ writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>
  <DIV>Hi Chris,&nbsp; I know how the roller on roller works, but I can't=
 find a 
  picture close up of one.&nbsp;&nbsp; Do you know of one?&nbsp;&nbsp; I=
 was 
  trying to explain it to someone, and picture would 
help.</DIV></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Ted,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Sorry, but I don't personally have a photo of=
 the 
SEP bearings up close. And Charles hasn't included one in <A 
href=3D"http://www.myeclectic.info/SeismoPivots/seismopivots.htm">http://w=
ww.myeclectic.info/SeismoPivots/seismopivots.htm</A></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The usual setup is to mount the vertical roll=
er in 
a shallow V slot on the frame. The horizontal roller is mounted in a V slo=
t on 
the end of the arm and it&nbsp;is held in frictional contact by the axial=
 load 
along the arm. I have also used the shanks of 1/8" OD Tungsten Carbide dri=
lls. 
You can also use hardened martensitic SS rod, but&nbsp;you need lap and po=
lish 
it after heat treatment.&nbsp;I glue the rods with two component acrylic=
 
adhesive, but they can also be clamped.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The horizontal roller simply rolls around the=
 
vertical roller. The centre of rotation is the centre of the vertical roll=
er. 
The crossed orientation is maintained by the arm suspension.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Have you looked at the SEP Manual? There are=
 some 
photos there, but the black painted Al frame is not helpful <A 
href=3D"http://www.bgs.ac.uk/education/school_seismology/seismometer.html"=
>http://www.bgs.ac.uk/education/school_seismology/seismometer.html</A>&nbs=
p;This 
is the UK school seismometer.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris</DIV></FONT></BODY></HTML>

Subject: Re: Best Lehman pivot
From: ChrisAtUpw@.......
Date: Thu, 9 Apr 2009 17:22:24 EDT

 
In a message dated 09/04/2009, tchannel@............ writes:


 
Hi Ted,
    
    Sorry, wrong reference!  
Have you looked at the SEP Manual? There are some  photos there, but the 
black painted Al frame is not helpful  
_http://www.mutr.co.uk/images/Seismometer.pdf_ (http://www.mutr.co.uk/images/Seismometer.pdf)    This is the UK 
school seismometer.
 
    Regards,
 
    Chris

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16809" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 09/04/2009, tchannel@............ writes:</DIV></D=
IV>
<DIV></DIV>
<DIV>&nbsp;</DIV>
<DIV>Hi Ted,</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Sorry, wrong reference! 
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Have you looked at the SEP Manual? There are=
 some 
photos there, but the black painted Al frame is not helpful&nbsp;&nbsp;<A=
 
href=3D"http://www.mutr.co.uk/images/Seismometer.pdf">http://www.mutr.co.u=
k/images/Seismometer.pdf</A>&nbsp; 
This is the UK school seismometer.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris</DIV></DIV></FONT></BODY></HTML>

Subject: Re: Best Lehman pivot
From: "tchannel"  tchannel@............ 
Date: Thu, 9 Apr 2009 17:26:37 -0600

Yes, perfect....this is what I was looking for.  Thanks very much.
Ted
  ----- Original Message -----=20
  From: ChrisAtUpw@..........
  To: psn-l@.................
  Sent: Thursday, April 09, 2009 3:22 PM
  Subject: Re: Best Lehman pivot


  In a message dated 09/04/2009, tchannel@............ writes:

  Hi Ted,
     =20
      Sorry, wrong reference!=20
      Have you looked at the SEP Manual? There are some photos there, =
but the black painted Al frame is not helpful  =
http://www.mutr.co.uk/images/Seismometer.pdf  This is the UK school =
seismometer.

      Regards,

      Chris
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18372">
<STYLE></STYLE>
</HEAD>
<BODY style=3D"FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 10pt" =
id=3Drole_body=20
bottomMargin=3D7 leftMargin=3D7 rightMargin=3D7 topMargin=3D7 =
bgColor=3D#ffffff>
<DIV>Yes, perfect....this is what I was looking for.&nbsp; Thanks very=20
much.</DIV>
<DIV>Ted</DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
  <A title=3DChrisAtUpw@..........
  href=3D"mailto:ChrisAtUpw@.......">ChrisAtUpw@.......</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, April 09, 2009 =
3:22=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: Best Lehman =
pivot</DIV>
  <DIV><BR></DIV><FONT id=3Drole_document color=3D#000000 size=3D2 =
face=3DArial>
  <DIV>
  <DIV>In a message dated 09/04/2009, <A=20
  href=3D"mailto:tchannel@............">tchannel@............</A>=20
  writes:</DIV></DIV>
  <DIV></DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Hi Ted,</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;Sorry, wrong reference!=20
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;Have you looked at the SEP Manual? There =
are some=20
  photos there, but the black painted Al frame is not =
helpful&nbsp;&nbsp;<A=20
  =
href=3D"http://www.mutr.co.uk/images/Seismometer.pdf">http://www.mutr.co.=
uk/images/Seismometer.pdf</A>&nbsp;=20
  This is the UK school seismometer.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
  <DIV>&nbsp;</DIV>
  =
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris</DIV></DIV></BLOCKQUOTE></FONT></BODY>=
</HTML>

Subject: Re: Best Lehman pivot
From: Dave Nelson  dave.nelson@............... 
Date: Fri, 10 Apr 2009 09:32:08 +1000

<html>
Hi Chris,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
wow&nbsp; thats gotta be the best article with good pics I have so far
<br>
seen on the net for a seismometer design !!!<br><br>
&nbsp;&nbsp; thanks for digging that one up and posting it. Since moving
to Australia I<br>
still havent got a seismo system built up&nbsp; mainly due to the need to
build a <br>
Lehman style seismo.&nbsp;&nbsp; this is going to help lots.&nbsp;&nbsp;
Nice to have that cm scale<br>
on the boom&nbsp; it will help to scale the whole unit.<br>
Im sure others will also find it helpful.&nbsp;&nbsp; <br><br>
cheers<br>
Dave N<br>
Sydney<br><br>
<br><br>
At 05:22 PM 4/9/2009 -0400, you wrote:<br>
<blockquote type=cite class=cite cite><font face="arial" size=2>&nbsp;&nbsp;&nbsp;
Have you looked at the SEP Manual? There are some photos there, but the
black painted Al frame is not helpful&nbsp;
<a href="http://www.mutr.co.uk/images/Seismometer.pdf">http://www.mutr.co.uk/images/Seismometer.pdf</a>&nbsp;
This is the UK school seismometer.<br>
&nbsp;&nbsp;&nbsp; Regards,<br>
&nbsp;&nbsp;&nbsp; Chris</font></blockquote></html>


Subject: Re: Best Lehman pivot
From: "Robert O. Green"  rog@.......... 
Date: Thu, 09 Apr 2009 20:23:48 -0700

Chris,

Thank you kindly for your advice.  Do you have pictures of your set up 
pivot and top suspension?

Rob

ChrisAtUpw@....... wrote:
> In a message dated 09/04/2009, rog@.......... writes:
>
>     Is a scalpel blade against a steel ball bearing the current best
>     consensus for a Lehman pivot?
>     rob
>
> Hi Rob,
>     Crossed cylinders can be a bit better. The surfaces need to highly 
> polished. The SEP uses 1/8" OD polished Tungsten Carbide needle 
> rollers, but these may be rather expensive / difficult to obtain 
> depending on where you live. See 
> http://www.bgs.ac.uk/education/school_seismology/seismometer.html You 
> mount both the vertical rollers on the frame.
>     However, a polished SS plane rolling on a SS ball bearing works 
> perfectly well and it may cost only 50 c! See http://www.smallparts.com/
>     I use a 1/2" SS bearing and a large scalpel blade 'trimmed' oval 
> with a carbide disk and glued to the arm with two part acrylic 
> adhesive. You can use bearings down to 1/4" OK, but mount them on the 
> vertical frame, NOT on the arm! My top suspension is an 8 thou music 
> wire. I can set the period to 60 seconds OK and it works for some 
> days, but it has a significant tilt drift. My 'normal' set period is 
> 20 seconds. I measured +/-2mm drift over a fortnight with this, in a 
> max drift range of +/-10mm.
>     The two 'suspensions' which are very likey to give trouble are the 
> knife edge on a plane and a point in a cup. The materials in contact 
> are loaded close to or over the maximum allowed stress. I advise 
> against trying to use either of these types.
>     It may be beneficial to attach the top support ~3/4 along the arm 
> as shown above. The balance between the mass and the weight of the arm 
> itself can be set to minimise the vertical load on the bottom bearing. 
> This improves the stability.
>     Regards,
>     Chris Chapman
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com
> Version: 8.0.176 / Virus Database: 270.11.48/2048 - Release Date: 4/8/2009 7:02 PM
>
>   


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Subject: Re: Best Lehman pivot
From: "Robert O. Green"  rog@.......... 
Date: Fri, 10 Apr 2009 07:44:29 -0700

Chris,

Thank you for the links and your paper on pivot research.   They are 
very informative.

Rob

ChrisAtUpw@....... wrote:
> In a message dated 09/04/2009, tchannel@............ writes:
> Hi Ted,
>     Sorry, wrong reference!
>     Have you looked at the SEP Manual? There are some photos there, 
> but the black painted Al frame is not helpful 
> http://www.mutr.co.uk/images/Seismometer.pdf  This is the UK school 
> seismometer.
>     Regards,
>     Chris
> ------------------------------------------------------------------------
>
>
> No virus found in this incoming message.
> Checked by AVG - http://www.avg.com
> Version: 8.0.176 / Virus Database: 270.11.48/2048 - Release Date: 4/8/2009 7:02 PM
>
>   

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: How to adapt comercial sensors and seismograph?
From: Antonio Moura  geopresp@......... 
Date: Wed, 15 Apr 2009 01:06:37 +0100

I recently bought the following sensors: Kinemetrics SS-1, an SV,1 an SH1 a
SensonicsSP3, Geotech-s-500 and a Guralp CMG-3V. Being an applied geophysics
guy I thought these worked like geophones and without power and thus relying
on data logger to amplify. Would anyone know how the Webtronics or
Infiltec acquisition  boards and home-made setups (National Instruments)
could be adapted for these sensors? I need to power the sensors I supose?
How?
And does anyone know anything about ERA PRS-4 Scintrex 4 channel
seismographs? Can they read signals from any of these sensors.Best regards

Rui
<div>I recently bought the following sensors: Kinemetrics SS-1, an SV,1 an =
SH1 a SensonicsSP3, Geotech-s-500 and a Guralp CMG-3V. Being an applied geo=
physics guy I thought these worked like geophones and without power and thu=
s relying on data logger to amplify. Would=A0anyone=A0know how=A0the=A0Webt=
ronics or Infiltec=A0acquisition=A0 boards and home-made setups=A0(National=
 Instruments) could be adapted for these sensors? I need to power the=A0sen=
sors I supose? How? </div>

<div>And does anyone know anything about=A0ERA PRS-4 Scintrex 4 channel sei=
smographs?=A0Can they=A0read signals from any of these sensors.Best regards=
<br>=A0<br>Rui </div>

Subject: GPS problems
From: Paul  elegant_dice@......... 
Date: Wed, 15 Apr 2009 08:37:15 +0800

Hi all,

I have a couple of Larry's digitizers + GPS set up, and I am having a
problem where the GPS seems to lose the lock after a random amount of
time.   Days, weeks, sometimes months.     When it happens, it will not
regain the lock.

I have tried doing the GPS reset via the WinSDR menu, but that doesn't work.

Eventually I unplug the GPS (or the digitiser's power), and plug it back in
again, and it starts working again until it loses the lock the next time.

Does anyone else suffer from this problem?

thanks,
Paul
Hi all,<br><br>I have a couple of Larry&#39;s digitizers + GPS set up, and =
I am having a problem where the GPS seems to lose the lock after a random a=
mount of time.=C2=A0=C2=A0 Days, weeks, sometimes months.=C2=A0=C2=A0=C2=A0=
=C2=A0 When it happens, it will not regain the lock.<br>

<br>I have tried doing the GPS reset via the WinSDR menu, but that doesn&#3=
9;t work.<br><br>Eventually I unplug the GPS (or the digitiser&#39;s power)=
, and plug it back in again, and it starts working again until it loses the=
 lock the next time.<br>

<br>Does anyone else suffer from this problem?<br><br>thanks,<br>Paul<br><b=
r>

Subject: AD converter with AmaSeis
From: "tchannel"  tchannel@............ 
Date: Tue, 14 Apr 2009 18:46:22 -0600

Hi Folks,=20

I have never use anything but DATAQ194 ad converter with AmaSeis.   On =
the pull down menu Amaseis/Setting/Devices there are seven different ad =
converters.   Has anyone use other ad converter with AmaSeis?

I would guess others would work, but AmaSeis requires you choose one of =
the seven.   Which one would you choose, if the one you are using is not =
on the list?

Thanks, Ted
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18372">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>Hi Folks, </FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>I have never use anything but DATAQ194 =
ad converter=20
with AmaSeis.&nbsp;&nbsp; On the pull down menu Amaseis/Setting/Devices =
there=20
are seven different ad converters.&nbsp;&nbsp; Has anyone use other ad =
converter=20
with AmaSeis?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>I would guess others would work, but =
AmaSeis=20
requires you choose one of the seven.&nbsp;&nbsp; Which one would you =
choose, if=20
the one you are using is not on the list?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Thanks, Ted</FONT></DIV></BODY></HTML>

Subject: Re: AD converter with AmaSeis
From: ChrisAtUpw@.......
Date: Tue, 14 Apr 2009 21:13:19 EDT

In a message dated 15/04/2009, tchannel@............ writes:

Has anyone use other ad converter with  AmaSeis?

Hi Ted,
 
    Yes, their old 12 bit DI-154RS ADCs.
 
    I would guess others  would work, but AmaSeis requires you choose one 
of the seven.  Which one  would you choose, if the one you are using is not 
on the  list?

 
    The DI-194 is only 10 bit, which is marginal for  seismic recording.
    The DI-158U is 12 bit - about the minimum  practical.
    Note that the very expensive Dataq ADCs are only 14  bit. Dataq don't 
seem to know anything about signal averaging.
 
    AmaSeis only accepts up to 16 bit signals, in ASCII  decimal characters.
 
    AmaSeis requires an input and control  interface program - only those 
on the list will work. 
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16809" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>In a message dated 15/04/2009, tchannel@............ writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>
  <DIV><FONT face=3DArial size=3D2>Has anyone use other ad converter with=
 
  AmaSeis?</FONT></FONT></DIV></BLOCKQUOTE>
<DIV>Hi Ted,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Yes, their old 12 bit DI-154RS ADCs.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;<FONT style=3D"BACKGROUND-COLOR: transparent"=
 
face=3DArial color=3D#000000 size=3D2><FONT face=3DArial size=3D2>I would=
 guess others 
would work, but AmaSeis requires you choose one of the seven. &nbsp;Which=
 one 
would you choose, if the one you are using is not on the 
list?</FONT></DIV></FONT>
<DIV></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The DI-194 is only 10 bit, which is marginal=
 for 
seismic recording.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The DI-158U is 12 bit - about the minimum 
practical.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Note that the very expensive Dataq ADCs are=
 only 14 
bit. Dataq don't seem to know anything about signal averaging.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;AmaSeis only accepts up to 16 bit signals, in=
 ASCII 
decimal characters.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;AmaSeis requires an input and control 
interface&nbsp;program - only those on the list will work.&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Re: GPS problems
From: Thomas Dick  dickthomas01@............. 
Date: Tue, 14 Apr 2009 22:38:51 -0500

Paul wrote:
> Hi all,
>
> I have a couple of Larry's digitizers + GPS set up, and I am having a 
> problem where the GPS seems to lose the lock after a random amount of 
> time.   Days, weeks, sometimes months.     When it happens, it will 
> not regain the lock.
>
> I have tried doing the GPS reset via the WinSDR menu, but that doesn't 
> work.
>
> Eventually I unplug the GPS (or the digitiser's power), and plug it 
> back in again, and it starts working again until it loses the lock the 
> next time.
>
> Does anyone else suffer from this problem?
>
> thanks,
> Paul
>
I regularly lose lock for up to four for five hours at a time in the 
winter months but it does relock. Could this be a weak signal for your 
site? Maybe a better antenna position would help.
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Public Seismic Network Mailing List (PSN-L)


Subject: Re: AD converter with AmaSeis
From: "David Saum"  DSaum@............ 
Date: Wed, 15 Apr 2009 11:00:48 -0400


> Subject: AD converter with AmaSeis
> From:    "tchannel" <tchannel@............>
> Date:    Tue, 14 Apr 2009 18:46:22 -0600
> 
> 
> Hi Folks,
> 
> I have never use anything but DATAQ194 ad converter with AmaSeis.
> the pull down menu Amaseis/Setting/Devices there are seven different ad 
> converters.   Has anyone use other ad converter with AmaSeis?

Alan Jones, the author of Amaseis, will add most any
ad converter that you need.

For instance, he added mine with the following format

Amaseis Device=INFILTECQM1
16 bits
ASCII characters
range +32765 to -32765 and 0 mean
each ASCII record terminated with LF(10) and CR(13)
variable samples per second, default 16 sps
 
Dave
http://www.infiltec.com/seismo

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Public Seismic Network Mailing List (PSN-L)


Subject: RE: GPS problems
From: "Gary Lindgren"  gel@................. 
Date: Wed, 15 Apr 2009 10:46:51 -0700

Paul,

I also have had some WinSDR errors. It seemed that the GPS was losing =
lock when viewing the log file. But WinSDR always reported in Lock. I =
use the FTP feature to send the response to my web site and I was =
getting an FTP error Bad Make Directory. I would just restart WinSDR and =
all was OK. The last change I made was to plug Larry=E2=80=99s digitizer =
into a surge suppressor. I think only think this may have helped. =
I=E2=80=99ve not seen any errors for 5 days now. You want try it. Let us =
know if it helps.

Gary

=20

=20

=20

=20

From: psn-l-request@.............. [mailto:psn-l-request@............... =
On Behalf Of Paul
Sent: Tuesday, April 14, 2009 5:37 PM
To: psn-l@..............
Subject: GPS problems

=20

Hi all,

I have a couple of Larry's digitizers + GPS set up, and I am having a =
problem where the GPS seems to lose the lock after a random amount of =
time.   Days, weeks, sometimes months.     When it happens, it will not =
regain the lock.

I have tried doing the GPS reset via the WinSDR menu, but that doesn't =
work.

Eventually I unplug the GPS (or the digitiser's power), and plug it back =
in again, and it starts working again until it loses the lock the next =
time.

Does anyone else suffer from this problem?

thanks,
Paul

<html xmlns:v=3D"urn:schemas-microsoft-com:vml" =
xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml" =
xmlns=3D"http://www.w3.org/TR/REC-html40">

<head>
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<body lang=3DEN-US link=3Dblue vlink=3Dpurple>

<div class=3DSection1>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Paul,<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>I also have had some WinSDR errors. It seemed that the =
GPS was
losing lock when viewing the log file. But WinSDR always reported in =
Lock. I
use the FTP feature to send the response to my web site and I was =
getting an
FTP error <b>Bad Make Directory</b>. I would just restart WinSDR and all =
was
OK. The last change I made was to plug Larry=E2=80=99s digitizer into a =
surge
suppressor. I think only think this may have helped. I=E2=80=99ve not =
seen any errors
for 5 days now. You want try it. Let us know if it =
helps.<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Gary<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in'>

<p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
psn-l-request@.............. [mailto:psn-l-request@............... <b>On =
Behalf
Of </b>Paul<br>
<b>Sent:</b> Tuesday, April 14, 2009 5:37 PM<br>
<b>To:</b> psn-l@..............<br>
<b>Subject:</b> GPS problems<o:p></o:p></span></p>

</div>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal style=3D'margin-bottom:12.0pt'>Hi all,<br>
<br>
I have a couple of Larry's digitizers + GPS set up, and I am having a =
problem
where the GPS seems to lose the lock after a random amount of =
time.&nbsp;&nbsp;
Days, weeks, sometimes months.&nbsp;&nbsp;&nbsp;&nbsp; When it happens, =
it will
not regain the lock.<br>
<br>
I have tried doing the GPS reset via the WinSDR menu, but that doesn't =
work.<br>
<br>
Eventually I unplug the GPS (or the digitiser's power), and plug it back =
in
again, and it starts working again until it loses the lock the next =
time.<br>
<br>
Does anyone else suffer from this problem?<br>
<br>
thanks,<br>
Paul<o:p></o:p></p>

</div>

</body>

</html>

Subject: RE: Changes to my Lehman sensor
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Wed, 15 Apr 2009 18:20:21 +0000

Hi

Here are pictures of the latest changes to my lehman sensor. One of the
change is that the top now has a hindge to make it more movable. In
theory that should provide me with better frequancy. However. I
continune to get the peak at 0.6Hz, even with thoise changes. The damper
plate is now aluminum, not steel.

I am not sure how well this works until I get a earthquake close to
Iceland or some where in the world.

Pictures.

http://www.jonfr.com/myndir/v/geology/seismometer/p4150001b.jpg.html

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: RE: Changes to my Lehman sensor
From: "Fikke, Audun"  Audun.Fikke@......... 
Date: Wed, 15 Apr 2009 23:43:31 +0200

J=F3n,

I have made a few attempts to make a working Lehman. I never finished a =
stable version, but I did record some quakes with a mockup based on the =
'plumbers approach'. Lack of time and poor workshop facilities was the =
reason my project stranded.
So I ended up buying the SEP model which I'm very pleased with.
Your system looks alright to me, but I can't see from your pictures how =
your pivot points are working. Could you please describe in detail how =
the boom and support are in contact with the frame?=20

As I'm writing an Indonesian M6,6 is rocking my SEP. Feel free to visit =
my heliplots from Norway http://vindkast.no/wx_seismo.php

regards
Audun




-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On Behalf Of J=F3n Fr=EDmann
Sent: 15. april 2009 20:20
To: psn-l@..............
Subject: RE: Changes to my Lehman sensor

Hi

Here are pictures of the latest changes to my lehman sensor. One of the =
change is that the top now has a hindge to make it more movable. In =
theory that should provide me with better frequancy. However. I =
continune to get the peak at 0.6Hz, even with thoise changes. The damper =
plate is now aluminum, not steel.

I am not sure how well this works until I get a earthquake close to =
Iceland or some where in the world.

Pictures.

http://www.jonfr.com/myndir/v/geology/seismometer/p4150001b.jpg.html

Regards.
--
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: RE: Changes to my Lehman sensor
From: "Gary Lindgren"  gel@................. 
Date: Wed, 15 Apr 2009 15:53:16 -0700

Jon,
What is the period length of your Lehman sensor. Were you able to =
measure
how long it takes for the boom displacement to drop by 1/2 after giving =
it a
light touch and this would be without damping in place.
Gary




-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Wednesday, April 15, 2009 11:20 AM
To: psn-l@..............
Subject: RE: Changes to my Lehman sensor

Hi

Here are pictures of the latest changes to my lehman sensor. One of the
change is that the top now has a hindge to make it more movable. In
theory that should provide me with better frequancy. However. I
continune to get the peak at 0.6Hz, even with thoise changes. The damper
plate is now aluminum, not steel.

I am not sure how well this works until I get a earthquake close to
Iceland or some where in the world.

Pictures.

http://www.jonfr.com/myndir/v/geology/seismometer/p4150001b.jpg.html

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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Subject: RE: Changes to my Lehman sensor
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Wed, 15 Apr 2009 23:26:28 +0000

Hi

There is a peak around 0.6Hz, it might be the sensor it self that peaks
like that. But it might also be natrual forces in my area that create
this peak. I am not sure yet what natrual frequancy of the sensor is.

Regards.
J=F3n Fr=EDmann.

On mi=F0, 2009-04-15 at 15:53 -0700, Gary Lindgren wrote:
> Jon,
> What is the period length of your Lehman sensor. Were you able to measure
> how long it takes for the boom displacement to drop by 1/2 after giving i=
t a
> light touch and this would be without damping in place.
> Gary
>=20
>=20
>=20
>=20
> -----Original Message-----
> From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
> Behalf Of J=F3n Fr=EDmann
> Sent: Wednesday, April 15, 2009 11:20 AM
> To: psn-l@..............
> Subject: RE: Changes to my Lehman sensor
>=20
> Hi
>=20
> Here are pictures of the latest changes to my lehman sensor. One of the
> change is that the top now has a hindge to make it more movable. In
> theory that should provide me with better frequancy. However. I
> continune to get the peak at 0.6Hz, even with thoise changes. The damper
> plate is now aluminum, not steel.
>=20
> I am not sure how well this works until I get a earthquake close to
> Iceland or some where in the world.
>=20
> Pictures.
>=20
> http://www.jonfr.com/myndir/v/geology/seismometer/p4150001b.jpg.html
>=20
> Regards.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: RE: Changes to my Lehman sensor
From: "Fikke, Audun"  Audun.Fikke@......... 
Date: Thu, 16 Apr 2009 01:42:05 +0200

J=F3n
This manual explains how to set the natural frequency and also the =
dampening of a Lehman.
http://www.mutr.co.uk/images/Seismometer.pdf=20

regards
Audun
http://vindkast.no/wx_seismo

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On Behalf Of J=F3n Fr=EDmann
Sent: 16. april 2009 01:26
To: psn-l@..............
Subject: RE: Changes to my Lehman sensor

Hi

There is a peak around 0.6Hz, it might be the sensor it self that peaks =
like that. But it might also be natrual forces in my area that create =
this peak. I am not sure yet what natrual frequancy of the sensor is.

Regards.
J=F3n Fr=EDmann.

On mi=F0, 2009-04-15 at 15:53 -0700, Gary Lindgren wrote:
> Jon,
> What is the period length of your Lehman sensor. Were you able to=20
> measure how long it takes for the boom displacement to drop by 1/2=20
> after giving it a light touch and this would be without damping in =
place.
> Gary
>=20
>=20
>=20
>=20
> -----Original Message-----
> From: psn-l-request@.................
> [mailto:psn-l-request@............... On Behalf Of J=F3n Fr=EDmann
> Sent: Wednesday, April 15, 2009 11:20 AM
> To: psn-l@..............
> Subject: RE: Changes to my Lehman sensor
>=20
> Hi
>=20
> Here are pictures of the latest changes to my lehman sensor. One of=20
> the change is that the top now has a hindge to make it more movable.=20
> In theory that should provide me with better frequancy. However. I=20
> continune to get the peak at 0.6Hz, even with thoise changes. The=20
> damper plate is now aluminum, not steel.
>=20
> I am not sure how well this works until I get a earthquake close to=20
> Iceland or some where in the world.
>=20
> Pictures.
>=20
> http://www.jonfr.com/myndir/v/geology/seismometer/p4150001b.jpg.html
>=20
> Regards.

__________________________________________________________

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Subject: RE: Changes to my Lehman sensor
From: "Gary Lindgren"  gel@................. 
Date: Wed, 15 Apr 2009 16:44:15 -0700

Jon,
Without damping give the boom a light touch, what is the natural period.
Count how many seconds it takes to make one cycle. Then count how long =
it
takes for the displacement to go from one centimeter to 1/2 centimeter. =
This
will tell you how much friction you have in your sensor.
Gary




-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Wednesday, April 15, 2009 4:26 PM
To: psn-l@..............
Subject: RE: Changes to my Lehman sensor

Hi

There is a peak around 0.6Hz, it might be the sensor it self that peaks
like that. But it might also be natrual forces in my area that create
this peak. I am not sure yet what natrual frequancy of the sensor is.

Regards.
J=F3n Fr=EDmann.

On mi=F0, 2009-04-15 at 15:53 -0700, Gary Lindgren wrote:
> Jon,
> What is the period length of your Lehman sensor. Were you able to =
measure
> how long it takes for the boom displacement to drop by 1/2 after =
giving it
a
> light touch and this would be without damping in place.
> Gary
>=20
>=20
>=20
>=20
> -----Original Message-----
> From: psn-l-request@.............. =
[mailto:psn-l-request@...............
On
> Behalf Of J=F3n Fr=EDmann
> Sent: Wednesday, April 15, 2009 11:20 AM
> To: psn-l@..............
> Subject: RE: Changes to my Lehman sensor
>=20
> Hi
>=20
> Here are pictures of the latest changes to my lehman sensor. One of =
the
> change is that the top now has a hindge to make it more movable. In
> theory that should provide me with better frequancy. However. I
> continune to get the peak at 0.6Hz, even with thoise changes. The =
damper
> plate is now aluminum, not steel.
>=20
> I am not sure how well this works until I get a earthquake close to
> Iceland or some where in the world.
>=20
> Pictures.
>=20
> http://www.jonfr.com/myndir/v/geology/seismometer/p4150001b.jpg.html
>=20
> Regards.

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Subject: RE: Changes to my Lehman sensor
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Thu, 16 Apr 2009 01:14:52 +0000

Hi

I did manage to get the Hz number down to 0.4Hz. I guess that I need to
rase the arm up a little. I am going to do that tomorrow.

Regards.
J=F3n Fr=EDmann.

On mi=F0, 2009-04-15 at 16:44 -0700, Gary Lindgren wrote:
> Jon,
> Without damping give the boom a light touch, what is the natural period.
> Count how many seconds it takes to make one cycle. Then count how long it
> takes for the displacement to go from one centimeter to 1/2 centimeter. T=
his
> will tell you how much friction you have in your sensor.
> Gary
>=20
>=20
>=20
>=20
> -----Original Message-----
> From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
> Behalf Of J=F3n Fr=EDmann
> Sent: Wednesday, April 15, 2009 4:26 PM
> To: psn-l@..............
> Subject: RE: Changes to my Lehman sensor
>=20
> Hi
>=20
> There is a peak around 0.6Hz, it might be the sensor it self that peaks
> like that. But it might also be natrual forces in my area that create
> this peak. I am not sure yet what natrual frequancy of the sensor is.
>=20
> Regards.
> J=F3n Fr=EDmann.
>=20
> On mi=F0, 2009-04-15 at 15:53 -0700, Gary Lindgren wrote:
> > Jon,
> > What is the period length of your Lehman sensor. Were you able to measu=
re
> > how long it takes for the boom displacement to drop by 1/2 after giving=
 it
> a
> > light touch and this would be without damping in place.
> > Gary
> >=20
> >=20
> >=20
> >=20
> > -----Original Message-----
> > From: psn-l-request@.............. [mailto:psn-l-request@...............
]
> On
> > Behalf Of J=F3n Fr=EDmann
> > Sent: Wednesday, April 15, 2009 11:20 AM
> > To: psn-l@..............
> > Subject: RE: Changes to my Lehman sensor
> >=20
> > Hi
> >=20
> > Here are pictures of the latest changes to my lehman sensor. One of the
> > change is that the top now has a hindge to make it more movable. In
> > theory that should provide me with better frequancy. However. I
> > continune to get the peak at 0.6Hz, even with thoise changes. The dampe=
r
> > plate is now aluminum, not steel.
> >=20
> > I am not sure how well this works until I get a earthquake close to
> > Iceland or some where in the world.
> >=20
> > Pictures.
> >=20
> > http://www.jonfr.com/myndir/v/geology/seismometer/p4150001b.jpg.html
> >=20
> > Regards.
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.

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Subject: Lehman sensor friction
From: "Robert O. Green"  rog@.......... 
Date: Sat, 18 Apr 2009 08:26:50 -0700

Gary,

I am curious.

What are typical times for Lehman half-life decay?

What are the main causes  of decay?

Rob

Gary Lindgren wrote:
> Jon,
> Without damping give the boom a light touch, what is the natural period.
> Count how many seconds it takes to make one cycle. Then count how long it
> takes for the displacement to go from one centimeter to 1/2 centimeter. This
> will tell you how much friction you have in your sensor.
> Gary
>
>
>
>
> -----Original Message-----
> From: psn-l-request@.............. [mailto:psn-l-request@............... On
> Behalf Of Jón Frímann
> Sent: Wednesday, April 15, 2009 4:26 PM
> To: psn-l@..............
> Subject: RE: Changes to my Lehman sensor
>
> Hi
>
> There is a peak around 0.6Hz, it might be the sensor it self that peaks
> like that. But it might also be natrual forces in my area that create
> this peak. I am not sure yet what natrual frequancy of the sensor is.
>
> Regards.
> Jón Frímann.
>
> On mið, 2009-04-15 at 15:53 -0700, Gary Lindgren wrote:
>   
>> Jon,
>> What is the period length of your Lehman sensor. Were you able to measure
>> how long it takes for the boom displacement to drop by 1/2 after giving it
>>     
> a
>   
>> light touch and this would be without damping in place.
>> Gary
>>
>>
>>
>>
>> -----Original Message-----
>> From: psn-l-request@.............. [mailto:psn-l-request@...............
>>     
> On
>   
>> Behalf Of Jón Frímann
>> Sent: Wednesday, April 15, 2009 11:20 AM
>> To: psn-l@..............
>> Subject: RE: Changes to my Lehman sensor
>>
>> Hi
>>
>> Here are pictures of the latest changes to my lehman sensor. One of the
>> change is that the top now has a hindge to make it more movable. In
>> theory that should provide me with better frequancy. However. I
>> continune to get the peak at 0.6Hz, even with thoise changes. The damper
>> plate is now aluminum, not steel.
>>
>> I am not sure how well this works until I get a earthquake close to
>> Iceland or some where in the world.
>>
>> Pictures.
>>
>> http://www.jonfr.com/myndir/v/geology/seismometer/p4150001b.jpg.html
>>
>> Regards.
>>     
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
> ------------------------------------------------------------------------
>
>
> Internal Virus Database is out of date.
> Checked by AVG - http://www.avg.com
> Version: 8.0.176 / Virus Database: 270.11.48/2048 - Release Date: 4/8/2009 7:02 PM
>
>   

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Subject: Re: Lehman sensor friction
From: Brett Nordgren  brett3nt@............. 
Date: Sat, 18 Apr 2009 12:22:45 -0400

Rob,

One source of undamped decay that isn't much talked about is how rigid is 
the support for the top wire connection.  Much energy can be absorbed by 
microscopic swaying of the support.  Similarly, if the base is mounted on 
something less rigid than bedrock, energy might be getting absorbed by the 
mounting surface.  Air damping is a small effect, but it could be a 
factor.  And, of course, there is pivot quality, which has already been 
much discussed.  Also, if you have a coil on the boom, it should be 
open-circuited to avoid losses due to interaction with the local magnetic 
field.

Once you have minimized all those effects, you will then want to add back a 
good amount of well behaved damping such as with Chris' magnetic 
array.  You probably don't want your Lehman to just respond to one 
frequency, but would prefer it to have a range of frequencies which it will 
respond to.  That is what you will get when you use relatively strong 
damping.  Reduced sensitivity = increased band width.

Brett

At 08:26 AM 4/18/2009 -0700, you wrote:
>Gary,
>
>I am curious.
>
>What are typical times for Lehman half-life decay?
>
>What are the main causes  of decay?
>
>Rob


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Public Seismic Network Mailing List (PSN-L)


Subject: RE: Lehman sensor friction
From: "Gary Lindgren"  gel@................. 
Date: Sat, 18 Apr 2009 09:37:59 -0700

Robert,
Looking at my Lehman notes, with polished tungsten carbide rods and with =
a
silicon carbide ball bearing I recorded going from 1.2" to .25" took 300
seconds. That calculates to 132 seconds for the half-life decay. I use =
the
equation Y=3DA*e-t/T where Y is the beam max. movement, A is a constant, =
t is
time in seconds, and T is the time constant of the system. I recall that
Chris Chapman said this was not quite the correct equation, but I'm sure =
it
is fairly close to describe the max. deviation with time.
Gary





-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of Robert O. Green
Sent: Saturday, April 18, 2009 8:27 AM
To: psn-l@..............
Subject: Lehman sensor friction

Gary,

I am curious.

What are typical times for Lehman half-life decay?

What are the main causes  of decay?

Rob

Gary Lindgren wrote:
> Jon,
> Without damping give the boom a light touch, what is the natural =
period.
> Count how many seconds it takes to make one cycle. Then count how long =
it
> takes for the displacement to go from one centimeter to 1/2 =
centimeter.
This
> will tell you how much friction you have in your sensor.
> Gary
>
>
>
>
> -----Original Message-----
> From: psn-l-request@.............. =
[mailto:psn-l-request@...............
On
> Behalf Of J=F3n Fr=EDmann
> Sent: Wednesday, April 15, 2009 4:26 PM
> To: psn-l@..............
> Subject: RE: Changes to my Lehman sensor
>
> Hi
>
> There is a peak around 0.6Hz, it might be the sensor it self that =
peaks
> like that. But it might also be natrual forces in my area that create
> this peak. I am not sure yet what natrual frequancy of the sensor is.
>
> Regards.
> J=F3n Fr=EDmann.
>
> On mi=F0, 2009-04-15 at 15:53 -0700, Gary Lindgren wrote:
>  =20
>> Jon,
>> What is the period length of your Lehman sensor. Were you able to =
measure
>> how long it takes for the boom displacement to drop by 1/2 after =
giving
it
>>    =20
> a
>  =20
>> light touch and this would be without damping in place.
>> Gary
>>
>>
>>
>>
>> -----Original Message-----
>> From: psn-l-request@.............. =
[mailto:psn-l-request@...............
>>    =20
> On
>  =20
>> Behalf Of J=F3n Fr=EDmann
>> Sent: Wednesday, April 15, 2009 11:20 AM
>> To: psn-l@..............
>> Subject: RE: Changes to my Lehman sensor
>>
>> Hi
>>
>> Here are pictures of the latest changes to my lehman sensor. One of =
the
>> change is that the top now has a hindge to make it more movable. In
>> theory that should provide me with better frequancy. However. I
>> continune to get the peak at 0.6Hz, even with thoise changes. The =
damper
>> plate is now aluminum, not steel.
>>
>> I am not sure how well this works until I get a earthquake close to
>> Iceland or some where in the world.
>>
>> Pictures.
>>
>> http://www.jonfr.com/myndir/v/geology/seismometer/p4150001b.jpg.html
>>
>> Regards.
>>    =20
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
> =
------------------------------------------------------------------------
>
>
> Internal Virus Database is out of date.
> Checked by AVG - http://www.avg.com
> Version: 8.0.176 / Virus Database: 270.11.48/2048 - Release Date: =
4/8/2009
7:02 PM
>
>  =20

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Subject: Re: Lehman sensor friction
From: ChrisAtUpw@.......
Date: Sat, 18 Apr 2009 19:20:06 EDT

 
In a message dated 18/04/2009, rog@.......... writes:

Gary,
I am curious.
What are typical times for Lehman half-life  decay?
What are the main causes of  decay?
Rob



Hi Gary & Rob,
 
    With a Lehman, you first need to set both the cross  balance and the 
period of the pendulum, but with NO external damping and with  the sensor coil 
DISCONNECTED. Put a peel off label on the mass and another on a  match box 
or similar. Mark lines on both with a fibre pen. Also  mark dots on the box 
at +/-1mm, +/-5mm and +/-10 mm and place it on the  frame just clear of the 
mass by 1~2mm. You place the line on the box  at the centre of the frame, 
centre the mass by hand to align the marks, release  it and see which way it 
drifts. You adjust the cross balance screws so that it  stays central. 
 
    Then you deflect the arm 10 mm, release it and time  one FULL cycle of 
oscillation when the arm swings past the central alignment and  when it 
swings past again going in the same direction. Then adjust the tilt of  the 
boom, usually with a screw on the base near the mass end, till you  get the 
chosen period, which should be a minimum of 15 seconds. I use  20 seconds. If 
you have difficulty in getting a stable period of 15 seconds, you  will need 
to improve your suspension. You may have to trim the cross balance  while 
doing this. If you have lock nuts and spring washers on the adjusting  screws, 
tighten them and recheck the cross balance. 
 
    You can then repeat the deflection to 10  mm and time how long it takes 
until the swing is reduced to ~half  amplitude, 5mm. You should aim for a 
time of >4 minutes. If the time is  much less than this, you have a lossy / 
poor system which may need  correction. You can get problems if the top wire 
is not firmly clamped, if the  suspension can flex, if you are trying to use 
either a point or a knife edge  lower 'bearing', if the arm can rotate 
about it's longitudinal axis, if the  frame is not sufficiently rigid, or if 
base mountings are not firm. No material  is free of loss when the load on it 
is changed.  Air flow damping may  be significant if you are trying to use 
capacitative position sensing, but it is  usually very small for coil + magnet 
or LVDT sensors. 
 
    Then plug the coil into the amplifier, switch on  the power, deflect 
the mass, release it and check that it swings at least  one full cycle. The 
amplifier input resistor / input circuit may add  damping. Progressively add 
more damping until on release from the 10  mm deflected position, the arm 
swings 0.5 mm PAST the zero and then back to  zero.  It is quite easy to judge 
0.5 mm if you use a fixed x4 mounted  magnifying glass to observe the 
balance position. Trying to do this 'by eye' is  more difficult.
 
    I hope that this will help.
 
    Regards,
 
    Chris Chapman
    
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16809" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 18/04/2009, rog@.......... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 
  size=3D2>Gary,<BR>I am curious.<BR>What are typical times for Lehman hal=
f-life 
  decay?<BR>What are the main causes of 
decay?<BR>Rob<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Gary &amp; Rob,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;With a Lehman, you first need to set both the=
 cross 
balance and the period of the pendulum, but with NO external damping and=
 with 
the sensor coil DISCONNECTED. Put a peel off label on the mass and another=
 on a 
match box or similar. Mark&nbsp;lines on both with a fibre pen. Also 
mark&nbsp;dots on the box at +/-1mm, +/-5mm and +/-10 mm and place it on=
 the 
frame&nbsp;just clear of the mass by 1~2mm.&nbsp;You place the line on the=
 box 
at the centre of the frame, centre the mass by hand to align the marks, re=
lease 
it and see which way it drifts. You adjust the cross balance screws so tha=
t it 
stays central. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Then you deflect the arm 10 mm, release it an=
d time 
one FULL cycle of oscillation when the arm swings past the central alignme=
nt and 
when it swings past again going in the same direction. Then adjust the til=
t of 
the boom, usually with a screw on the base near the mass end, till you 
get&nbsp;the chosen period, which should be a minimum of 15 seconds.&nbsp;=
I use 
20 seconds. If you have difficulty in getting a stable period of 15 second=
s, you 
will need to improve your suspension. You may have to trim the cross balan=
ce 
while doing this. If you have lock nuts and spring washers on the adjustin=
g 
screws, tighten them and recheck the cross balance. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You can then repeat the deflection to 10 
mm&nbsp;and time how long it takes until the swing is reduced to ~half 
amplitude, 5mm.&nbsp;You should aim for a time of &gt;4 minutes. If the ti=
me is 
much less than this, you&nbsp;have a lossy / poor system which may need 
correction. You can get problems if the top wire is not firmly clamped, if=
 the 
suspension can flex, if you are trying to use either a point or a knife ed=
ge 
lower 'bearing', if the arm can rotate about it's longitudinal axis, if th=
e 
frame is not sufficiently rigid, or if base mountings are not firm. No mat=
erial 
is&nbsp;free of loss when the load on it is changed. &nbsp;Air flow dampin=
g may 
be significant if you are trying to use capacitative position sensing, but=
 it is 
usually very small for coil + magnet or LVDT sensors. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Then plug the coil into the amplifier, switch=
 on 
the power, deflect the mass, release it&nbsp;and check that it swings at=
 least 
one full cycle. The amplifier input resistor / input circuit may add 
damping.&nbsp;Progressively add&nbsp;more damping until on release from th=
e 10 
mm deflected position, the arm swings 0.5 mm PAST the zero and then back=
 to 
zero.&nbsp; It is quite easy to judge 0.5 mm if you use a fixed x4 mounted=
 
magnifying glass to observe the balance position. Trying to do this 'by ey=
e' is 
more difficult.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I hope that this will help.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;</DIV></FONT></BODY></HTML>

Subject: Re: Lehman sensor friction
From: "Robert O. Green"  rog@.......... 
Date: Sat, 18 Apr 2009 18:49:56 -0700

Chris,

Thank you.  I appreciate your willingness to share your detailed 
experience with and understanding of Lehman sensors.

I am almost ready to start building one.

I have a question regarding the lower pivot.  I read the material you 
provided previously.  It seems a SS plate on the horizontal arm working 
against a SS ball bearing on the vertical is a good choice.  Is my 
understanding correct?

I am planing a crossed carbide drill shafts for the upper pivot.

Thanks again  for all your help.

Sincerely,

Rob


ChrisAtUpw@....... wrote:
> In a message dated 18/04/2009, rog@.......... writes:
>
>     Gary,
>     I am curious.
>     What are typical times for Lehman half-life decay?
>     What are the main causes of decay?
>     Rob
>
> Hi Gary & Rob,
>     With a Lehman, you first need to set both the cross balance and 
> the period of the pendulum, but with NO external damping and with the 
> sensor coil DISCONNECTED. Put a peel off label on the mass and another 
> on a match box or similar. Mark lines on both with a fibre pen. Also 
> mark dots on the box at +/-1mm, +/-5mm and +/-10 mm and place it on 
> the frame just clear of the mass by 1~2mm. You place the line on the 
> box at the centre of the frame, centre the mass by hand to align the 
> marks, release it and see which way it drifts. You adjust the cross 
> balance screws so that it stays central.
>     Then you deflect the arm 10 mm, release it and time one FULL cycle 
> of oscillation when the arm swings past the central alignment and when 
> it swings past again going in the same direction. Then adjust the tilt 
> of the boom, usually with a screw on the base near the mass end, till 
> you get the chosen period, which should be a minimum of 15 seconds. I 
> use 20 seconds. If you have difficulty in getting a stable period of 
> 15 seconds, you will need to improve your suspension. You may have to 
> trim the cross balance while doing this. If you have lock nuts and 
> spring washers on the adjusting screws, tighten them and recheck the 
> cross balance.
>     You can then repeat the deflection to 10 mm and time how long it 
> takes until the swing is reduced to ~half amplitude, 5mm. You should 
> aim for a time of >4 minutes. If the time is much less than this, 
> you have a lossy / poor system which may need correction. You can get 
> problems if the top wire is not firmly clamped, if the suspension can 
> flex, if you are trying to use either a point or a knife edge lower 
> 'bearing', if the arm can rotate about it's longitudinal axis, if the 
> frame is not sufficiently rigid, or if base mountings are not firm. No 
> material is free of loss when the load on it is changed.  Air flow 
> damping may be significant if you are trying to use capacitative 
> position sensing, but it is usually very small for coil + magnet or 
> LVDT sensors.
>     Then plug the coil into the amplifier, switch on the power, 
> deflect the mass, release it and check that it swings at least one 
> full cycle. The amplifier input resistor / input circuit may add 
> damping. Progressively add more damping until on release from the 10 
> mm deflected position, the arm swings 0.5 mm PAST the zero and then 
> back to zero.  It is quite easy to judge 0.5 mm if you use a fixed x4 
> mounted magnifying glass to observe the balance position. Trying to do 
> this 'by eye' is more difficult.
>     I hope that this will help.
>     Regards,
>     Chris Chapman
> ------------------------------------------------------------------------
>
>
> Internal Virus Database is out of date.
> Checked by AVG - http://www.avg.com
> Version: 8.0.176 / Virus Database: 270.11.48/2048 - Release Date: 4/8/2009 7:02 PM
>
>   

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Lehman sensor friction - design consideratons
From: ChrisAtUpw@.......
Date: Sun, 19 Apr 2009 23:47:53 EDT

In a message dated 19/04/2009, rog@.......... writes:

I have a  question regarding the lower pivot. I read the material you 
provided  previously. It seems a SS plate on the horizontal arm working against a 
SS  ball bearing on the vertical is a good choice.  Is my understanding  
correct?
Hi Rob,
 
    That is quite correct. One system that I use has  this. I usually work 
at 20 seconds to minimise tilt drifts and optimise surface  wave pickup, but 
I can set it up for a stable 60 second swing. The SEPUK1 which  has crossed 
WC needle rollers can also be set up for periods much greater than  20 
seconds.

I am  planning a crossed carbide drill shafts for the upper pivot.
    Mount the balls or sloping vertical needle rollers  on the upright 
stand and the plates or horizontal rollers on the arm and the  diagonal 
suspension. This minimises angular contact errors and lessens  significantly the 
chance of the bearings slipping in operation. 
 
    You can also use a flexing wire in tension for  either or both 
suspensions. See _http://jclahr.com/science/psn/gate.html_ 
(http://jclahr.com/science/psn/gate.html) 
 
    You could use crossed shanks for both bearings?  This may be the 
simplest solution, but not the cheapest.
    Or use SS ball bearings for both? Drill out a  larger SS bolt to take 
say a 5/16" bearing and turn / file off the top threads  to leave a short 
thin tube with a V bottom. File off the top of the tube at the  angle of the 
top suspension and stick a ball to the V bottom. Mount the bolt  vertically on 
an L bracket fitted to the upright. Bend a U of brass  strip and solder a 
flat brass plate across the end. Stick a rectangle cut  from a scalpel blade 
to the inside of the flat plate with two part acrylic glue.  Epoxy is too 
brittle for this job. Two part polyurethane should also be OK.  Neither of 
these set 'brittle hard'. This U fitting fits over the vertically  mounted SS 
bearing.
 
    Consider an Al base 30" long. The expansion of  Al is 23 ppm / C deg. 
So a 10 C change of temperature results in a  30x10x23^-6 = 7 thou" change in 
length! This will make the support legs to  slide over their mounting 
plates and will move any play / slop in the threads.  Commercial seismometers may 
use fine thread support fittings over 1/2"  long, which are slotted 
parallel to the axis. The slot is compressed with a bolt  to clamp the outer thread 
to the threaded shaft after the position has been set. 
 
    Alternatively, you can use a wavy washer and a lock  nut on top of the 
frame to clamp the thread in place. I use a 3" x 1" x 1/8" Al  U channel 
frame fitted with 6" corner plates. I drill 1/2" OD Al alloy rod 3/4"  long 
with a 6 mm drill and turn off the ends square. I drill a 6 mm hole in the  
frame. I fit a 6 mm bolt + locknut through the rod, put acrylic adhesive on the 
 free end of the rod and on a spare nut, put the bolt through the frame, 
thread  on the nut + adhesive and clamp the fitting firmly with the locknut 
until  the adhesive is set. Lightly coat the bolt thread with Vaseline and 
then wipe  it to prevent adhesion.
 
    The ground will likely expand by a  smaller amount and more slowly, so 
the three mountings are trying to  slide about most of the time!!! I tip my 
6 mm SS mounting bolts with 5 mm SS  bearings and provide 2" square x 1/8" 
flat SS support plates stuck to  the concrete floor with pool cement. I don't 
have any significant tilt  drift problems. You are likely to see tilt 
drifts over time if you don't use a  hard flat stable base / flat ground plates 
and don't clamp the  threads.
 
    You need to make the arm quite rigid. Amateur  designs seem often to 
have no damping / mechanical constraint to counter  rotational motion of the 
seismometer arm about it's long axis. If the  centre of the damping force is 
either above or below the line joining the centre  of mass to the lower 
bearing, any quake signal will try to rotate the arm as  well as move it side to 
side. Since there is no or low damping on this motion,  the movement can be 
quite large and this may show up as a large background  peak at a few Hz. 
This may be opposed by fitting a rigid top suspension tube  similar to the 
arm, or by using a V cable suspension from the top of the support  column to a 
6" to 8" long crossbar bolted to the arm near the mass. I  use 7 core nylon 
coated SS 30 lb fishing trace for this. The cable ends are  loops fitted in 
round V grooves on the crossbar and are crimped with the  tubes provided. 
This seems to work well and it is not expensive. The top fitting  is a 1.5" 
OD SS mudguard washer with a V groove turned / filed around it's edge.  This 
is stuck onto the top bearing frame / wire clamp. 
 
    You should choose a site with the minimum daily  temperature variations 
around the seismometer. It MUST be shielded from direct  sunlight. You can 
buy LCD digital thermometers which run off a 1.5V battery,  indicate to 0.1 
C Deg and record minimum and maximum readings. Covering the  floor with 
insulating material around the seismometer can also help. You  definitely do 
need an airtight shielding case to prevent drafts and to  minimise any air 
convection, preferably made out of Celotex sheet foam or  similar.  A large 
folded cover sheet of bubble wrap with the bubbles inside  can help. 
    You can also get reverse convection noise late at  night / about dawn 
if the case temperature falls below the ground temperature.  Rolls of air 
peel off the inside of the case, fall to the ground and push the  arm about. 
This can be cured by mounting a small heater ~10W inside the top of  the 
seismometer case to keep a +ve air temperature gradient inside at all times. 
 
    Have a look at the damping and sensor designs at 
_http://jclahr.com/science/psn/chapman/index.html_ 
(http://jclahr.com/science/psn/chapman/index.html)  
 
    I hope that these comments may be of help. The  Lehman designs on psn 
use out of date / poor techniques which need to be  completely revised. I 
advise against trying to use oil damping; point  or knife blade bearings; 
separated suspension, damping and sensor modules;  Alnico U magnet and coil 
sensors; magnets and ferromagnetic components on the  arm and single wire 
suspensions. These are ALL best avoided!
 
    Regards,
 
    Chris Chapman
    
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16809" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>In a message dated 19/04/2009, rog@.......... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>I have a 
  question regarding the lower pivot.&nbsp;I read the material you provide=
d 
  previously. It seems a SS plate on the horizontal arm working against a=
 SS 
  ball bearing on the vertical is a good choice.&nbsp; Is my understanding=
 
  correct?</FONT></BLOCKQUOTE>
<DIV>Hi Rob,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;That is quite correct. One system that I use=
 has 
this. I usually work at 20 seconds to minimise tilt drifts and optimise su=
rface 
wave pickup, but I can set it up for a stable 60 second swing. The SEPUK1=
 which 
has crossed WC needle rollers can also be set up for periods much greater=
 than 
20 seconds.</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>I am 
  planning a crossed carbide drill shafts for the upper pivot.</FONT></BLO=
CKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Mount the balls or sloping vertical needle ro=
llers 
on the upright stand and the plates or horizontal rollers on the arm and=
 the 
diagonal suspension. This minimises angular contact errors and lessens 
significantly the chance of the bearings slipping in operation. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You can also use a flexing wire in tension fo=
r 
either or both&nbsp;suspensions. See <A 
href=3D"http://jclahr.com/science/psn/gate.html">http://jclahr.com/science=
/psn/gate.html</A></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You could use crossed shanks for both bearing=
s? 
This may be the simplest solution, but not the cheapest.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Or use SS ball bearings for both? Drill out=
 a 
larger SS bolt to take say a 5/16" bearing and turn / file off the top thr=
eads 
to leave a short thin tube with a V bottom. File off the top of the tube=
 at the 
angle of the top suspension and stick a ball to the V bottom. Mount the bo=
lt 
vertically on an L bracket&nbsp;fitted to&nbsp;the upright. Bend a U of br=
ass 
strip and solder a flat brass plate across the end. Stick a rectangle&nbsp=
;cut 
from a scalpel blade to the inside of the flat plate with two part acrylic=
 glue. 
Epoxy is too brittle for this job. Two part polyurethane should also be OK=
.. 
Neither of these set 'brittle hard'. This U fitting fits over the vertical=
ly 
mounted SS bearing.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Consider an Al&nbsp;base 30" long. The expans=
ion of 
Al&nbsp;is 23 ppm / C deg. So a 10 C change of temperature&nbsp;results in=
 a 
30x10x23^-6&nbsp;=3D 7 thou" change in length! This will make the support=
 legs to 
slide over their mounting plates and will move any play / slop in the thre=
ads. 
Commercial seismometers may use fine&nbsp;thread support fittings over 1/2=
" 
long, which are slotted parallel to the axis. The slot is compressed with=
 a bolt 
to clamp the outer thread to the threaded shaft after the position has bee=
n set. 
</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Alternatively, you can use a wavy washer and=
 a lock 
nut on top of the frame to clamp the thread in place. I use a 3" x 1" x 1/=
8" Al 
U channel frame fitted with 6" corner plates. I drill 1/2" OD Al alloy rod=
 3/4" 
long with a 6 mm drill and turn off the ends square. I drill a 6 mm hole=
 in the 
frame. I fit a 6 mm bolt + locknut through the rod, put acrylic adhesive=
 on the 
free end of the rod and on a spare nut, put the bolt through the frame, th=
read 
on the nut + adhesive&nbsp;and clamp the fitting firmly with the locknut=
 until 
the adhesive is set. Lightly coat the bolt thread with Vaseline and then=
 wipe 
it&nbsp;to prevent adhesion.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The ground will likely expand by a 
smaller&nbsp;amount and more slowly, so the&nbsp;three mountings are tryin=
g to 
slide about most of the time!!! I tip my 6 mm SS mounting bolts with 5 mm=
 SS 
bearings and provide 2" square x 1/8" flat SS support plates stuck to 
the&nbsp;concrete floor with pool cement.&nbsp;I don't have any significan=
t tilt 
drift problems. You are likely to see tilt drifts over time if you don't=
 use a 
hard&nbsp;flat stable base / flat ground plates and don't clamp the 
threads.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You need to make the arm quite rigid. Amateur=
 
designs seem often to have no damping / mechanical constraint to counter=
 
rotational motion of the seismometer arm about it's long axis.&nbsp;If the=
 
centre of the damping force is either above or below the line joining the=
 centre 
of mass to the lower bearing, any quake signal will try to rotate the arm=
 as 
well as move it side to side. Since there is no or low damping on this mot=
ion, 
the movement can be quite large and&nbsp;this may show up as a large backg=
round 
peak at a few Hz. This may be opposed by fitting a rigid top suspension tu=
be 
similar to the arm, or by using a V cable suspension from the top of the=
 support 
column to a&nbsp;6" to 8"&nbsp;long crossbar bolted to the arm near the ma=
ss. I 
use 7 core nylon coated SS 30 lb fishing trace for this. The cable ends ar=
e 
loops fitted in round&nbsp;V grooves on the crossbar and are crimped with=
 the 
tubes provided. This seems to work well and it is not expensive. The top=
 fitting 
is a 1.5" OD SS mudguard washer with a V groove turned / filed around it's=
 edge. 
This is stuck onto the top&nbsp;bearing frame / wire clamp.&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You should choose a site with the minimum dai=
ly 
temperature variations around the seismometer. It MUST be shielded from di=
rect 
sunlight. You can buy LCD digital thermometers which run off a 1.5V batter=
y, 
indicate to 0.1 C Deg and record minimum and maximum readings. Covering&nb=
sp;the 
floor with insulating material around the seismometer can also help. You=
 
definitely do need an airtight&nbsp;shielding case to prevent drafts and=
 to 
minimise any air convection, preferably made out of Celotex sheet foam or=
 
similar.&nbsp; A large folded cover sheet of bubble wrap with the bubbles=
 inside 
can help.&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You can also get reverse convection noise lat=
e at 
night / about dawn if the case temperature falls below the ground temperat=
ure. 
Rolls of air peel off the inside of the case, fall to the ground and push=
 the 
arm about. This can be cured by mounting a small heater ~10W inside the to=
p of 
the seismometer case to keep a +ve air temperature gradient inside at all=
 times. 
</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Have a look at the damping and sensor designs=
 at <A 
href=3D"http://jclahr.com/science/psn/chapman/index.html">http://jclahr.co=
m/science/psn/chapman/index.html</A>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I hope that these comments may be of help. Th=
e 
Lehman designs on psn use out of date / poor techniques which&nbsp;need to=
 be 
completely revised.&nbsp;I advise against&nbsp;trying to use oil damping;=
 point 
or knife blade bearings; separated suspension, damping and sensor modules;=
 
Alnico U magnet and coil sensors; magnets and ferromagnetic components on=
 the 
arm and single wire suspensions. These are ALL best avoided!</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;</DIV></FONT></BODY></HTML>

Subject: Seismic detector with AIS326DQ
From: alexander mirabal  alexmirabal2000@........ 
Date: Wed, 22 Apr 2009 22:30:52 +0000 (GMT)

Hello there,
=A0
I am sure this matter has been covered here before, but can't find it and w=
ould like your comments about the following:
=A0
I need to build a device that alarms when a seism takes places, preferably =
in an early state, let's say, for being used in public buildings or schools=
.. It is not intended to measure and record the magnitud of the earth moveme=
nt at all, just detect once it reaches certain level in any of the 3 axis a=
nd activate a sound/visual indication.
=A0
As a first aproximation, I was taking a look to this IC: AIS326DQ http://ww=
w.st.com/stonline/products/literature/ds/14956/ais326dq.pdf, but honestly I=
 have no practical criteria to determine in advance=A0if it sensitive enoug=
h for my purpose.=A0 The manufacturer web page mentions it is for automotiv=
e applications, but my feeling is that the accelerations changes in such en=
vironments are far beyond the ones I need to deal with.
=A0
In case you consider it not suittable for this application, could any of yo=
u, please, recommend some other chip?
=A0
I am located in Mexico City.
=A0
Thanks in advance,
=A0
Alexander

=A0=0A=0A=0A      
<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;"><DIV>Hello there,</DIV>
<DIV>&nbsp;</DIV>
<DIV>I am sure this matter has been covered here before, but can't find it =
and would like your comments about the following:</DIV>
<DIV>&nbsp;</DIV>
<DIV>I need to build a device that alarms when a seism takes places, prefer=
ably in an early state, let's say, for being used in public buildings or sc=
hools. It is not intended to measure and record the magnitud of the earth m=
ovement at all, just detect once it reaches certain level in any of the 3 a=
xis and activate a sound/visual indication.</DIV>
<DIV>&nbsp;</DIV>
<DIV>As a first aproximation, I was taking a look to this IC: AIS326DQ <A h=
ref=3D"http://www.st.com/stonline/products/literature/ds/14956/ais326dq.pdf=
">http://www.st.com/stonline/products/literature/ds/14956/ais326dq.pdf</A>,=
 but honestly I have no practical criteria to determine in advance&nbsp;if =
it sensitive enough for my purpose.&nbsp; The manufacturer web page mention=
s it is for automotive applications, but my feeling is that the acceleratio=
ns changes in such environments are far beyond the ones I need to deal with=
..</DIV>
<DIV>&nbsp;</DIV>
<DIV>In case you consider it not suittable for this application, could any =
of you, please, recommend some other chip?</DIV>
<DIV>&nbsp;</DIV>
<DIV>I am located in Mexico City.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Thanks in advance,</DIV>
<DIV>&nbsp;</DIV>
<DIV>Alexander</DIV>
<DIV><BR>&nbsp;</DIV></td></tr></table><br>=0A=0A=0A=0A      

Subject: Re: TELEDYNE GEOTECH HELICORDERS
From: "James Allen"  jcallen1@........... 
Date: Wed, 22 Apr 2009 19:54:20 -0700

There is a large lot of Teledyne Geotech Helicorders just listed on Ebay =
today.  Problem is, it is a very large "lot auction"  that would entail =
shipping cost for hundreds of pounds of equipment.
James Allen
  ----- Original Message -----=20
  From: ChrisAtUpw@..........
  To: psn-l@.................
  Sent: Thursday, October 02, 2008 4:33 PM
  Subject: Re: Torsion Seismometer


  In a message dated 2008/10/02, tchannel1@............ writes:


    I have seen something similar somewhere on the web, but I can't find =
it.   This is all I could find.   If someone has tried this please email =
me.   Thanks, Ted
    Torsion Seismometer Wood Anderson
    http://www.data.scec.org/Module/s3inset3.html


  Hi Ted,

         The Wood-Anderson was a horizontal system with a torsion =
suspension, magnetic damping, optical + photographic recording and a =
period of about a second. There is no reason why you could not fit a =
dual Si photocell readout system.=20

         To increase the period you can reduce the wire diameter / =
increase the wire length / mount the mass on an extended side boom to =
increase the inertia.

         Check out
         http://doga.ogs.trieste.it/doga/risk/woodanderson/index.html
         http://www.eas.slu.edu/Earthquake_Center/Instruments/

         Randall Peters has a vertical torsion device on this website.
         http://physics.mercer.edu/hpage/peters.html

         Regards,

         Chris Chapman 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.6001.18226" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>There is a large lot of Teledyne =
Geotech=20
Helicorders just listed on Ebay today.&nbsp; Problem is, it is a very =
large "lot=20
auction"&nbsp; that would entail shipping cost for hundreds of pounds of =

equipment.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>James Allen</FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3DChrisAtUpw@..........
  href=3D"mailto:ChrisAtUpw@.......">ChrisAtUpw@.......</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, October 02, =
2008 4:33=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: Torsion =
Seismometer</DIV>
  <DIV><BR></DIV><FONT face=3Darial,helvetica><FONT size=3D2 =
PTSIZE=3D"10">In a=20
  message dated 2008/10/02, <A=20
  href=3D"mailto:tchannel1@............">tchannel1@............</A>=20
writes:<BR><BR>
  <BLOCKQUOTE=20
  style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px =
solid; MARGIN-RIGHT: 0px"=20
  TYPE=3D"CITE">I have seen something similar somewhere on the web, but =
I can't=20
    find it.&nbsp;&nbsp; This is all I could find.&nbsp;&nbsp; If =
someone has=20
    tried this please email me.&nbsp;&nbsp; Thanks, Ted</FONT><FONT =
lang=3D0=20
    style=3D"BACKGROUND-COLOR: #ffffff" face=3DArial color=3D#000000 =
size=3D3=20
    PTSIZE=3D"12" FAMILY=3D"SANSSERIF" BACK=3D"#ffffff"><BR></FONT><FONT =
lang=3D0=20
    style=3D"BACKGROUND-COLOR: #ffffff" face=3DArial color=3D#000000 =
size=3D2=20
    PTSIZE=3D"10" FAMILY=3D"SANSSERIF" BACK=3D"#ffffff">Torsion =
Seismometer Wood=20
    Anderson</FONT><FONT lang=3D0 style=3D"BACKGROUND-COLOR: #ffffff" =
face=3DArial=20
    color=3D#000000 size=3D3 PTSIZE=3D"12" FAMILY=3D"SANSSERIF"=20
    BACK=3D"#ffffff"><BR></FONT><FONT lang=3D0 =
style=3D"BACKGROUND-COLOR: #ffffff"=20
    face=3DArial color=3D#0000ff size=3D2 PTSIZE=3D"10" =
FAMILY=3D"SANSSERIF"=20
    BACK=3D"#ffffff"><A=20
    =
href=3D"http://www.data.scec.org/Module/s3inset3.html">http://www.data.sc=
ec.org/Module/s3inset3.html</A></FONT><FONT=20
    lang=3D0 style=3D"BACKGROUND-COLOR: #ffffff" face=3DArial =
color=3D#000000 size=3D3=20
    PTSIZE=3D"12" FAMILY=3D"SANSSERIF" =
BACK=3D"#ffffff"></BLOCKQUOTE><BR></FONT><FONT=20
  lang=3D0 style=3D"BACKGROUND-COLOR: #ffffff" face=3DArial =
color=3D#000000 size=3D2=20
  PTSIZE=3D"10" FAMILY=3D"SANSSERIF" BACK=3D"#ffffff"><BR>Hi=20
  Ted,<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The Wood-Anderson was =
a=20
  horizontal system with a torsion suspension, magnetic damping, optical =
+=20
  photographic recording and a period of about a second. There is no =
reason why=20
  you could not fit a dual Si photocell readout system.=20
  <BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; To increase the period =
you can=20
  reduce the wire diameter / increase the wire length / mount the mass =
on an=20
  extended side boom to increase the=20
  inertia.<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Check=20
  out<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  =
http://doga.ogs.trieste.it/doga/risk/woodanderson/index.html<BR>&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  =
http://www.eas.slu.edu/Earthquake_Center/Instruments/<BR><BR>&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;=20
  Randall Peters has a vertical torsion device on this=20
  website.<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
  =
http://physics.mercer.edu/hpage/peters.html<BR><BR>&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;=20
  Regards,<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Chris =
Chapman</FONT>=20
  </FONT></BLOCKQUOTE></BODY></HTML>

Subject: RE: TELEDYNE GEOTECH HELICORDERS
From: "Kareem Lanier"  system98765@............. 
Date: Wed, 22 Apr 2009 20:10:21 -0700

 Whats the ebay part number?

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of James Allen
Sent: Wednesday, April 22, 2009 7:54 PM
To: psn-l@..............
Subject: Re: TELEDYNE GEOTECH HELICORDERS

There is a large lot of Teledyne Geotech Helicorders just listed on Ebay
today.  Problem is, it is a very large "lot auction"  that would entail
shipping cost for hundreds of pounds of equipment.
James Allen

	----- Original Message ----- 
	From: ChrisAtUpw@....... 
	To: psn-l@.............. 
	Sent: Thursday, October 02, 2008 4:33 PM
	Subject: Re: Torsion Seismometer

	In a message dated 2008/10/02, tchannel1@............ writes:
	
	

		I have seen something similar somewhere on the web, but I
can't find it.   This is all I could find.   If someone has tried this
please email me.   Thanks, Ted
		Torsion Seismometer Wood Anderson
		http://www.data.scec.org/Module/s3inset3.html


	
	Hi Ted,
	
	       The Wood-Anderson was a horizontal system with a torsion
suspension, magnetic damping, optical + photographic recording and a period
of about a second. There is no reason why you could not fit a dual Si
photocell readout system. 
	
	       To increase the period you can reduce the wire diameter /
increase the wire length / mount the mass on an extended side boom to
increase the inertia.
	
	       Check out
	       http://doga.ogs.trieste.it/doga/risk/woodanderson/index.html
	       http://www.eas.slu.edu/Earthquake_Center/Instruments/
	
	       Randall Peters has a vertical torsion device on this website.
	       http://physics.mercer.edu/hpage/peters.html
	
	       Regards,
	
	       Chris Chapman 


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Seismic detector with AIS326DQ
From: ChrisAtUpw@.......
Date: Wed, 22 Apr 2009 23:39:09 EDT

In a message dated 22/04/2009, alexmirabal2000@........ writes:

I need to build a device that alarms when a seism takes place, preferably  
in an early state, let's say, for being used in public buildings or schools. 
 It is not intended to measure and record the magnitude of the earth 
movement  at all, just detect once it reaches certain level in any of the 3 axis 
and  activate a sound/visual indication.
 
As a first approximation, I was taking a look to this IC: AIS326DQ 
_http://www.st.com/stonline/products/literature/ds/14956/ais326dq.pdf_ 
(http://www.st.com/stonline/products/literature/ds/14956/ais326dq.pdf) ,  but honestly I 
have no practical criteria to determine in advance if it  sensitive enough 
for my purpose.  The manufacturer web page mentions it  is for automotive 
applications, but my feeling is that the accelerations  changes in such 
environments are far beyond the ones I need to deal  with.

Hi Alexander,
 
    If you look at the data sheet, the minimum  detection level is 1 milli 
g and you only have a 12 bit ADC. These MEMs devices  do not have the high 
sensitivity, low noise and resolution that I would normally  consider for 
seismic applications. They use 3.3V supplies and low level digital  outputs, 
not 5V. There is NO low pass filter to remove noise.
 
    You still have to take measurements in the real  world, with all the 
environmental background noise that this entails. 
 
    See the comments about noise and drift at 
_http://psn.quake.net/strongmotion.html_ (http://psn.quake.net/strongmotion.html) 
 
    Larry does offer a triaxial sensor board 
_http://psn.quake.net/psnaccel/_ (http://psn.quake.net/psnaccel/) 

In case you consider it not suitable for this application, could any of  
you, please, recommend some other chip?

    Not really. However, you can make a sensitive  detector using a 44 mm 
OD piezo disk from _www.digikey.com_ (http://www.digikey.com)  such as 
102-1170-ND @ $1.62  each with added load weights, but you do have to produce all 
the electronics,  filters and an ADC. This is quite a lot of work. How good 
are you at designing /  building electronics? 
 
    I use similar discs in flex bending mode, not as a  loaded drum. You 
can also buy high capacity disks already mounted in plastic  cases, but their 
output is nearly square law, not linear like a simple flex  disk. The flex 
disk that I use gives over 5x the voltage output of a 4.5 Hz L15B  geophone 
see _http://psn.quake.net/geophone/index.html_ 
(http://psn.quake.net/geophone/index.html)  and  the setup can go down to 10 seconds period. Note that you 
may want to detect P  and S waves from 0.5 Hz to 5 Hz. 
 
    Let me know if you want any further help?

I am located in Mexico City.


    Regards,
 
    Chris Chapman in UK
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>In a message dated 22/04/2009, alexmirabal2000@........ writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000>
  <DIV>I need to build a device that alarms when a seism takes place, pref=
erably 
  in an early state, let's say, for being used in public buildings or scho=
ols. 
  It is not intended to measure and record the magnitude of the earth move=
ment 
  at all, just detect once it reaches certain level in any of the 3 axis=
 and 
  activate a sound/visual indication.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>As a first approximation, I was taking a look to this IC: AIS326DQ=
 <A 
  title=3Dhttp://www.st.com/stonline/products/literature/ds/14956/ais326dq=
..pdf 
  href=3D"http://www.st.com/stonline/products/literature/ds/14956/ais326dq=
..pdf">http://www.st.com/stonline/products/literature/ds/14956/ais326dq.pdf=
</A>, 
  but honestly I have no practical criteria to determine in advance&nbsp;i=
f it 
  sensitive enough for my purpose.&nbsp; The manufacturer web page mention=
s it 
  is for automotive applications, but my feeling is that the accelerations=
 
  changes in such environments are far beyond the ones I need to deal 
  with.</FONT></DIV></BLOCKQUOTE>
<DIV>Hi Alexander,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;If you look at the data sheet, the minimum 
detection level is 1 milli g and you only have a 12 bit ADC. These MEMs de=
vices 
do not have the high sensitivity, low noise and resolution that I would no=
rmally 
consider for seismic applications. They use 3.3V supplies and low level di=
gital 
outputs, not 5V. There is NO low pass filter to remove noise.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You still have to take measurements in the re=
al 
world, with all&nbsp;the environmental background noise that this entails.=
 
</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;See the comments about noise and drift at <A=
 
href=3D"http://psn.quake.net/strongmotion.html">http://psn.quake.net/stron=
gmotion.html</A></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Larry does offer a triaxial sensor board <A=
 
href=3D"http://psn.quake.net/psnaccel/">http://psn.quake.net/psnaccel/</A>=
</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000>
  <DIV>In case you consider it not suitable for this application, could an=
y of 
  you, please, recommend some other chip?</FONT></DIV></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Not really. However, you can make a sensitive=
 
detector using a 44 mm OD piezo disk from <A 
href=3D"http://www.digikey.com">www.digikey.com</A> such as 102-1170-ND @=
 $1.62 
each with added load weights, but you do have to produce all the electroni=
cs, 
filters and an ADC. This is quite a lot of work. How good are you at desig=
ning / 
building electronics? </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I use similar discs in flex bending mode, not=
 as a 
loaded drum. You can also buy high capacity disks already mounted in plast=
ic 
cases, but their output is nearly square law, not linear like a simple fle=
x 
disk. The flex disk that I use gives over 5x the voltage output of a 4.5=
 Hz L15B 
geophone see <A 
href=3D"http://psn.quake.net/geophone/index.html">http://psn.quake.net/geo=
phone/index.html</A>&nbsp;and 
the setup can go down to 10 seconds period. Note that you may want to dete=
ct P 
and S waves from 0.5 Hz to 5 Hz. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Let me know if you want any further help?</DI=
V>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000>
  <DIV>I am located in Mexico City.</DIV></FONT></BLOCKQUOTE>
<DIV></DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman in UK</DIV></FONT></BODY></HTML=
>

Subject: Re: TELEDYNE GEOTECH HELICORDERS
From: "James Allen"  jcallen1@........... 
Date: Wed, 22 Apr 2009 20:49:43 -0700

The Ebay Item Number is 200334607108
----- Original Message ----- 
From: "Kareem Lanier" <system98765@.............>
To: <psn-l@..............>
Sent: Wednesday, April 22, 2009 8:10 PM
Subject: RE: TELEDYNE GEOTECH HELICORDERS


> Whats the ebay part number?
>
> -----Original Message-----
> From: psn-l-request@.............. [mailto:psn-l-request@............... 
> On
> Behalf Of James Allen
> Sent: Wednesday, April 22, 2009 7:54 PM
> To: psn-l@..............
> Subject: Re: TELEDYNE GEOTECH HELICORDERS
>
> There is a large lot of Teledyne Geotech Helicorders just listed on Ebay
> today.  Problem is, it is a very large "lot auction"  that would entail
> shipping cost for hundreds of pounds of equipment.
> James Allen
>
> ----- Original Message ----- 
> From: ChrisAtUpw@.......
> To: psn-l@..............
> Sent: Thursday, October 02, 2008 4:33 PM
> Subject: Re: Torsion Seismometer
>
> In a message dated 2008/10/02, tchannel1@............ writes:
>
>
>
> I have seen something similar somewhere on the web, but I
> can't find it.   This is all I could find.   If someone has tried this
> please email me.   Thanks, Ted
> Torsion Seismometer Wood Anderson
> http://www.data.scec.org/Module/s3inset3.html
>
>
>
> Hi Ted,
>
>        The Wood-Anderson was a horizontal system with a torsion
> suspension, magnetic damping, optical + photographic recording and a 
> period
> of about a second. There is no reason why you could not fit a dual Si
> photocell readout system.
>
>        To increase the period you can reduce the wire diameter /
> increase the wire length / mount the mass on an extended side boom to
> increase the inertia.
>
>        Check out
>        http://doga.ogs.trieste.it/doga/risk/woodanderson/index.html
>        http://www.eas.slu.edu/Earthquake_Center/Instruments/
>
>        Randall Peters has a vertical torsion device on this website.
>        http://physics.mercer.edu/hpage/peters.html
>
>        Regards,
>
>        Chris Chapman
>
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information. 

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: TELEDYNE GEOTECH HELICORDERS
From: meredith lamb  paleoartifact@......... 
Date: Thu, 23 Apr 2009 00:08:50 -0600

On Wed, Apr 22, 2009 at 9:49 PM, James Allen <jcallen1@...........> wrote:

> The Ebay Item Number is 200334607108
> ----- Original Message ----- From: "Kareem Lanier" <
> system98765@.............>
> To: <psn-l@..............>
> Sent: Wednesday, April 22, 2009 8:10 PM
> Subject: RE: TELEDYNE GEOTECH HELICORDERS
>
>
>
>  Whats the ebay part number?
>>
>> -----Original Message-----
>> From: psn-l-request@.............. [mailto:psn-l-request@...............
>> On
>> Behalf Of James Allen
>> Sent: Wednesday, April 22, 2009 7:54 PM
>> To: psn-l@..............
>> Subject: Re: TELEDYNE GEOTECH HELICORDERS
>>
>> There is a large lot of Teledyne Geotech Helicorders just listed on Ebay
>> today.  Problem is, it is a very large "lot auction"  that would entail
>> shipping cost for hundreds of pounds of equipment.
>> James Allen
>>
>> Hi all,
>

My "reasonable guess" is that they are from the NEIC in Golden, Colorado
(west edge of metro Denver).  Antiquated stuff of course.
Starting bid looks like a typo ~ $30.00!?  11 racks and 6 skids; one would
probably need a tractor trailer shipper....at a very much
higher cost add-on...perhaps 1k or even more??  Estimated 6000 pounds.  Each
drum unit is probably over 100 pounds each.  The way they "stacked" them on
the one photo skid probably means dents in the thin aluminum drum outer
diameter sides (ugh!).   Age (?)....1960's into the 1970's or thereabouts
but possibly newer dates for the electronics.  I know....drummer
delight...for some...but at a real high final cost for
the winning bidder is my two cents guess.

Take care, Meredith Lamb
<br><br><div class=3D"gmail_quote">On Wed, Apr 22, 2009 at 9:49 PM, James A=
llen <span dir=3D"ltr">&lt;<a href=3D"mailto:jcallen1@...........">jcallen1=
@...........</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" sty=
le=3D"border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex;=
 padding-left: 1ex;">
The Ebay Item Number is 200334607108<br>
----- Original Message ----- From: &quot;Kareem Lanier&quot; &lt;<a href=3D=
"mailto:system98765@............." target=3D"_blank">system98765@...........
com</a>&gt;<div class=3D"im"><br>
To: &lt;<a href=3D"mailto:psn-l@.............." target=3D"_blank">psn-l@web=
tronics.com</a>&gt;<br></div>
Sent: Wednesday, April 22, 2009 8:10 PM<br>
Subject: RE: TELEDYNE GEOTECH HELICORDERS<div><div></div><div class=3D"h5">=
<br>
<br>
<br>
<blockquote class=3D"gmail_quote" style=3D"border-left: 1px solid rgb(204, =
204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Whats the ebay part number?<br>
<br>
-----Original Message-----<br>
From: <a href=3D"mailto:psn-l-request@.............." target=3D"_blank">psn=
-l-request@..............</a> [mailto:<a href=3D"mailto:psn-l-request@webtr=
onics.com" target=3D"_blank">psn-l-request@..............</a>] On<br>
Behalf Of James Allen<br>
Sent: Wednesday, April 22, 2009 7:54 PM<br>
To: <a href=3D"mailto:psn-l@.............." target=3D"_blank">psn-l@webtron=
ics.com</a><br>
Subject: Re: TELEDYNE GEOTECH HELICORDERS<br>
<br>
There is a large lot of Teledyne Geotech Helicorders just listed on Ebay<br=
>
today. =A0Problem is, it is a very large &quot;lot auction&quot; =A0that wo=
uld entail<br>
shipping cost for hundreds of pounds of equipment.<br>
James Allen<br>
<br>
</blockquote>Hi all,</div></div></blockquote><div><br>My &quot;reasonable g=
uess&quot; is that they are from the NEIC in Golden, Colorado (west edge of=
 metro Denver).=A0 Antiquated stuff of course.<br>Starting bid looks like a=
 typo ~ $30.00!?=A0 11 racks and 6 skids; one would probably need a tractor=
 trailer shipper....at a very much<br>
higher cost add-on...perhaps 1k or even more??=A0 Estimated 6000 pounds.=A0=
 Each drum unit is probably over 100 pounds each.=A0 The way they &quot;sta=
cked&quot; them on the one photo skid probably means dents in the thin alum=
inum drum outer diameter sides (ugh!). =A0 Age (?)....1960&#39;s into the 1=
970&#39;s or thereabouts but possibly newer dates for the electronics.=A0 I=
 know....drummer delight...for some...but at a real high final cost for<br>
the winning bidder is my two cents guess.<br><br>Take care, Meredith Lamb<b=
r><br><br><br><br><br><br>=A0 <br><br><br><br><br><br>=A0=A0=A0 <br></div><=
/div><br>

Subject: Large Lot GEOTECH Earthquake Measuring Seismology Equip
From: mongo@.........
Date: Thu, 23 Apr 2009 12:46:05 +0000

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200334607108


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Large Lot GEOTECH Earthquake Measuring Seismology Equip
From: meredith lamb  paleoartifact@......... 
Date: Thu, 23 Apr 2009 08:49:06 -0600

On Thu, Apr 23, 2009 at 6:46 AM, <mongo@.........> wrote:

> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200334607108
>
> Hi again;
>

One more note on this lot.  Historically I do know that the thermal pens
used on these drums were a constant problem in being
either accidentally physically damaged or from occasional pen motor fast
response driven normal use damage.  Even many years ago they were
very expensive to obtain.  It wasn't unusual for such to be stripped from
unused equipment to be used.  I only noted one pen in the Ebay
photo's.  In short....the buyer "may" not get all the pens; and/or they
could also be "home brew" versions therein?  Its possible that
the pen motors themselves may be absent from, or short per the quanity of
drums?  The thermal paper used is also very expensive.
Just a cautionary buyer/bidder note.   I've been a visitor to the NEIC a few
times over the years and these problems were mentioned a
few times from a variety of folks there.   No; I am not bidding on the lot.

Take care, Meredith Lamb
<br><br><div class=3D"gmail_quote">On Thu, Apr 23, 2009 at 6:46 AM,  <span =
dir=3D"ltr">&lt;<a href=3D"mailto:mongo@.........">mongo@.........</a>&gt;<=
/span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"border-left: 1p=
x solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<a href=3D"http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&amp;item=3D2003346=
07108" target=3D"_blank">http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&amp;=
item=3D200334607108</a><br>
<br>
Hi again;<br>
</blockquote></div>=A0<br>One more note on this lot.=A0 Historically I do k=
now that the thermal pens used on these drums were a constant problem in be=
ing<br>either accidentally physically damaged or from occasional pen motor =
fast response driven normal use damage.=A0 Even many years ago they were<br=
>
very expensive to obtain.=A0 It wasn&#39;t unusual for such to be stripped =
from unused equipment to be used.=A0 I only noted one pen in the Ebay<br>ph=
oto&#39;s.=A0 In short....the buyer &quot;may&quot; not get all the pens; a=
nd/or they could also be &quot;home brew&quot; versions therein?=A0 Its pos=
sible that<br>
the pen motors themselves may be absent from, or short per the quanity of d=
rums?=A0 The thermal paper used is also very expensive.=A0 <br>Just a cauti=
onary buyer/bidder note. =A0 I&#39;ve been a visitor to the NEIC a few time=
s over the years and these problems were mentioned a<br>
few times from a variety of folks there.=A0=A0 No; I am not bidding on the =
lot.<br><br>Take care, Meredith Lamb<br><br>=A0 =A0=A0 <br>

Subject: Re: Seismic detector with AIS326DQ
From: alexander mirabal  alexmirabal2000@........ 
Date: Fri, 24 Apr 2009 01:07:34 +0000 (GMT)

Hi Chris,
=A0
Thank you very much for your helpful comments!
=A0
Yes, your explanation have definetly made me see=A0that noise is a fact I h=
ave to deal with using external filtering, tuned based on real response obt=
ained from this environment, that is very noisy. An important part of this =
city is contructed on what was a lake before the spaniard conquest. It is v=
ery common here to feel on building's structure the vibrations produced by =
trucks or buses on the street.=20
=A0
Electronics is not a problem at all,=A0and=A0I advance some experimentation=
 will be needed, particulary to choose the correct useful band of the filte=
rs. The 3 axis accelerometer board block diagram=A0is a good start point re=
ference for me, but I feel (just that, because I insist I have no practical=
 criteria in this matter) the 20Hz cut off frequency is too high.=A0The vib=
ration produced by trucks or busses on=A0buildings looks to me lower in fre=
quency, but the experimentation will say..!
=A0
I will try to get the 3052 sensors and go on with my own design of the filt=
er/amps and microcontroller interface, and=A0once I have some results, will=
 be glad to share them with the forum.
=A0
Many thanks again,
=A0
Alexander

--- El jue, 23/4/09, ChrisAtUpw@....... <ChrisAtUpw@.......> escribi=F3:


De: ChrisAtUpw@....... <ChrisAtUpw@.......>
Asunto: Re: Seismic detector with AIS326DQ
Para: psn-l@..............
Fecha: jueves, 23 abril, 2009 5:39



In a message dated 22/04/2009, alexmirabal2000@........ writes:

I need to build a device that alarms when a seism takes place, preferably i=
n an early state, let's say, for being used in public buildings or schools.=
 It is not intended to measure and record the magnitude of the earth moveme=
nt at all, just detect once it reaches certain level in any of the 3 axis a=
nd activate a sound/visual indication.
=A0
As a first approximation, I was taking a look to this IC: AIS326DQ http://w=
ww.st.com/stonline/products/literature/ds/14956/ais326dq.pdf, but honestly =
I have no practical criteria to determine in advance=A0if it sensitive enou=
gh for my purpose.=A0 The manufacturer web page mentions it is for automoti=
ve applications, but my feeling is that the accelerations changes in such e=
nvironments are far beyond the ones I need to deal with.
Hi Alexander,
=A0
=A0=A0=A0=A0If you look at the data sheet, the minimum detection level is 1=
 milli g and you only have a 12 bit ADC. These MEMs devices do not have the=
 high sensitivity, low noise and resolution that I would normally consider =
for seismic applications. They use 3.3V supplies and low level digital outp=
uts, not 5V. There is NO low pass filter to remove noise.
=A0
=A0=A0=A0=A0You still have to take measurements in the real world, with all=
=A0the environmental background noise that this entails.=20
=A0
=A0=A0=A0=A0See the comments about noise and drift at http://psn.quake.net/=
strongmotion.html
=A0
=A0=A0=A0=A0Larry does offer a triaxial sensor board http://psn.quake.net/p=
snaccel/

In case you consider it not suitable for this application, could any of you=
, please, recommend some other chip?
=A0=A0=A0=A0Not really. However, you can make a sensitive detector using a =
44 mm OD piezo disk from www.digikey.com such as 102-1170-ND @ $1.62 each w=
ith added load weights, but you do have to produce all the electronics, fil=
ters and an ADC. This is quite a lot of work. How good are you at designing=
 / building electronics?=20
=A0
=A0=A0=A0=A0I use similar discs in flex bending mode, not as a loaded drum.=
 You can also buy high capacity disks already mounted in plastic cases, but=
 their output is nearly square law, not linear like a simple flex disk. The=
 flex disk that I use gives over 5x the voltage output of a 4.5 Hz L15B geo=
phone see http://psn.quake.net/geophone/index.html=A0and the setup can go d=
own to 10 seconds period. Note that you may want to detect P and S waves fr=
om 0.5 Hz to 5 Hz.=20
=A0
=A0=A0=A0=A0Let me know if you want any further help?

I am located in Mexico City.

=A0=A0=A0=A0Regards,
=A0
=A0=A0=A0=A0Chris Chapman in UK=0A=0A=0A      
<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;"><DIV>Hi Chris,</DIV>
<DIV>&nbsp;</DIV>
<DIV>Thank you very much for your helpful comments!</DIV>
<DIV>&nbsp;</DIV>
<DIV>Yes, your explanation have definetly made me see&nbsp;that noise is a =
fact I have to deal with using external filtering, tuned based on real resp=
onse obtained from this environment, that is very noisy. An important part =
of this city is contructed on what was a lake before the spaniard conquest.=
 It is very common here to feel on building's structure the vibrations prod=
uced by trucks or buses on the street. </DIV>
<DIV>&nbsp;</DIV>
<DIV>Electronics is not a problem at all,&nbsp;and&nbsp;I advance some expe=
rimentation will be needed, particulary to choose the correct useful band o=
f the filters. The 3 axis accelerometer board block diagram&nbsp;is a good =
start point reference for me, but I feel (just that, because I insist I hav=
e no practical criteria in this matter) the 20Hz cut off frequency is too h=
igh.&nbsp;The vibration produced by trucks or busses on&nbsp;buildings look=
s to me lower in frequency, but the experimentation will say..!</DIV>
<DIV>&nbsp;</DIV>
<DIV>I will try to get the 3052 sensors and go on with my own design of the=
 filter/amps and microcontroller interface, and&nbsp;once I have some resul=
ts, will be glad to share them with the forum.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Many thanks again,</DIV>
<DIV>&nbsp;</DIV>
<DIV>Alexander<BR><BR>--- El <B>jue, 23/4/09, ChrisAtUpw@....... <I>&lt;Chr=
isAtUpw@.......&gt;</I></B> escribi=F3:<BR></DIV>
<BLOCKQUOTE style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(=
16,16,255) 2px solid"><BR>De: ChrisAtUpw@....... &lt;ChrisAtUpw@.......&gt;=
<BR>Asunto: Re: Seismic detector with AIS326DQ<BR>Para: psn-l@..............
m<BR>Fecha: jueves, 23 abril, 2009 5:39<BR><BR>
<DIV id=3Dyiv438829654><FONT id=3Drole_document face=3DArial color=3D#00000=
0 size=3D2>
<DIV>In a message dated 22/04/2009, alexmirabal2000@........ writes:</DIV>
<BLOCKQUOTE style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue=
 2px solid"><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial colo=
r=3D#000000>
<DIV>I need to build a device that alarms when a seism takes place, prefera=
bly in an early state, let's say, for being used in public buildings or sch=
ools. It is not intended to measure and record the magnitude of the earth m=
ovement at all, just detect once it reaches certain level in any of the 3 a=
xis and activate a sound/visual indication.</DIV>
<DIV>&nbsp;</DIV>
<DIV>As a first approximation, I was taking a look to this IC: AIS326DQ <A =
title=3Dhttp://www.st.com/stonline/products/literature/ds/14956/ais326dq.pd=
f href=3D"http://www.st.com/stonline/products/literature/ds/14956/ais326dq.=
pdf" target=3D_blank rel=3Dnofollow>http://www.st.com/stonline/products/lit=
erature/ds/14956/ais326dq.pdf</A>, but honestly I have no practical criteri=
a to determine in advance&nbsp;if it sensitive enough for my purpose.&nbsp;=
 The manufacturer web page mentions it is for automotive applications, but =
my feeling is that the accelerations changes in such environments are far b=
eyond the ones I need to deal with.</FONT></DIV></BLOCKQUOTE>
<DIV>Hi Alexander,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;If you look at the data sheet, the minimum det=
ection level is 1 milli g and you only have a 12 bit ADC. These MEMs device=
s do not have the high sensitivity, low noise and resolution that I would n=
ormally consider for seismic applications. They use 3.3V supplies and low l=
evel digital outputs, not 5V. There is NO low pass filter to remove noise.<=
/DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You still have to take measurements in the rea=
l world, with all&nbsp;the environmental background noise that this entails=
.. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;See the comments about noise and drift at <A h=
ref=3D"http://psn.quake.net/strongmotion.html" target=3D_blank rel=3Dnofoll=
ow>http://psn.quake.net/strongmotion.html</A></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Larry does offer a triaxial sensor board <A hr=
ef=3D"http://psn.quake.net/psnaccel/" target=3D_blank rel=3Dnofollow>http:/=
/psn.quake.net/psnaccel/</A></DIV>
<BLOCKQUOTE style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue=
 2px solid"><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial colo=
r=3D#000000>
<DIV>In case you consider it not suitable for this application, could any o=
f you, please, recommend some other chip?</FONT></DIV></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Not really. However, you can make a sensitive =
detector using a 44 mm OD piezo disk from <A href=3D"http://www.digikey.com=
/" target=3D_blank rel=3Dnofollow>www.digikey.com</A> such as 102-1170-ND @=
 $1.62 each with added load weights, but you do have to produce all the ele=
ctronics, filters and an ADC. This is quite a lot of work. How good are you=
 at designing / building electronics? </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I use similar discs in flex bending mode, not =
as a loaded drum. You can also buy high capacity disks already mounted in p=
lastic cases, but their output is nearly square law, not linear like a simp=
le flex disk. The flex disk that I use gives over 5x the voltage output of =
a 4.5 Hz L15B geophone see <A href=3D"http://psn.quake.net/geophone/index.h=
tml" target=3D_blank rel=3Dnofollow>http://psn.quake.net/geophone/index.htm=
l</A>&nbsp;and the setup can go down to 10 seconds period. Note that you ma=
y want to detect P and S waves from 0.5 Hz to 5 Hz. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Let me know if you want any further help?</DIV=
>
<BLOCKQUOTE style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue=
 2px solid"><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial colo=
r=3D#000000>
<DIV>I am located in Mexico City.</DIV></FONT></BLOCKQUOTE>
<DIV></DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman in UK</DIV></FONT></DIV></BLOCKQ=
UOTE></td></tr></table><br>=0A=0A=0A=0A      

Subject: Re: Large Lot GEOTECH Earthquake Measuring Seismology Equip
From: "Geoffrey"  gmvoeth@........... 
Date: Thu, 23 Apr 2009 20:18:51 -0700

When the Government Sells its old things
they are usually very obsolete.
And they should be Surveyed ( not sure what that means )
but surveyed should be written or stamped on all those devices.
This insures its not been stolen or whatever.
Shipping 6000 lbs would be the greatest expense I should imagine.

----- Original Message ----- 
From: "meredith lamb" <paleoartifact@.........>
To: <psn-l@..............>
Sent: Thursday, April 23, 2009 7:49 AM
Subject: Re: Large Lot GEOTECH Earthquake Measuring Seismology Equip


> On Thu, Apr 23, 2009 at 6:46 AM, <mongo@.........> wrote:
> 
>> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=200334607108
>>
>> Hi again;
>>
> 
> One more note on this lot.  Historically I do know that the thermal pens
> used on these drums were a constant problem in being
> either accidentally physically damaged or from occasional pen motor fast
> response driven normal use damage.  Even many years ago they were
> very expensive to obtain.  It wasn't unusual for such to be stripped from
> unused equipment to be used.  I only noted one pen in the Ebay
> photo's.  In short....the buyer "may" not get all the pens; and/or they
> could also be "home brew" versions therein?  Its possible that
> the pen motors themselves may be absent from, or short per the quanity of
> drums?  The thermal paper used is also very expensive.
> Just a cautionary buyer/bidder note.   I've been a visitor to the NEIC a few
> times over the years and these problems were mentioned a
> few times from a variety of folks there.   No; I am not bidding on the lot.
> 
> Take care, Meredith Lamb
>
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Pen needed for Kinemetrics PS2
From: "Kareem Lanier"  system98765@............. 
Date: Sat, 25 Apr 2009 10:03:50 -0700

I have a question regarding this system. IT's a kinemetrics PS2 system and I
need a new pen for it. I can't seem to get a new pen from any viable
sources. The manufacturer wants to charge an enormous amount of money. I
wasn't sure if anyone knew how to make one or point me in that direction. It
just looks like a metal tube (very, very small) that has a bend in it so
that makes contact with the paper.

Kareem 





------------------
Kareem J. Lanier
El Sobrante, California (N37.96 W122.32)
East Bay Area Region

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Pen needed for Kinemetrics PS2
From: "Kareem Lanier"  system98765@............. 
Date: Sat, 25 Apr 2009 10:04:34 -0700

 I forgot to include the link to my system:
http://peculiarvelocity.files.wordpress.com/2008/10/800px-kinemetrics_seismo
graph.jpg


-----Original Message-----
From: Kareem Lanier [mailto:system98765@.............. 
Sent: Saturday, April 25, 2009 10:04 AM
To: 'psn-l@...............
Subject: Pen needed for Kinemetrics PS2

I have a question regarding this system. IT's a kinemetrics PS2 system and I
need a new pen for it. I can't seem to get a new pen from any viable
sources. The manufacturer wants to charge an enormous amount of money. I
wasn't sure if anyone knew how to make one or point me in that direction. It
just looks like a metal tube (very, very small) that has a bend in it so
that makes contact with the paper.

Kareem 





------------------
Kareem J. Lanier
El Sobrante, California (N37.96 W122.32) East Bay Area Region

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re:  Pen needed for Kinemetrics PS2
From: "Geoffrey"  gmvoeth@........... 
Date: Sat, 25 Apr 2009 10:53:35 -0700

FILE NOT FOUND.


----- Original Message ----- 
From: "Kareem Lanier" <system98765@.............>
To: <psn-l@..............>
Sent: Saturday, April 25, 2009 10:04 AM
Subject: Pen needed for Kinemetrics PS2


> I forgot to include the link to my system:
> http://peculiarvelocity.files.wordpress.com/2008/10/800px-kinemetrics_seismo
> graph.jpg
> 
> 
> -----Original Message-----
> From: Kareem Lanier [mailto:system98765@.............. 
> Sent: Saturday, April 25, 2009 10:04 AM
> To: 'psn-l@...............
> Subject: Pen needed for Kinemetrics PS2
> 
> I have a question regarding this system. IT's a kinemetrics PS2 system and I
> need a new pen for it. I can't seem to get a new pen from any viable
> sources. The manufacturer wants to charge an enormous amount of money. I
> wasn't sure if anyone knew how to make one or point me in that direction. It
> just looks like a metal tube (very, very small) that has a bend in it so
> that makes contact with the paper.
> 
> Kareem 
> 
> 
> 
> 
> 
> ------------------
> Kareem J. Lanier
> El Sobrante, California (N37.96 W122.32) East Bay Area Region
> 
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Pen needed for Kinemetrics PS2
From: ChrisAtUpw@.......
Date: Sat, 25 Apr 2009 14:03:24 EDT

 
In a message dated 25/04/2009, system98765@............. writes:

IT's a  kinemetrics PS2 system and I need a new pen for it. I can't seem to 
get a new  pen from any viable sources. The manufacturer wants to charge an 
enormous  amount of money. I wasn't sure if anyone knew how to make one or 
point me in  that direction. It just looks like a metal tube (very, very 
small) that has a  bend in it so that makes contact with the paper.



Hi Kareem,
 
    What is the matter with your existing pen? You can  buy a special 
cleaning fluid for capillary pens. You can also buy fine wire  for cleaning out 
small tubes. I usually use fine piano wire or hard Nichrome  wire, ground to 
a diagonal knife end. If you have a problem in getting cleaning  fluid, look 
for paint stripper fluid containing Methylene Chloride.
    I can buy very small bore SS tube quite easily.  What is the OD of your 
existing tube? 
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 25/04/2009, system98765@............. writes:</DIV=
>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>IT's a 
  kinemetrics PS2 system and I need a new pen for it. I can't seem to get=
 a new 
  pen from any viable sources. The manufacturer wants to charge an enormou=
s 
  amount of money. I wasn't sure if anyone knew how to make one or point=
 me in 
  that direction. It just looks like a metal tube (very, very small) that=
 has a 
  bend in it so that makes contact with the paper.<BR></FONT></BLOCKQUOTE>=
</DIV>
<DIV></DIV>
<DIV>Hi Kareem,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;What is the matter with your existing pen? Yo=
u can 
buy a special cleaning fluid for capillary pens. You can also&nbsp;buy fin=
e wire 
for cleaning out small tubes. I usually use fine piano wire or hard Nichro=
me 
wire, ground to a diagonal knife end. If you have a problem in getting cle=
aning 
fluid, look for paint stripper fluid containing Methylene Chloride.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I can buy very small bore SS tube quite easil=
y. 
What is the OD of your existing tube? </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: RE: Pen needed for Kinemetrics PS2
From: "Gary Lindgren"  gel@................. 
Date: Sat, 25 Apr 2009 11:24:28 -0700

Geoffrey,

Try this
http://peculiarvelocity.files.wordpress.com/2008/10/800px-kinemetrics_seismo
graph.jpg 

Gary




-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Geoffrey
Sent: Saturday, April 25, 2009 10:54 AM
To: psn-l@..............
Subject: Re: Pen needed for Kinemetrics PS2

FILE NOT FOUND.


----- Original Message ----- 
From: "Kareem Lanier" <system98765@.............>
To: <psn-l@..............>
Sent: Saturday, April 25, 2009 10:04 AM
Subject: Pen needed for Kinemetrics PS2


> I forgot to include the link to my system:
>
http://peculiarvelocity.files.wordpress.com/2008/10/800px-kinemetrics_seismo
> graph.jpg
> 
> 
> -----Original Message-----
> From: Kareem Lanier [mailto:system98765@.............. 
> Sent: Saturday, April 25, 2009 10:04 AM
> To: 'psn-l@...............
> Subject: Pen needed for Kinemetrics PS2
> 
> I have a question regarding this system. IT's a kinemetrics PS2 system and
I
> need a new pen for it. I can't seem to get a new pen from any viable
> sources. The manufacturer wants to charge an enormous amount of money. I
> wasn't sure if anyone knew how to make one or point me in that direction.
It
> just looks like a metal tube (very, very small) that has a bend in it so
> that makes contact with the paper.
> 
> Kareem 
> 
> 
> 
> 
> 
> ------------------
> Kareem J. Lanier
> El Sobrante, California (N37.96 W122.32) East Bay Area Region
> 
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Pen needed for Kinemetrics PS2
From: Ben Bradley  benbradley@........... 
Date: Sat, 25 Apr 2009 16:08:08 -0400

Gary Lindgren wrote:
> Geoffrey,
>
> Try this
> http://peculiarvelocity.files.wordpress.com/2008/10/800px-kinemetrics_seismo
> graph.jpg 
>   

   Both links "wrap" for me, taking up two lines thus breaking the URL, 
but I know how to magically copy-and-paste the parts together into the 
address bar of my browser. It's also easy enough to make a much shorter 
link at http://tinyurl.com - the following link goes to the pic:

http://tinyurl.com/cuxmsn

> Gary
>
>
>
>
> -----Original Message-----
> From: psn-l-request@.............. [mailto:psn-l-request@............... On
> Behalf Of Geoffrey
> Sent: Saturday, April 25, 2009 10:54 AM
> To: psn-l@..............
> Subject: Re: Pen needed for Kinemetrics PS2
>
> FILE NOT FOUND.
>
>
> ----- Original Message ----- 
> From: "Kareem Lanier" <system98765@.............>
> To: <psn-l@..............>
> Sent: Saturday, April 25, 2009 10:04 AM
> Subject: Pen needed for Kinemetrics PS2
>
>
>   
>> I forgot to include the link to my system:
>>
>>     
> http://peculiarvelocity.files.wordpress.com/2008/10/800px-kinemetrics_seismo
>   
>> graph.jpg
>>
>>
>> -----Original Message-----
>> From: Kareem Lanier [mailto:system98765@.............. 
>> Sent: Saturday, April 25, 2009 10:04 AM
>> To: 'psn-l@...............
>> Subject: Pen needed for Kinemetrics PS2
>>
>> I have a question regarding this system. IT's a kinemetrics PS2 system and
>>     
> I
>   
>> need a new pen for it. I can't seem to get a new pen from any viable
>> sources. The manufacturer wants to charge an enormous amount of money. I
>> wasn't sure if anyone knew how to make one or point me in that direction.
>>     
> It
>   
>> just looks like a metal tube (very, very small) that has a bend in it so
>> that makes contact with the paper.
>>
>> Kareem 
>>
>>
>>
>>
>>
>> ------------------
>> Kareem J. Lanier
>> El Sobrante, California (N37.96 W122.32) East Bay Area Region
>>
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with 
>> the body of the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>
>>     
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>   

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Pen needed for Kinemetrics PS2
From: "Geoffrey"  gmvoeth@........... 
Date: Sat, 25 Apr 2009 21:47:54 -0700

Nifty ! that's like the big boys use.

----- Original Message ----- 
From: "Ben Bradley" <benbradley@...........>
To: <psn-l@..............>
Sent: Saturday, April 25, 2009 1:08 PM
Subject: Re: Pen needed for Kinemetrics PS2


> Gary Lindgren wrote:
>> Geoffrey,
>>
>> Try this
>> http://peculiarvelocity.files.wordpress.com/2008/10/800px-kinemetrics_seismo
>> graph.jpg 
>>   
> 
>   Both links "wrap" for me, taking up two lines thus breaking the URL, 
> but I know how to magically copy-and-paste the parts together into the 
> address bar of my browser. It's also easy enough to make a much shorter 
> link at http://tinyurl.com - the following link goes to the pic:
> 
> http://tinyurl.com/cuxmsn
> 
>> Gary
>>
>>
>>
>>
>> -----Original Message-----
>> From: psn-l-request@.............. [mailto:psn-l-request@............... On
>> Behalf Of Geoffrey
>> Sent: Saturday, April 25, 2009 10:54 AM
>> To: psn-l@..............
>> Subject: Re: Pen needed for Kinemetrics PS2
>>
>> FILE NOT FOUND.
>>
>>
>> ----- Original Message ----- 
>> From: "Kareem Lanier" <system98765@.............>
>> To: <psn-l@..............>
>> Sent: Saturday, April 25, 2009 10:04 AM
>> Subject: Pen needed for Kinemetrics PS2
>>
>>
>>   
>>> I forgot to include the link to my system:
>>>
>>>     
>> http://peculiarvelocity.files.wordpress.com/2008/10/800px-kinemetrics_seismo
>>   
>>> graph.jpg
>>>
>>>
>>> -----Original Message-----
>>> From: Kareem Lanier [mailto:system98765@.............. 
>>> Sent: Saturday, April 25, 2009 10:04 AM
>>> To: 'psn-l@...............
>>> Subject: Pen needed for Kinemetrics PS2
>>>
>>> I have a question regarding this system. IT's a kinemetrics PS2 system and
>>>     
>> I
>>   
>>> need a new pen for it. I can't seem to get a new pen from any viable
>>> sources. The manufacturer wants to charge an enormous amount of money. I
>>> wasn't sure if anyone knew how to make one or point me in that direction.
>>>     
>> It
>>   
>>> just looks like a metal tube (very, very small) that has a bend in it so
>>> that makes contact with the paper.
>>>
>>> Kareem 
>>>
>>>
>>>
>>>
>>>
>>> ------------------
>>> Kareem J. Lanier
>>> El Sobrante, California (N37.96 W122.32) East Bay Area Region
>>>
>>> __________________________________________________________
>>>
>>> Public Seismic Network Mailing List (PSN-L)
>>>
>>> To leave this list email PSN-L-REQUEST@.............. with 
>>> the body of the message (first line only): unsubscribe
>>> See http://www.seismicnet.com/maillist.html for more information.
>>>
>>>     
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with 
>> the body of the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with 
>> the body of the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>   
> 
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
__________________________________________________________

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Subject: RE: Pen needed for Kinemetrics PS2
From: "Kareem Lanier"  system98765@............. 
Date: Sun, 26 Apr 2009 07:58:40 -0700

Thanks for your replies..

I would love to get the cleaning fluid and wire. Where would one find such
materials? What's "OD?"
 

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of ChrisAtUpw@.......
Sent: Saturday, April 25, 2009 11:03 AM
To: psn-l@..............
Subject: Re: Pen needed for Kinemetrics PS2

In a message dated 25/04/2009, system98765@............. writes:

	IT's a kinemetrics PS2 system and I need a new pen for it. I can't
seem to get a new pen from any viable sources. The manufacturer wants to
charge an enormous amount of money. I wasn't sure if anyone knew how to make
one or point me in that direction. It just looks like a metal tube (very,
very small) that has a bend in it so that makes contact with the paper.
	

Hi Kareem,
 
    What is the matter with your existing pen? You can buy a special
cleaning fluid for capillary pens. You can also buy fine wire for cleaning
out small tubes. I usually use fine piano wire or hard Nichrome wire, ground
to a diagonal knife end. If you have a problem in getting cleaning fluid,
look for paint stripper fluid containing Methylene Chloride.
    I can buy very small bore SS tube quite easily. What is the OD of your
existing tube? 
 
    Regards,
 
    Chris Chapman

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: How to post helicorder online
From: "tchannel"  tchannel@............ 
Date: Sun, 26 Apr 2009 10:00:43 -0600

Hi Folks,  I know many of you post your helicorder (screen shots) online =
for others to see.   In the past I could not do this because I only had =
a dial up modem. I now have broad band.
 Could someone explain how I can do this?
Thanks, Ted
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>Hi Folks,&nbsp; I know many of you post =
your=20
helicorder (screen shots) online for others to see.&nbsp;&nbsp; In the =
past I=20
could not do this because I only had a dial up modem.&nbsp;I now have =
broad=20
band.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>&nbsp;Could someone explain how I can =
do=20
this?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Thanks, Ted</FONT></DIV></BODY></HTML>

Subject: Re: How to post helicorder online
From: "Geoffrey"  gmvoeth@........... 
Date: Sun, 26 Apr 2009 16:07:50 -0700

1. Your Own ISP has a personal Web Page You can use.
2. Binary Newsgroups can be posted to and your
   ISP probably has one you need a special program to
   post with and its not easy to learn how to do it.
   involves things like BINHEX and/or Yenc or Mime.
3. Use a free BLOG web site.
4. Free file sharing ( but you must join or register )
5. Peer to Peer which used to be called Kazaa
   and might now be bit torrent.

----- Original Message ----- 
From: "tchannel" <tchannel@............>
To: "psn" <psn-l@..............>
Sent: Sunday, April 26, 2009 9:00 AM
Subject: How to post helicorder online


Hi Folks,  I know many of you post your helicorder (screen shots) online for others to see.   In the past I could not do this 
because I only had a dial up modem. I now have broad band.
 Could someone explain how I can do this?
Thanks, Ted 

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: How to post helicorder online
From: "Geoffrey"  gmvoeth@........... 
Date: Sun, 26 Apr 2009 16:15:43 -0700

My Favorite way ( Which is forbidden by some ISPs
unless you pay out the yin-yang )
is to buy a FTP server and allow your buddies
or girl friends or whatever to download directly
from your own machine.

----- Original Message ----- 
From: "tchannel" <tchannel@............>
To: "psn" <psn-l@..............>
Sent: Sunday, April 26, 2009 9:00 AM
Subject: How to post helicorder online


Hi Folks,  I know many of you post your helicorder (screen shots) online for others to see.   In the past I could not do this 
because I only had a dial up modem. I now have broad band.
 Could someone explain how I can do this?
Thanks, Ted 

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: How to post helicorder online
From: "Kay Wyatt"  kwyatt@............. 
Date: Sun, 26 Apr 2009 16:56:35 -0700

Ted,

Congrats on the broad band!

Below is a link that describes how to upload your helicorder images for =
near real time display.  In the document, we describe how to upload it =
to the IRIS Seismographs in Schools website.  But you can just =
substitute your own web page location.  This method uses an inexpensive =
software product called "SnagIt" which seems to work as well as any =
other.
http://www.iris.edu/hq/files/sis/documents/snagit_install_and_setup.pdf

I use this method for my helicorder image at
http://oregonshakes.com/Seismographs/LWC/LWCseis.html
If you use Internet Explorer you can select Page=3D=3D>View source to =
see how it automatically refreshes the page every 10 minutes.  The =
following HTML will do the trick:

<meta http-equiv=3D"Refresh" content=3D"600">
<meta http-equiv=3D"pragma" content=3D"no-cache">
<meta http-equiv=3D"expires" content=3D"-1">

Kay Wyatt





  ----- Original Message -----=20
  From: tchannel=20
  To: psn=20
  Sent: Sunday, April 26, 2009 9:00 AM
  Subject: How to post helicorder online


  Hi Folks,  I know many of you post your helicorder (screen shots) =
online for others to see.   In the past I could not do this because I =
only had a dial up modem. I now have broad band.
   Could someone explain how I can do this?
  Thanks, Ted
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV>Ted,</DIV>
<DIV>&nbsp;</DIV>
<DIV>Congrats on the broad band!</DIV>
<DIV>&nbsp;</DIV>
<DIV>Below is a link that describes how to upload your helicorder images =
for=20
near real time display.&nbsp; In the document, we describe how to upload =
it to=20
the IRIS Seismographs in Schools website.&nbsp; But you can just =
substitute your=20
own web page location.&nbsp; This method uses an inexpensive software =
product=20
called "SnagIt" which seems to work as well as any other.</DIV>
<DIV><A=20
href=3D"http://www.iris.edu/hq/files/sis/documents/snagit_install_and_set=
up.pdf">http://www.iris.edu/hq/files/sis/documents/snagit_install_and_set=
up.pdf</A></DIV>
<DIV>&nbsp;</DIV>
<DIV>I use this method for my helicorder image at</DIV>
<DIV><A=20
href=3D"http://oregonshakes.com/Seismographs/LWC/LWCseis.html">http://ore=
gonshakes.com/Seismographs/LWC/LWCseis.html</A></DIV>
<DIV>If you use Internet Explorer you can select Page=3D=3D&gt;View =
source to see=20
how it automatically refreshes the page every 10 minutes.&nbsp; The =
following=20
HTML will do the trick:</DIV>
<DIV>&nbsp;</DIV>
<DIV>&lt;meta http-equiv=3D"Refresh" content=3D"600"&gt;<BR>&lt;meta=20
http-equiv=3D"pragma" content=3D"no-cache"&gt;<BR>&lt;meta =
http-equiv=3D"expires"=20
content=3D"-1"&gt;</DIV>
<DIV>&nbsp;</DIV>
<DIV>Kay Wyatt</DIV>
<DIV>&nbsp;</DIV>
<DIV>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
style=3D"mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P>
<P class=3DMsoNormal style=3D"MARGIN: 0in 0in 0pt"><SPAN=20
style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Arial"><SPAN=20
style=3D"mso-spacerun: yes"></SPAN></SPAN>&nbsp;</P></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Dtchannel@...............
  href=3D"mailto:tchannel@............">tchannel</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, April 26, 2009 =
9:00=20
AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> How to post helicorder =

  online</DIV>
  <DIV><BR></DIV>
  <DIV><FONT face=3DArial size=3D2>Hi Folks,&nbsp; I know many of you =
post your=20
  helicorder (screen shots) online for others to see.&nbsp;&nbsp; In the =
past I=20
  could not do this because I only had a dial up modem.&nbsp;I now have =
broad=20
  band.</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2>&nbsp;Could someone explain how I can =
do=20
  this?</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2>Thanks, =
Ted</FONT></DIV></BLOCKQUOTE></BODY></HTML>

Subject: Re: How to post helicorder online
From: Thomas Dick  dickthomas01@............. 
Date: Sun, 26 Apr 2009 21:16:10 -0500

There are many ways to post on Internet. I occasionally post to Face 
book for my sons and certain selected outsiders to see a particular 
earthquake. I use Infraview to capture the screen, crop it a little and 
save it. I simple attach it to an email or post it directly into Face 
book. I have used Snag it. It works. You can then upload to a web site. 
That doesn't appeal to me because of the inherent delay that exists.... 
maybe to you. Most internet providers provide some space for you to have 
a website with reasonable memory. There are many programs that will help 
you to create a site; most are free ...  or, it could be done with 
Microsoft Publisher if you have it. WinQuake allows almost automatic 
posting to the PSN network. I settled on a program called VNC (also 
free) because it allows me to access my computer that is running WinSDR 
and recording the data when I am away from the home location. It is a 
what you see is what you get program. You can put security (firewalls) 
up if you feel threaten by external accessing of your home repeater. I 
can do anything away from home that I would do at home as long as I have 
a good WiFi access. And speed isn't that big an issue. My laptop is only 
about 1 ghz speed. The home router runs at 24 mhz and the broad band 
connection runs over 10 ghz. Most of the time,  the  Wifi  receiving 
unit is the problem; weak signal, , angle of sun or bad weather, too 
many on it at one time, things like that. I have occasionally "stolen" 
access at some motels ... by just pulling into their parking lot.
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: How to post helicorder online
From: Robert McClure  bobmcclure90@......... 
Date: Sun, 26 Apr 2009 22:33:54 -0400

  For uploading real-time helicorder displays to your web site, see
the following web page:

http://www.jclahr.com/science/psn/as1/index.html

How to create a real-time helicorder display for the Internet using SnagIt.
How to create a real-time helicorder display for the Internet using MWSnap

On 4/26/09, Thomas Dick <dickthomas01@.............> wrote:
> There are many ways to post on Internet. I occasionally post to Face
> book for my sons and certain selected outsiders to see a particular
> earthquake. I use Infraview to capture the screen, crop it a little and
> save it. I simple attach it to an email or post it directly into Face
> book. I have used Snag it. It works. You can then upload to a web site.
> That doesn't appeal to me because of the inherent delay that exists....
> maybe to you. Most internet providers provide some space for you to have
> a website with reasonable memory. There are many programs that will help
> you to create a site; most are free ...  or, it could be done with
> Microsoft Publisher if you have it. WinQuake allows almost automatic
> posting to the PSN network. I settled on a program called VNC (also
> free) because it allows me to access my computer that is running WinSDR
> and recording the data when I am away from the home location. It is a
> what you see is what you get program. You can put security (firewalls)
> up if you feel threaten by external accessing of your home repeater. I
> can do anything away from home that I would do at home as long as I have
> a good WiFi access. And speed isn't that big an issue. My laptop is only
> about 1 ghz speed. The home router runs at 24 mhz and the broad band
> connection runs over 10 ghz. Most of the time,  the  Wifi  receiving
> unit is the problem; weak signal, , angle of sun or bad weather, too
> many on it at one time, things like that. I have occasionally "stolen"
> access at some motels ... by just pulling into their parking lot.
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: How to post helicorder online
From: "Randy Pratt"  rpratt@............. 
Date: Mon, 27 Apr 2009 09:44:27 -0400

Ted,
Bob already mentioned the method "How to create a real-time helicorder
display for the Internet using MWSnap" from John Lahr's web site.  This
works great for AmaSeis but it requires keeping the AmaSeis window open and
is limited to one channel.  If you use Bob's Helicorder program the program
will create its own images periodically and you do not need Snaggit or
MWSnap to capture the various windows.  The images created by each
Helicorder channel can be combined and converted to gif format using Image
Magic.  Then upload by referring back to John's instructions.  Image Magic
and the FTP program are free on the GNU license.  By not using screen
capture you do not need to worry about personal information accidently being
captured and uploaded.

Randy


----- ------ ------ ------ ------ ------ ------ ------ ------ ------.
> | Message 2                                                           |
> '------ ------ ------ ------ ------ ------ ------ ------ ------ ------'
> Subject: How to post helicorder online
> From:    "tchannel" <tchannel@............>
> Date:    Sun, 26 Apr 2009 10:00:43 -0600
>
> This is a multi-part message in MIME format.
>
> ------=_NextPart_000_001A_01C9C655.DC945C00
> Content-Type: text/plain;
> charset="iso-8859-1"
> Content-Transfer-Encoding: quoted-printable
>
> Hi Folks,  I know many of you post your helicorder (screen shots) online =
> for others to see.   In the past I could not do this because I only had =
> a dial up modem. I now have broad band.
>  Could someone explain how I can do this?
> Thanks, Ted
>

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: How to post helicorder online
From: Robert McClure  bobmcclure90@......... 
Date: Mon, 27 Apr 2009 20:48:48 -0400

Hi Ted and Randy,

  My Heliscroll real-time helicorder display program is intended for
use only with Dataq Data Acquisition type WDQ files. Larry Cochrane
has a similar program for use with his SDR software, I believe.

  I hope that Don Wheeler of http://www.teleseismic.net can join this
discussion and clue us in on how he displays real-time plots.

Bob
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: How to post helicorder online
From: Barry Lotz  barry_lotz@............. 
Date: Mon, 27 Apr 2009 19:32:20 -0700 (PDT)

Thomas
I use Tight VNC at home between my computer in the house and the sensor computer in the garage(same network). I tried to use the same server address from the garage from my work computer and could not connect. How did you determine the server address for your sensor when you are at a different location? Could my problem be a firewall issue?
Regards
Barry


--- On Sun, 4/26/09, Thomas Dick <dickthomas01@.............> wrote:
From: Thomas Dick <dickthomas01@.............>
Subject: Re: How to post helicorder online
To: psn-l@..............
Date: Sunday, April 26, 2009, 7:16 PM

There are many ways to post on Internet. I occasionally post to Face book for my
sons and certain selected outsiders to see a particular earthquake. I use
Infraview to capture the screen, crop it a little and save it. I simple attach
it to an email or post it directly into Face book. I have used Snag it. It
works. You can then upload to a web site. That doesn't appeal to me because
of the inherent delay that exists.... maybe to you. Most internet providers
provide some space for you to have a website with reasonable memory. There are
many programs that will help you to create a site; most are free ...  or, it
could be done with Microsoft Publisher if you have it. WinQuake allows almost
automatic posting to the PSN network. I settled on a program called VNC (also
free) because it allows me to access my computer that is running WinSDR and
recording the data when I am away from the home location. It is a what you see
is what you get program. You can put security (firewalls) up if you feel
threaten by external accessing of your home repeater. I can do anything away
from home that I would do at home as long as I have a good WiFi access. And
speed isn't that big an issue. My laptop is only about 1 ghz speed. The home
router runs at 24 mhz and the broad band connection runs over 10 ghz. Most of
the time,  the  Wifi  receiving unit is the problem; weak signal, , angle of sun
or bad weather, too many on it at one time, things like that. I have
occasionally "stolen" access at some motels ... by just pulling into
their parking lot.

<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Thomas<br>I use Tight VNC at home between my computer in the house and the sensor computer in the garage(same network). I tried to use the same server address from the garage from my work computer and could not connect. How did you determine the server address for your sensor when you are at a different location? Could my problem be a firewall issue?<br>Regards<br>Barry<br><br><br>--- On <b>Sun, 4/26/09, Thomas Dick <i>&lt;dickthomas01@.............&gt;</i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;">From: Thomas Dick &lt;dickthomas01@.............&gt;<br>Subject: Re: How to post helicorder online<br>To: psn-l@..............<br>Date: Sunday, April 26, 2009, 7:16 PM<br><br><pre>There are many ways to post on Internet. I occasionally post to Face book for my<br>sons and certain selected outsiders
 to see a particular earthquake. I use<br>Infraview to capture the screen, crop it a little and save it. I simple attach<br>it to an email or post it directly into Face book. I have used Snag it. It<br>works. You can then upload to a web site. That doesn't appeal to me because<br>of the inherent delay that exists.... maybe to you. Most internet providers<br>provide some space for you to have a website with reasonable memory. There are<br>many programs that will help you to create a site; most are free ...  or, it<br>could be done with Microsoft Publisher if you have it. WinQuake allows almost<br>automatic posting to the PSN network. I settled on a program called VNC (also<br>free) because it allows me to access my computer that is running WinSDR and<br>recording the data when I am away from the home location. It is a what you see<br>is what you get program. You can put security (firewalls) up if you feel<br>threaten by external accessing of your home
 repeater. I can do anything away<br>from home that I would do at home as long as I have a good WiFi access. And<br>speed isn't that big an issue. My laptop is only about 1 ghz speed. The home<br>router runs at 24 mhz and the broad band connection runs over 10 ghz. Most of<br>the time,  the  Wifi  receiving unit is the problem; weak signal, , angle of sun<br>or bad weather, too many on it at one time, things like that. I have<br>occasionally "stolen" access at some motels ... by just pulling into<br>their parking lot.<br><br></pre></blockquote></td></tr></table>

Subject: RE: Pen needed for Kinemetrics PS2
From: Barry Lotz  barry_lotz@............. 
Date: Mon, 27 Apr 2009 19:38:25 -0700 (PDT)

Kareem
Someone told me years ago to add a little glycerin to the ink to increase the ink drying time and prevent clogging. I haven't tried it.
Regards
Barry


--- On Sun, 4/26/09, Kareem Lanier <system98765@.............> wrote:
From: Kareem Lanier <system98765@.............>
Subject: RE: Pen needed for Kinemetrics PS2
To: psn-l@..............
Date: Sunday, April 26, 2009, 7:58 AM

Thanks for your replies..

I would love to get the cleaning fluid and wire. Where would one find such
materials? What's "OD?"
 

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of ChrisAtUpw@.......
Sent: Saturday, April 25, 2009 11:03 AM
To: psn-l@..............
Subject: Re: Pen needed for Kinemetrics PS2

In a message dated 25/04/2009, system98765@............. writes:

	IT's a kinemetrics PS2 system and I need a new pen for it. I can't
seem to get a new pen from any viable sources. The manufacturer wants to
charge an enormous amount of money. I wasn't sure if anyone knew how to
make
one or point me in that direction. It just looks like a metal tube (very,
very small) that has a bend in it so that makes contact with the paper.
	

Hi Kareem,
 
    What is the matter with your existing pen? You can buy a special
cleaning fluid for capillary pens. You can also buy fine wire for cleaning
out small tubes. I usually use fine piano wire or hard Nichrome wire, ground
to a diagonal knife end. If you have a problem in getting cleaning fluid,
look for paint stripper fluid containing Methylene Chloride.
    I can buy very small bore SS tube quite easily. What is the OD of your
existing tube? 
 
    Regards,
 
    Chris Chapman

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Kareem<br>Someone told me years ago to add a little glycerin to the ink to increase the ink drying time and prevent clogging. I haven't tried it.<br>Regards<br>Barry<br><br><br>--- On <b>Sun, 4/26/09, Kareem <span>Lanier</span> <i>&lt;system98765@.............&gt;</i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;">From: Kareem Lanier &lt;system98765@.............&gt;<br>Subject: RE: Pen needed for Kinemetrics PS2<br>To: psn-l@..............<br>Date: Sunday, April 26, 2009, 7:58 AM<br><br><pre>Thanks for your replies..<br><br>I would love to get the cleaning fluid and wire. Where would one find such<br>materials? What's "OD?"<br> <br><br>-----Original Message-----<br>From: psn-l-request@.............. [mailto:psn-l-request@............... On<br>Behalf Of ChrisAtUpw@.......<br>Sent: Saturday, April
 25, 2009 11:03 AM<br>To: psn-l@..............<br>Subject: Re: Pen needed for Kinemetrics PS2<br><br>In a message dated 25/04/2009, system98765@............. writes:<br><br>	IT's a kinemetrics PS2 system and I need a new pen for it. I can't<br>seem to get a new pen from any viable sources. The manufacturer wants to<br>charge an enormous amount of money. I wasn't sure if anyone knew how to<br>make<br>one or point me in that direction. It just looks like a metal tube (very,<br>very small) that has a bend in it so that makes contact with the paper.<br>	<br><br>Hi Kareem,<br> <br>    What is the matter with your existing pen? You can buy a special<br>cleaning fluid for capillary pens. You can also buy fine wire for cleaning<br>out small tubes. I usually use fine piano wire or hard Nichrome wire, ground<br>to a diagonal knife end. If you have a problem in getting cleaning fluid,<br>look for paint stripper fluid containing Methylene Chloride.<br>    I can buy
 very small bore SS tube quite easily. What is the OD of your<br>existing tube? <br> <br>    Regards,<br> <br>    Chris Chapman<br><br>__________________________________________________________<br><br>Public Seismic Network Mailing List (PSN-L)<br><br>To leave this list email PSN-L-REQUEST@SEISMICNET.COM with <br>the body of the message (first line only): unsubscribe<br>See http://www.seismicnet.com/maillist.html for more information.<br></pre></blockquote></td></tr></table>

Subject: Re: Pen needed for Kinemetrics PS2
From: Pete Rowe  ptrowe@......... 
Date: Mon, 27 Apr 2009 21:16:19 -0700 (PDT)

Kareem
I have had good luck just soaking the pens for a few days in alcohol. Then run a fine wire through it. As I recall, I used a Violin "E" string for some old Esterline Angus pens. These are really steel wire and not string.You can get one at any music store. I don't know what the inside diameter of your pen is but an e string will be between 0.5 and 0.6 millimeters in diameter.
I hope this helps,
Pete

--- On Sat, 4/25/09, Kareem Lanier <system98765@.............> wrote:
From: Kareem Lanier <system98765@.............>
Subject: Pen needed for Kinemetrics PS2
To: psn-l@..............
Date: Saturday, April 25, 2009, 10:04 AM

 I forgot to include the link to my system:
http://peculiarvelocity.files.wordpress.com/2008/10/800px-kinemetrics_seismo
graph.jpg


-----Original Message-----
From: Kareem Lanier [mailto:system98765@.............. 
Sent: Saturday, April 25, 2009 10:04 AM
To: 'psn-l@...............
Subject: Pen needed for Kinemetrics PS2

I have a question regarding this system. IT's a kinemetrics PS2 system and
I
need a new pen for it. I can't seem to get a new pen from any viable
sources. The manufacturer wants to charge an enormous amount of money. I
wasn't sure if anyone knew how to make one or point me in that direction.
It
just looks like a metal tube (very, very small) that has a bend in it so
that makes contact with the paper.

Kareem 





------------------
Kareem J. Lanier
El Sobrante, California (N37.96 W122.32) East Bay Area Region

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)




      
<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Kareem<br>I have had good luck just soaking the pens for a few days in alcohol. Then run a fine wire through it. As I recall, I used a Violin "E" string for some old Esterline Angus pens. These are really steel wire and not string.You can get one at any music store. I don't know what the inside diameter of your pen is but an e string will be between 0.5 and 0.6 millimeters in diameter.<br>I hope this helps,<br>Pete<br><br>--- On <b>Sat, 4/25/09, Kareem Lanier <i>&lt;system98765@.............&gt;</i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;">From: Kareem Lanier &lt;system98765@.............&gt;<br>Subject: Pen needed for Kinemetrics PS2<br>To: psn-l@..............<br>Date: Saturday, April 25, 2009, 10:04 AM<br><br><pre> I forgot to include the link to my
 system:<br>http://peculiarvelocity.files.wordpress.com/2008/10/800px-kinemetrics_seismo<br>graph.jpg<br><br><br>-----Original Message-----<br>From: Kareem Lanier [mailto:system98765@.............. <br>Sent: Saturday, April 25, 2009 10:04 AM<br>To: 'psn-l@...............<br>Subject: Pen needed for Kinemetrics PS2<br><br>I have a question regarding this system. IT's a kinemetrics PS2 system and<br>I<br>need a new pen for it. I can't seem to get a new pen from any viable<br>sources. The manufacturer wants to charge an enormous amount of money. I<br>wasn't sure if anyone knew how to make one or point me in that direction.<br>It<br>just looks like a metal tube (very, very small) that has a bend in it so<br>that makes contact with the paper.<br><br>Kareem <br><br><br><br><br><br>------------------<br>Kareem J. Lanier<br>El Sobrante, California (N37.96 W122.32) East Bay Area Region<br><br>__________________________________________________________<br><br>Public
 Seismic Network Mailing List (PSN-L)<br><br>To leave this list email PSN-L-REQUEST@.............. with <br>the body of the message (first line only): unsubscribe<br>See http://www.seismicnet.com/maillist.html for more information.<br></pre></blockquote></td></tr></table><br>

      

Subject: Re: How to post helicorder online
From: Thomas Dick  dickthomas01@............. 
Date: Tue, 28 Apr 2009 10:13:05 -0500

Barry Lotz wrote:
> Thomas
> I use Tight VNC at home between my computer in the house and the 
> sensor computer in the garage(same network). I tried to use the same 
> server address from the garage from my work computer and could not 
> connect. How did you determine the server address for your sensor when 
> you are at a different location? Could my problem be a firewall issue?
> Regards
> Barry
>
I sent your question to Kevin my son who has the expertise in this area. 
He went to Purdue. The rest of my sons didn't. Here is his reply:

Firewalling is an issue.  Our network uses UltraVNC through an OpenVPN 
connection, where a client program for accessing 
http://freedns.afraid.org/ (an open DNS registration).  The client 
program is called "FreeDNS update".  This DNS approach has become 
unreliable in recent months, as Internet service providers become more 
aggressive in restricting the residential customers setting up rogue 
websites without paying for a business account.

The good news is that the dynamic IP address of your home connection 
doesn't change very often at all.  I had the same dynamic IP address on 
the Internet for about a year.  I am implementing other DNS solutions to 
find our way back to the "home network" that will involve interacting 
with another friendly network, that I also run.  It isn't an easy 
solution, but it will work for us.

If this is too technical, I can send him more questions or connect you 
with him off of PSN. He works cheap. All I have to do is babysit. And 
that's not bad. By the way, I don't use wiFi from the earthquake 
computer to my main home computers. I put in cable. That was before Wifi 
was ever an option!
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Counts
From: "tchannel"  tchannel@............ 
Date: Wed, 29 Apr 2009 09:02:00 -0600

Hi Folks,  I have two vertical sensors in test, both using Larry's one =
channel board and DATAQ adc.   One of the boards is set for low gain and =
one is set for high gain, using the jumper.

The first earthquake records was the 5.6m in Mexico April 27th.   Not =
unexpected the counts on the one using high gain was 10x the one using =
low gain.   Something like 70 vs 700.

Both traces looked fine and I could see little different, aside for the =
counts.   My question is what should my count target be?   Someone may =
have indicated about 100 to 300 counts during the quiet of night?

The reason I ask is I see data files posted with many using higher =
counts 700 or 800, instead of smaller numbers.    I know the higher gain =
feature on the board is for lower voltage output.   My coil and magnets =
are similar to Chris's quad magnet arrangement, and a coil of 4000 =
turns, so I have plenty of voltage.

I would like your opinions and why.


Thanks, Ted
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>Hi Folks,&nbsp; I have two vertical =
sensors in=20
test, both using Larry's one channel board and DATAQ adc.&nbsp;&nbsp; =
One of the=20
boards is set for low gain and one is set for high gain, using the=20
jumper.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>The first earthquake records was the =
5.6m in Mexico=20
April 27th.&nbsp;&nbsp; Not unexpected the counts on the one using high =
gain was=20
10x the one using low gain.&nbsp;&nbsp; Something like 70 vs =
700.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Both traces looked fine and I could see =
little=20
different, aside for the counts.&nbsp;&nbsp; My question is what should =
my count=20
target be?&nbsp;&nbsp; Someone may have indicated about 100 to =
300&nbsp;counts=20
during the quiet of night?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>The reason I ask is I see data files =
posted with=20
many using higher counts 700 or 800, instead of smaller=20
numbers.&nbsp;&nbsp;&nbsp; I know the higher gain feature on the board =
is for=20
lower voltage output.&nbsp;&nbsp; My coil and magnets are similar to =
Chris's=20
quad magnet arrangement, and a coil of 4000 turns, so I have plenty of=20
voltage.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>I would like your opinions and =
why.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Thanks, Ted</FONT></DIV></BODY></HTML>

Subject: Re: Counts
From: Robert McClure  bobmcclure90@......... 
Date: Wed, 29 Apr 2009 13:02:29 -0400

Hi Ted,

  I use the 12-bit Dataq DI-154 for data acquisition. I aim for about
100 microns per second for full scale output. To find out what is the
corresponding gain value to use to obtain this requires calibration of
your sensors. Please see my web page
http://bobmcclure90.googlepages.com/calibration for my calibration
procedures.

  Also, for short-period amateur vertical sensors, inverse filtering
is very advantageous for obtaining longer period response. See my web
pages for discussion of inverse filtering and download of  the
WQFilter utility program for inverse filtering of WinQuake files.

Bob

On 4/29/09, tchannel <tchannel@............> wrote:
> Hi Folks,  I have two vertical sensors in test, both using Larry's one
> channel board and DATAQ adc.   One of the boards is set for low gain and one
> is set for high gain, using the jumper.
>
> The first earthquake records was the 5.6m in Mexico April 27th.   Not
> unexpected the counts on the one using high gain was 10x the one using low
> gain.   Something like 70 vs 700.
>
> Both traces looked fine and I could see little different, aside for the
> counts.   My question is what should my count target be?   Someone may have
> indicated about 100 to 300 counts during the quiet of night?
>
> The reason I ask is I see data files posted with many using higher counts
> 700 or 800, instead of smaller numbers.    I know the higher gain feature on
> the board is for lower voltage output.   My coil and magnets are similar to
> Chris's quad magnet arrangement, and a coil of 4000 turns, so I have plenty
> of voltage.
>
> I would like your opinions and why.
>
>
> Thanks, Ted
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Counts
From: Barry Lotz  barry_lotz@............. 
Date: Wed, 29 Apr 2009 19:20:21 -0700 (PDT)

Ted
2 cents:
The late Sean Thomas Morrissey emailed PSN on Nov 13, 1999 with expected se=
ismograph output. He related amplitude,magnitude and distance.Using his dat=
a I plotted distance on the x axis, my vertical sensor count on the y axis =
and had lines for 0.5 magnitude incriments from 3 to 8. It was plotted on a=
 log-log scale.My particular sensor was theoretically 2000v/m/s @ 5 vts=3D3=
2768 cnt. I then plotted individual points for each actual event I recorded=
.. It correlated pretty well. The four corners of my graph were: Clip @ M4.5=
@100km, and M8 @ 14000km. My winter microseism amplitude was about 300 coun=
t. This related to M2.5 @ 100km and M6 @ 14000km. I like the idea of record=
ing at two or more gains simultaneously and after reviewing the data, savin=
g the best.=20

Barry
--- On Wed, 4/29/09, tchannel <tchannel@............> wrote:
From: tchannel <tchannel@............>
Subject: Counts
To: "psn" <psn-l@..............>
Date: Wednesday, April 29, 2009, 8:02 AM



=20
=20

Hi Folks,=A0 I have two vertical sensors in=20
test, both using Larry's one channel board and DATAQ adc.=A0=A0 One of the=
=20
boards is set for low gain and one is set for high gain, using the=20
jumper.
=A0
The first earthquake records was the 5.6m in Mexico=20
April 27th.=A0=A0 Not unexpected the counts on the one using high gain was=
=20
10x the one using low gain.=A0=A0 Something like 70 vs 700.
=A0
Both traces looked fine and I could see little=20
different, aside for the counts.=A0=A0 My question is what should my count=
=20
target be?=A0=A0 Someone may have indicated about 100 to 300=A0counts=20
during the quiet of night?
=A0
The reason I ask is I see data files posted with=20
many using higher counts 700 or 800, instead of smaller=20
numbers.=A0=A0=A0 I know the higher gain feature on the board is for=20
lower voltage output.=A0=A0 My coil and magnets are similar to Chris's=20
quad magnet arrangement, and a coil of 4000 turns, so I have plenty of=20
voltage.
=A0
I would like your opinions and why.
=A0
=A0
Thanks, Ted
<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;">Ted<br>2 cents:<br>The late Sean Thomas Morri=
ssey emailed PSN on Nov 13, 1999 with expected seismograph output. He relat=
ed amplitude,magnitude and distance.Using his data I plotted distance on th=
e x axis, my vertical sensor count on the y axis and had lines for 0.5 magn=
itude incriments from 3 to 8. It was plotted on a log-log scale.My particul=
ar sensor was theoretically 2000v/m/s @ 5 vts=3D32768 cnt. I then plotted i=
ndividual points for each actual event I recorded. It correlated pretty wel=
l. The four corners of my graph were: Clip @ M4.5@100km, and M8 @ 14000km. =
My winter microseism amplitude was about 300 count. This related to M2.5 @ =
100km and M6 @ 14000km. I like the idea of recording at two or more gains s=
imultaneously and after reviewing the data, saving the best. <br><br>Barry<=
br>--- On <b>Wed, 4/29/09, tchannel <i>&lt;tchannel@............&gt;</i></b=
>
 wrote:<br><blockquote style=3D"border-left: 2px solid rgb(16, 16, 255); ma=
rgin-left: 5px; padding-left: 5px;">From: tchannel &lt;tchannel@............
t&gt;<br>Subject: Counts<br>To: "psn" &lt;psn-l@..............&gt;<br>Date:=
 Wednesday, April 29, 2009, 8:02 AM<br><br><div id=3D"yiv79300638">

=20
=20
<style></style>
<div><font size=3D"2" face=3D"Arial">Hi Folks,&nbsp; I have two vertical se=
nsors in=20
test, both using Larry's one channel board and DATAQ adc.&nbsp;&nbsp; One o=
f the=20
boards is set for low gain and one is set for high gain, using the=20
jumper.</font></div>
<div><font size=3D"2" face=3D"Arial"></font>&nbsp;</div>
<div><font size=3D"2" face=3D"Arial">The first earthquake records was the 5=
..6m in Mexico=20
April 27th.&nbsp;&nbsp; Not unexpected the counts on the one using high gai=
n was=20
10x the one using low gain.&nbsp;&nbsp; Something like 70 vs 700.</font></d=
iv>
<div><font size=3D"2" face=3D"Arial"></font>&nbsp;</div>
<div><font size=3D"2" face=3D"Arial">Both traces looked fine and I could se=
e little=20
different, aside for the counts.&nbsp;&nbsp; My question is what should my =
count=20
target be?&nbsp;&nbsp; Someone may have indicated about 100 to 300&nbsp;cou=
nts=20
during the quiet of night?</font></div>
<div><font size=3D"2" face=3D"Arial"></font>&nbsp;</div>
<div><font size=3D"2" face=3D"Arial">The reason I ask is I see data files p=
osted with=20
many using higher counts 700 or 800, instead of smaller=20
numbers.&nbsp;&nbsp;&nbsp; I know the higher gain feature on the board is f=
or=20
lower voltage output.&nbsp;&nbsp; My coil and magnets are similar to Chris'=
s=20
quad magnet arrangement, and a coil of 4000 turns, so I have plenty of=20
voltage.</font></div>
<div><font size=3D"2" face=3D"Arial"></font>&nbsp;</div>
<div><font size=3D"2" face=3D"Arial">I would like your opinions and why.</f=
ont></div>
<div><font size=3D"2" face=3D"Arial"></font>&nbsp;</div>
<div><font size=3D"2" face=3D"Arial"></font>&nbsp;</div>
<div><font size=3D"2" face=3D"Arial">Thanks, Ted</font></div></div></blockq=
uote></td></tr></table>

Subject: Re: Counts
From: "Geoffrey"  gmvoeth@........... 
Date: Wed, 29 Apr 2009 19:36:36 -0700

Im not sure what you guys are talking about
BUT I thought all you need to do is
to increase the gain until you see
about +/- 2 counts of background noise.
Then you shall see about anything that sticks
its head above the grass.


----- Original Message ----- 
From: "Robert McClure" <bobmcclure90@.........>
To: <psn-l@..............>
Sent: Wednesday, April 29, 2009 10:02 AM
Subject: Re: Counts


> Hi Ted,
> 
>  I use the 12-bit Dataq DI-154 for data acquisition. I aim for about
> 100 microns per second for full scale output. To find out what is the
> corresponding gain value to use to obtain this requires calibration of
> your sensors. Please see my web page
> http://bobmcclure90.googlepages.com/calibration for my calibration
> procedures.
> 
>  Also, for short-period amateur vertical sensors, inverse filtering
> is very advantageous for obtaining longer period response. See my web
> pages for discussion of inverse filtering and download of  the
> WQFilter utility program for inverse filtering of WinQuake files.
> 
> Bob
> 
> On 4/29/09, tchannel <tchannel@............> wrote:
>> Hi Folks,  I have two vertical sensors in test, both using Larry's one
>> channel board and DATAQ adc.   One of the boards is set for low gain and one
>> is set for high gain, using the jumper.
>>
>> The first earthquake records was the 5.6m in Mexico April 27th.   Not
>> unexpected the counts on the one using high gain was 10x the one using low
>> gain.   Something like 70 vs 700.
>>
>> Both traces looked fine and I could see little different, aside for the
>> counts.   My question is what should my count target be?   Someone may have
>> indicated about 100 to 300 counts during the quiet of night?
>>
>> The reason I ask is I see data files posted with many using higher counts
>> 700 or 800, instead of smaller numbers.    I know the higher gain feature on
>> the board is for lower voltage output.   My coil and magnets are similar to
>> Chris's quad magnet arrangement, and a coil of 4000 turns, so I have plenty
>> of voltage.
>>
>> I would like your opinions and why.
>>
>>
>> Thanks, Ted
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Uploaded files
From: Thomas Dick  dickthomas01@............. 
Date: Thu, 30 Apr 2009 09:19:17 -0500

I'd like to open a new topic and maybe get some feedback as to what my 
files should contain for users of the PSN network. I know what I like to 
see in the presentation of my files but...
1. just how much data show be sent; I usually crop down to about two 
minutes before the arrival of P and then include at least some of the LR 
waves. Is this enough? I see some files are much longer than that...is 
there a reason.
2. some deep quakes don't show any LQ or LR .... what good is it to show 
this time frame?
3. should data containing erroneous spikes be uploading if the rest of 
the file is good .. I haven't been
4. my location is noisy; is there any value to the users of PSN  if 
files are filtered, like 2 pole, .5 low pass and .05 high pass for a 5.6 
mag quake 1600 miles away
5. do programs that in hence wave forms created by certain weaknesses in 
equipment (like short period verticals data being extended) serve a 
positive aid to users of this network
6. does the PSN group have any "Elmer's" that would have time to 
critique uploaded files and answer some questions
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: New Lehman seismometer
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Thu, 30 Apr 2009 19:59:23 +0000

Hi all

I got a new lehman seismomter build from the old one, that was not
working. The new one is bit more complex and more adjustable. Now I just
have to figure out how to get the seconds down to 10 to 20 seconds.

Here are pictures.

http://www.jonfr.com/myndir/v/geology/lehman/p4300001.jpg.html
http://www.jonfr.com/myndir/v/geology/lehman/p4300002.jpg.html

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: RE: Counts
From: "Gary Lindgren"  gel@................. 
Date: Thu, 30 Apr 2009 14:01:16 -0700

Ted,

Tell us about your new vertical design seismo. What is the resonant period,
any pictures?

Gary

 

 

 

 

 

From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of tchannel
Sent: Wednesday, April 29, 2009 8:02 AM
To: psn
Subject: Counts

 

Hi Folks,  I have two vertical sensors in test, both using Larry's one
channel board and DATAQ adc.   One of the boards is set for low gain and one
is set for high gain, using the jumper.

 

The first earthquake records was the 5.6m in Mexico April 27th.   Not
unexpected the counts on the one using high gain was 10x the one using low
gain.   Something like 70 vs 700.

 

Both traces looked fine and I could see little different, aside for the
counts.   My question is what should my count target be?   Someone may have
indicated about 100 to 300 counts during the quiet of night?

 

The reason I ask is I see data files posted with many using higher counts
700 or 800, instead of smaller numbers.    I know the higher gain feature on
the board is for lower voltage output.   My coil and magnets are similar to
Chris's quad magnet arrangement, and a coil of 4000 turns, so I have plenty
of voltage.

 

I would like your opinions and why.

 

 

Thanks, Ted

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<p class=3DMsoNormal><span =
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color:#1F497D'>Ted,<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Tell us about your new vertical design seismo. What is =
the resonant
period, any pictures?<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Gary<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div>

<div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in'>

<p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'> =
psn-l-request@..............
[mailto:psn-l-request@............... <b>On Behalf Of </b>tchannel<br>
<b>Sent:</b> Wednesday, April 29, 2009 8:02 AM<br>
<b>To:</b> psn<br>
<b>Subject:</b> Counts<o:p></o:p></span></p>

</div>

</div>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>Hi
Folks,&nbsp; I have two vertical sensors in test, both using Larry's one
channel board and DATAQ adc.&nbsp;&nbsp; One of the boards is set for =
low gain
and one is set for high gain, using the jumper.</span><o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal>&nbsp;<o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>The
first earthquake records was the 5.6m in Mexico April 27th.&nbsp;&nbsp; =
Not
unexpected the counts on the one using high gain was 10x the one using =
low
gain.&nbsp;&nbsp; Something like 70 vs 700.</span><o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal>&nbsp;<o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>Both
traces looked fine and I could see little different, aside for the
counts.&nbsp;&nbsp; My question is what should my count target =
be?&nbsp;&nbsp;
Someone may have indicated about 100 to 300&nbsp;counts during the quiet =
of
night?</span><o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal>&nbsp;<o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>The
reason I ask is I see data files posted with many using higher counts =
700 or
800, instead of smaller numbers.&nbsp;&nbsp;&nbsp; I know the higher =
gain
feature on the board is for lower voltage output.&nbsp;&nbsp; My coil =
and
magnets are similar to Chris's quad magnet arrangement, and a coil of =
4000
turns, so I have plenty of voltage.</span><o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal>&nbsp;<o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>I
would like your opinions and why.</span><o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal>&nbsp;<o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal>&nbsp;<o:p></o:p></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>Thanks,
Ted</span><o:p></o:p></p>

</div>

</div>

</body>

</html>

Subject: Re:Counts
From: rsparks  rsparks@.......... 
Date: Thu, 30 Apr 2009 16:07:57 -0700

Hi Geoffrey,

You raise an interesting question--What is the "grass"? =20

For some folks, it is the microseims apparently generated by ocean waves =
and maybe atmospherics.  For others, it is local man made noise.  For sti=
ll others, it may be the electronics of the amplifier, or noise from hing=
es or other seismometer  parts.

If your hinges and electronics are reasonably quiet, you should be able t=
o see much smaller vibrations "riding" on the traces from the microseims.=
  I like counts of 60 to 100 for the microseims so that I can see small l=
ocal quakes that are of higher frequency than the micoseims but much smal=
ler magnitude.  Counts like this also pick up local noise but a quake loo=
ks a lot different from a car going by.

BTW, I am using the Saum system that uses a  16 bit A/D and has a peak co=
unt of +/- 32768.

Roger

Geoffrey wrote:
Subject: Re: Counts
From:    "Geoffrey" <gmvoeth@...........>
Date:    Wed, 29 Apr 2009 19:36:36 -0700

Im not sure what you guys are talking about
BUT I thought all you need to do is
to increase the gain until you see
about =B1 2 counts of background noise.
Then you shall see about anything that sticks
its head above the grass.


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Re:Counts
From: "Edward Ianni"  edwianni1@........... 
Date: Thu, 30 Apr 2009 20:29:35 -0400

Thank you Rodger, but what does a count of 60 or a count of 100 mean =
specifically,........ a frequency or amplitude measurment or something =
else?   Thanks again, Ed.



.
----- Original Message -----=20
From: "rsparks" <rsparks@..........>
To: <psn-l@..............>
Sent: Thursday, April 30, 2009 7:07 PM
Subject: Re:Counts


Hi Geoffrey,

You raise an interesting question--What is the "grass"? =20

For some folks, it is the microseims apparently generated by ocean waves =
and maybe atmospherics.  For others, it is local man made noise.  For =
still others, it may be the electronics of the amplifier, or noise from =
hinges or other seismometer  parts.

If your hinges and electronics are reasonably quiet, you should be able =
to see much smaller vibrations "riding" on the traces from the =
microseims.  I like counts of 60 to 100 for the microseims so that I can =
see small local quakes that are of higher frequency than the micoseims =
but much smaller magnitude.  Counts like this also pick up local noise =
but a quake looks a lot different from a car going by.

BTW, I am using the Saum system that uses a  16 bit A/D and has a peak =
count of +/- 32768.

Roger

Geoffrey wrote:
Subject: Re: Counts
From:    "Geoffrey" <gmvoeth@...........>
Date:    Wed, 29 Apr 2009 19:36:36 -0700

Im not sure what you guys are talking about
BUT I thought all you need to do is
to increase the gain until you see
about =B1 2 counts of background noise.
Then you shall see about anything that sticks
its head above the grass.


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)



-------------------------------------------------------------------------=
-------



No virus found in this incoming message.
Checked by AVG - www.avg.com=20
Version: 8.5.285 / Virus Database: 270.12.11/2089 - Release Date: =
04/30/09 17:53:00
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
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<STYLE></STYLE>
</HEAD>
<BODY>
<DIV><FONT face=3DArial color=3D#ff0000 size=3D2><STRONG>Thank you =
Rodger, but what=20
does a count of 60 or a count of 100 mean specifically,........ a =
frequency or=20
amplitude measurment&nbsp;or something else?&nbsp;&nbsp; Thanks again,=20
Ed.</STRONG></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>----- Original Message ----- </FONT>
<DIV><FONT face=3DArial size=3D2>From: "rsparks" &lt;</FONT><A=20
href=3D"mailto:rsparks@.........."><FONT face=3DArial=20
size=3D2>rsparks@..........</FONT></A><FONT face=3DArial =
size=3D2>&gt;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>To: &lt;</FONT><A=20
href=3D"mailto:psn-l@.............."><FONT face=3DArial=20
size=3D2>psn-l@..............</FONT></A><FONT face=3DArial =
size=3D2>&gt;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Sent: Thursday, April 30, 2009 7:07 =
PM</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Subject: Re:Counts</FONT></DIV></DIV>
<DIV><FONT face=3DArial><BR><FONT size=3D2></FONT></FONT></DIV><FONT =
face=3DArial=20
size=3D2>Hi Geoffrey,<BR><BR>You raise an interesting question--What is =
the=20
"grass"?&nbsp; <BR><BR>For some folks, it is the microseims apparently =
generated=20
by ocean waves and maybe atmospherics.&nbsp; For others, it is local man =
made=20
noise.&nbsp; For still others, it may be the electronics of the =
amplifier, or=20
noise from hinges or other seismometer&nbsp; parts.<BR><BR>If your =
hinges and=20
electronics are reasonably quiet, you should be able to see much smaller =

vibrations "riding" on the traces from the microseims.&nbsp; I like =
counts of 60=20
to 100 for the microseims so that I can see small local quakes that are =
of=20
higher frequency than the micoseims but much smaller magnitude.&nbsp; =
Counts=20
like this also pick up local noise but a quake looks a lot different =
from a car=20
going by.<BR><BR>BTW, I am using the Saum system that uses a&nbsp; 16 =
bit A/D=20
and has a peak count of +/- 32768.<BR><BR>Roger<BR><BR>Geoffrey=20
wrote:<BR>Subject: Re: Counts<BR>From:&nbsp;&nbsp;&nbsp; "Geoffrey"=20
&lt;</FONT><A href=3D"mailto:gmvoeth@..........."><FONT face=3DArial=20
size=3D2>gmvoeth@...........</FONT></A><FONT face=3DArial=20
size=3D2>&gt;<BR>Date:&nbsp;&nbsp;&nbsp; Wed, 29 Apr 2009 19:36:36 =
-0700<BR><BR>Im=20
not sure what you guys are talking about<BR>BUT I thought all you need =
to do=20
is<BR>to increase the gain until you see<BR>about =B1 2 counts of =
background=20
noise.<BR>Then you shall see about anything that sticks<BR>its head =
above the=20
grass.<BR><BR><BR>_______________________________________________________=
___<BR><BR>Public=20
Seismic Network Mailing List (PSN-L)<BR><BR>To leave this list email =
</FONT><A=20
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<BR>the body of the message (first line only): unsubscribe<BR>See =
</FONT><A=20
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<P></P><FONT face=3DArial size=3D2>
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17:53:00<BR></FONT></BODY></HTML>

Subject: Re: Re:Counts
From: "Edward Ianni"  edwianni1@........... 
Date: Thu, 30 Apr 2009 20:37:25 -0400

Oops, sorry about that email gang, I was trying to reach Rodger.
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
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<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Oops, sorry about that email gang, I =
was trying to=20
reach Rodger.</FONT></DIV>
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BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"><FONT=20
  face=3DArial size=3D2>&nbsp;</BLOCKQUOTE></FONT></BODY></HTML>

Subject: Re: Counts
From: Mark Robinson  mark.robinson@............... 
Date: Fri, 01 May 2009 12:46:06 +1200

Edward Ianni wrote:
> *Thank you Rodger, but what does a count of 60 or a count of 100 mean 
> specifically,........ a frequency or amplitude measurment or something 
> else?   Thanks again, Ed.*

"counts" means the raw numbers output by the analogue to digital converter.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: New Lehman seismometer pivots
From: "Robert O. Green"  rog@.......... 
Date: Thu, 30 Apr 2009 19:46:15 -0700

Jon,

Very nice.

Can you describe the upper and lower pivots?

Is there advantage to having the coil on the boom rather than the magnet?

Rob

Jón Frímann wrote:
> Hi all
>
> I got a new lehman seismomter build from the old one, that was not
> working. The new one is bit more complex and more adjustable. Now I just
> have to figure out how to get the seconds down to 10 to 20 seconds.
>
> Here are pictures.
>
> http://www.jonfr.com/myndir/v/geology/lehman/p4300001.jpg.html
> http://www.jonfr.com/myndir/v/geology/lehman/p4300002.jpg.html
>
> Regards.
>   
> ------------------------------------------------------------------------
>
>
> Internal Virus Database is out of date.
> Checked by AVG - http://www.avg.com
> Version: 8.0.176 / Virus Database: 270.12.3/2075 - Release Date: 4/22/2009 5:25 PM
>
>   

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: New Lehman seismometer pivots
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Fri, 01 May 2009 13:58:47 +0000

Hi

Here are pictures of the top and lower pivots. The top is a hindge that
allows free movement of the arm.

It was recomenned to me that I should put the magnet on the base, not
the arm. But I am not sure about the diffrance, I don't think it is
none. But it works anyway.

I am still unable to get the sensor frequancy below 0.4Hz. But this
design is a lot more flexable then the last one I used.

After the weekend I am going to do one more change. I plan to change the
setting of the arm. So it has not such sharp angle, but I belive that is
hampering my effort in getting the frequancy below 0.4Hz, as sharp angle
means faster movement of the arm.

http://www.jonfr.com/myndir/v/geology/lehman/p5010001.jpg.html
http://www.jonfr.com/myndir/v/geology/lehman/p5010002.jpg.html
http://www.jonfr.com/myndir/v/geology/lehman/p5010003.jpg.html

Regards.
J=F3n Fr=EDmann.



On fim, 2009-04-30 at 19:46 -0700, Robert O. Green wrote:
> Jon,
>=20
> Very nice.
>=20
> Can you describe the upper and lower pivots?
>=20
> Is there advantage to having the coil on the boom rather than the magnet?
>=20
> Rob
>=20
> J=F3n Fr=EDmann wrote:
> > Hi all
> >
> > I got a new lehman seismomter build from the old one, that was not
> > working. The new one is bit more complex and more adjustable. Now I jus=
t
> > have to figure out how to get the seconds down to 10 to 20 seconds.
> >
> > Here are pictures.
> >
> > http://www.jonfr.com/myndir/v/geology/lehman/p4300001.jpg.html
> > http://www.jonfr.com/myndir/v/geology/lehman/p4300002.jpg.html
> >
> > Regards.
> >  =20
> > -----------------------------------------------------------------------=
-
> >
> >
> > Internal Virus Database is out of date.
> > Checked by AVG - http://www.avg.com
> > Version: 8.0.176 / Virus Database: 270.12.3/2075 - Release Date: 4/22/2=
009 5:25 PM
> >
> >  =20
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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Subject: Re: New Lehman seismometer
From: Robert McClure  bobmcclure90@......... 
Date: Fri, 1 May 2009 18:41:16 -0400

Hi Jon,

  I looked at your photos, and I think more work is needed.

  Be sure that none of the materials used in the boom and its parts
are magnetic.

  DO SOMETHING ABOUT THE WIRE LEAD TO THE COIL!!! You cannot just
leave it hanging loose from the boom. Cut it near the lower pivot,
secure it to the boom, and join it with coils of fine copper wire to
terminals on the frame. The terminals should be located as near to the
lower pivot as possible.

  TURN THE DAMPING VANE NINETY DEGREES. Then you can adjust the
damping by adjusting how far the vane protrudes into the magnet. As it
is arranged now, you can only adjust the damping by changing the field
gap of the magnet.

  Think about cross-bracing the uprights supporting the upper pivot in
order to reduce side sway, which could cause instability. An "A"
shaped upright frame would be the best for lateral stiffness.

  Be sure to mount the device on a base in solid contact with the
ground. Avoid any compliant material between the feet and ground. Long
period horizontal sensors are very tilt sensitive, so expect trace
excursions if you walk anywhere near it. Locate it inside and as far
away from human activity if you can.

  I do not like to see the coil and damping vane dangling down so far
below the pendulum.

  I cannot comment on your pivots, because there is not enough detail
shown. My personal belief is that the materials should be very hard,
polished, and preferably of dissimilar composition -- for example,
hardened steel mated with sapphire. Hard material resists flat spots,
and the use of different materials resists stiction from molecular
attraction at the interface.

  If you use balls and flat plates for pivots, the balls should be
attached to the frame, not the pendulum. This is to avoid shifting of
the hinge line if the point of contact of the ball with the plate
should slip.

  Similarly, if you use crossed rods for pivots, the axes of the rods
mounted on the frame should lie in a vertical plane.

Bob
PSN Station REM
http://bobmclure90.googlepages/home

~~~~~~~Original Message~~~~~~~~
Subject: New Lehman seismometer
From: jonfr@......
Date: Thu, 30 Apr 2009 19:59:23 +0000

Hi all

I got a new lehman seismometer built from the old one, that was not
working. The new one is bit more complex and more adjustable. Now I just
have to figure out how to get the seconds down to 10 to 20 seconds.

Here are pictures.

http://www.jonfr.com/myndir/v/geology/lehman/p4300001.jpg.html
http://www.jonfr.com/myndir/v/geology/lehman/p4300002.jpg.html

Regards.

Jon Frimann
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: New Lehman seismometer pivots
From: Dave Nelson  dave.nelson@............... 
Date: Sat, 02 May 2009 16:02:47 +1000

<html>
Jon,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; As I told you
several weeks ago and Bob McClure said within the last <br>
couple of days .....<br>
<b>&quot;DO SOMETHING ABOUT THE WIRE LEAD TO THE COIL!!! </b>You cannot
just <br>
leave it hanging loose from the boom. Cut it near the lower pivot, <br>
secure it to the boom, and join it with coils of fine copper wire to
<br>
terminals on the frame. The terminals should be located as near to the
<br>
lower pivot as possible.&quot;<br><br>
Jon.... You <b>MUST</b> do this you, will <b>NEVER</b> achieve long
period, free motion of the <br>
arm until you get this sorted out.&nbsp; It is absolutely essential to
get rid of that huge <br>
thick cable coming off the pivot end of the boom, it will be totally
destroying any <br>
attempt you make to try to get any decent sort of period from the
seismometer.<br>
Until you change that, almost anything else you do to the unit will be
worthless.<br>
see how it is done on this commercial long period seismo that I and
others are/have used .....&nbsp;
<a href=3D"http://www.sydneystormcity.com/990605-013a.jpg"=
 eudora=3D"autourl">www.sydneystormcity.com/990605-013a.jpg</a><br><br>
you can see that in this case there are 2 pair of cables coming along the
boom <br>
( there are 2 pickup coils on this seismo)&nbsp; they are terminated then
VERY fine wire connects them to terminals on the vertical part of the
frame.&nbsp; Use 26 - 30 swg enamelled wire ( the finer the
better).&nbsp; and also use finer cable between the pickup coil and the
terminal point&nbsp; that that thick cable you are currently
using.<br><br>
cheers<br>
Dave Nelson<br>
Sydney<br>
Australia<br><br>
<br><br>
At 01:58 PM 5/1/2009 +0000, you wrote:<br>
<blockquote type=3Dcite class=3Dcite cite>Hi<br>
I am still unable to get the sensor frequancy below 0.4Hz. But this<br>
design is a lot more flexable then the last one I used.<br><br>
After the weekend I am going to do one more change. I plan to change
the<br>
setting of the arm. So it has not such sharp angle, but I belive that
is<br>
hampering my effort in getting the frequancy below 0.4Hz, as sharp
angle<br>
means faster movement of the arm.<br>
<br>
Regards.<br>
J=F3n Fr=EDmann.</blockquote></html>


Subject: Re: New Lehman seismometer pivots
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sat, 02 May 2009 10:40:51 +0000

Hi

The wire is not the issue. As it currently is it not loose. But I did
place it nicely in regards to the boom and it's movement. The boom it
self is free to move without issue.

I am going to fix a lot of minor issues after the weekend, then I am
going to post more pictures. I have posted new pictures here, they are
hopefully more detailed then before.

http://www.jonfr.com/myndir/v/geology/lehman/p5020001.jpg.html

Regards.
J=F3n Fr=EDmann.


On lau, 2009-05-02 at 16:02 +1000, Dave Nelson wrote:
> Jon,
>           As I told you several weeks ago and Bob McClure said within
> the last=20
> couple of days .....
> "DO SOMETHING ABOUT THE WIRE LEAD TO THE COIL!!! You cannot just=20
> leave it hanging loose from the boom. Cut it near the lower pivot,=20
> secure it to the boom, and join it with coils of fine copper wire to=20
> terminals on the frame. The terminals should be located as near to
> the=20
> lower pivot as possible."
>=20
> Jon.... You MUST do this you, will NEVER achieve long period, free
> motion of the=20
> arm until you get this sorted out.  It is absolutely essential to get
> rid of that huge=20
> thick cable coming off the pivot end of the boom, it will be totally
> destroying any=20
> attempt you make to try to get any decent sort of period from the
> seismometer.
> Until you change that, almost anything else you do to the unit will be
> worthless.
> see how it is done on this commercial long period seismo that I and
> others are/have used .....  www.sydneystormcity.com/990605-013a.jpg
>=20
> you can see that in this case there are 2 pair of cables coming along
> the boom=20
> ( there are 2 pickup coils on this seismo)  they are terminated then
> VERY fine wire connects them to terminals on the vertical part of the
> frame.  Use 26 - 30 swg enamelled wire ( the finer the better).  and
> also use finer cable between the pickup coil and the terminal point
> that that thick cable you are currently using.
>=20
> cheers
> Dave Nelson
> Sydney
> Australia
>=20
>=20
>=20
> At 01:58 PM 5/1/2009 +0000, you wrote:
> > Hi
> > I am still unable to get the sensor frequancy below 0.4Hz. But this
> > design is a lot more flexable then the last one I used.
> >=20
> > After the weekend I am going to do one more change. I plan to change
> > the
> > setting of the arm. So it has not such sharp angle, but I belive
> > that is
> > hampering my effort in getting the frequancy below 0.4Hz, as sharp
> > angle
> > means faster movement of the arm.
> >=20
> > Regards.
> > J=F3n Fr=EDmann.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: New Lehman seismometer pivots
From: "Robert O. Green"  rog@.......... 
Date: Sat, 02 May 2009 06:17:07 -0700

Dave,

Is there are reason to have the coil on the boom?  Wouldn't these issues 
be eliminated if the coil was on the base plate and the magnet was on 
the boom?

Rob


Dave Nelson wrote:
> Jon,
>           As I told you several weeks ago and Bob McClure said within 
> the last
> couple of days .....
> *"DO SOMETHING ABOUT THE WIRE LEAD TO THE COIL!!! *You cannot just
> leave it hanging loose from the boom. Cut it near the lower pivot,
> secure it to the boom, and join it with coils of fine copper wire to
> terminals on the frame. The terminals should be located as near to the
> lower pivot as possible."
>
> Jon.... You *MUST* do this you, will *NEVER* achieve long period, free 
> motion of the
> arm until you get this sorted out.  It is absolutely essential to get 
> rid of that huge
> thick cable coming off the pivot end of the boom, it will be totally 
> destroying any
> attempt you make to try to get any decent sort of period from the 
> seismometer.
> Until you change that, almost anything else you do to the unit will be 
> worthless.
> see how it is done on this commercial long period seismo that I and 
> others are/have used ..... www.sydneystormcity.com/990605-013a.jpg 
> <http://www.sydneystormcity.com/990605-013a.jpg>
>
> you can see that in this case there are 2 pair of cables coming along 
> the boom
> ( there are 2 pickup coils on this seismo)  they are terminated then 
> VERY fine wire connects them to terminals on the vertical part of the 
> frame.  Use 26 - 30 swg enamelled wire ( the finer the better).  and 
> also use finer cable between the pickup coil and the terminal point  
> that that thick cable you are currently using.
>
> cheers
> Dave Nelson
> Sydney
> Australia
>
>
>
> At 01:58 PM 5/1/2009 +0000, you wrote:
>> Hi
>> I am still unable to get the sensor frequancy below 0.4Hz. But this
>> design is a lot more flexable then the last one I used.
>>
>> After the weekend I am going to do one more change. I plan to change the
>> setting of the arm. So it has not such sharp angle, but I belive that is
>> hampering my effort in getting the frequancy below 0.4Hz, as sharp angle
>> means faster movement of the arm.
>>
>> Regards.
>> Jón Frímann.
> ------------------------------------------------------------------------
>
>
> Internal Virus Database is out of date.
> Checked by AVG - http://www.avg.com
> Version: 8.0.176 / Virus Database: 270.12.3/2075 - Release Date: 4/22/2009 5:25 PM
>
>   

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Public Seismic Network Mailing List (PSN-L)


Subject: English Channel swarm
From: JAMES RIDOUT  jamesridout@.............. 
Date: Sat, 2 May 2009 13:23:21 +0000 (GMT)

Does anyone know if theres usually this many tremors in the English Channel=
.. Or is something going to happen?.
=A0
=A0http://www.southamptonweather.co.uk/wxquake.php
=A0
=A0=A0=A0=A0 James
<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;"><DIV>Does anyone know if theres usually this =
many tremors in the English Channel. Or is something going to happen?.</DIV=
>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;<A href=3D"http://www.southamptonweather.co.uk/wxquake.php">http=
://www.southamptonweather.co.uk/wxquake.php</A></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp; James</DIV></td></tr></table>

Subject: Re: New Lehman seismometer pivots 2
From: "Robert O. Green"  rog@.......... 
Date: Sat, 02 May 2009 06:24:36 -0700

Hi  Jon,

Thank you for these pictures they help.

Is the top pivot a set of crossed carbide steel shafts?

Is the bottom pivot a SS ball bearing on the boom against a SS bolt head?

I am about to begin my effort.  It seems the pivots are everything.

Rob

Jón Frímann wrote:
> Hi
>
> Here are pictures of the top and lower pivots. The top is a hindge that
> allows free movement of the arm.
>
> It was recomenned to me that I should put the magnet on the base, not
> the arm. But I am not sure about the diffrance, I don't think it is
> none. But it works anyway.
>
> I am still unable to get the sensor frequancy below 0.4Hz. But this
> design is a lot more flexable then the last one I used.
>
> After the weekend I am going to do one more change. I plan to change the
> setting of the arm. So it has not such sharp angle, but I belive that is
> hampering my effort in getting the frequancy below 0.4Hz, as sharp angle
> means faster movement of the arm.
>
> http://www.jonfr.com/myndir/v/geology/lehman/p5010001.jpg.html
> http://www.jonfr.com/myndir/v/geology/lehman/p5010002.jpg.html
> http://www.jonfr.com/myndir/v/geology/lehman/p5010003.jpg.html
>
> Regards.
> Jón Frímann.
>
>
>
> On fim, 2009-04-30 at 19:46 -0700, Robert O. Green wrote:
>   
>> Jon,
>>
>> Very nice.
>>
>> Can you describe the upper and lower pivots?
>>
>> Is there advantage to having the coil on the boom rather than the magnet?
>>
>> Rob
>>
>> Jón Frímann wrote:
>>     
>>> Hi all
>>>
>>> I got a new lehman seismomter build from the old one, that was not
>>> working. The new one is bit more complex and more adjustable. Now I just
>>> have to figure out how to get the seconds down to 10 to 20 seconds.
>>>
>>> Here are pictures.
>>>
>>> http://www.jonfr.com/myndir/v/geology/lehman/p4300001.jpg.html
>>> http://www.jonfr.com/myndir/v/geology/lehman/p4300002.jpg.html
>>>
>>> Regards.
>>>
>>> ------------------------------------------------------------------------
>>>
>>>
>>> Internal Virus Database is out of date.
>>> Checked by AVG - http://www.avg.com
>>> Version: 8.0.176 / Virus Database: 270.12.3/2075 - Release Date: 4/22/2009 5:25 PM
>>>
>>>
>>>       
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with
>> the body of the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>     
>> ------------------------------------------------------------------------
>>
>>
>> Internal Virus Database is out of date.
>> Checked by AVG - http://www.avg.com
>> Version: 8.0.176 / Virus Database: 270.12.3/2075 - Release Date: 4/22/2009 5:25 PM
>>
>>     

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Public Seismic Network Mailing List (PSN-L)


Subject: Re: English Channel swarm
From: "Geoffrey"  gmvoeth@........... 
Date: Sat, 2 May 2009 07:45:56 -0700

If you study the history of seismicity in Great Britan
you will see that it possible to have a big one
within that English Channel Area.
One such is believed to have happened
quite sometime ago that sent a tsunami on both sides
of the channel.


----- Original Message ----- 
From: "JAMES RIDOUT" <jamesridout@..............>
To: <psn-l@..............>
Sent: Saturday, May 02, 2009 6:23 AM
Subject: English Channel swarm


Does anyone know if theres usually this many tremors in the English Channel. Or is something going to happen?.

http://www.southamptonweather.co.uk/wxquake.php

James
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: English Channel swarm
From: Tangazazen@.......
Date: Sat, 2 May 2009 11:07:29 EDT

Hi James,
 
   I don't know about a tsunami but I am situated close to the  English 
Channel at Ashford and I did note that the quake two years ago ( M  4.7 ) did 
send ripples through my cup of tea!
 
Martin 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6001.18226" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>Hi James,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp; I don't know about a tsunami but I am situated close to=
 the 
English Channel&nbsp;at Ashford and I did note that the quake two years ag=
o ( M 
4.7 ) did send ripples through my cup of tea!</DIV>
<DIV>&nbsp;</DIV>
<DIV>Martin&nbsp;</DIV></FONT></BODY></HTML>

Subject: Re: English Channel swarm
From: "Geoffrey"  gmvoeth@........... 
Date: Sat, 2 May 2009 08:42:40 -0700

If you study the history you will see
a possibility of like a 7.0 happening
under the channel.

----- Original Message ----- 
From: <Tangazazen@.......>
To: <psn-l@..............>
Sent: Saturday, May 02, 2009 8:07 AM
Subject: Re: English Channel swarm


> Hi James,
> 
>   I don't know about a tsunami but I am situated close to the  English 
> Channel at Ashford and I did note that the quake two years ago ( M  4.7 ) did 
> send ripples through my cup of tea!
> 
> Martin 
>
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Public Seismic Network Mailing List (PSN-L)


Subject: Re: English Channel swarm
From: "Marchal van Lare"  vanlare@............. 
Date: Sat, 2 May 2009 17:55:13 +0200

Hi all,

I think those events are related to controlled mine detonations conducted by 
marine vessels; take a look at the time of events; most of them are during 
the daytime hours!

Regards,

Marchal van Lare
-Oostburg, The Netherlands


----- Original Message ----- 
From: "Geoffrey" <gmvoeth@...........>
To: <psn-l@..............>
Sent: Saturday, May 02, 2009 5:42 PM
Subject: Re: English Channel swarm


> If you study the history you will see
> a possibility of like a 7.0 happening
> under the channel.
>
> ----- Original Message ----- 
> From: <Tangazazen@.......>
> To: <psn-l@..............>
> Sent: Saturday, May 02, 2009 8:07 AM
> Subject: Re: English Channel swarm
>
>
>> Hi James,
>>
>>   I don't know about a tsunami but I am situated close to the  English 
>> Channel at Ashford and I did note that the quake two years ago ( M  4.7 ) 
>> did send ripples through my cup of tea!
>>
>> Martin
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with the body of the 
> message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information. 

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Subject: Re: English Channel swarm
From: Tangazazen@.......
Date: Sat, 2 May 2009 12:01:31 EDT



As the present swarm appears to be on the French side of the  channel I 
won't worry about it.
I believe the seismic activity is the results of an old wound from the  
closure of the Rheic sea that separated Avalonia from Gondwana some time  ago. 
I expect there have been many large earthquakes over the last few  hundred 
million years,
 
Martin
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6001.18226" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2><FONT id=3Drole_document face=3DAria=
l color=3D#000000 
size=3D2>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>As&nbsp;the present swarm appears to be on the French&nbsp;side of th=
e 
channel I won't worry about it.</DIV>
<DIV>I believe the seismic activity is the results of an&nbsp;old wound fr=
om the 
closure of the Rheic sea that separated Avalonia from Gondwana some time=
 
ago.&nbsp;I expect there have been many large earthquakes over the last fe=
w 
hundred million years,</DIV>
<DIV>&nbsp;</DIV>
<DIV>Martin</DIV></FONT></FONT></BODY></HTML>

Subject: Re: English Channel swarm
From: Tangazazen@.......
Date: Sat, 2 May 2009 12:10:46 EDT

Hi Marchal'
 
  It's a nice idea but if the reports are to be believed, then that's  a 
pretty deep hole that's been dug!
 
Martin  
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6001.18226" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>Hi Marchal'</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp; It's a nice idea but if the reports are to be believed, then=
 that's 
a pretty deep hole that's been dug!</DIV>
<DIV>&nbsp;</DIV>
<DIV>Martin&nbsp;&nbsp;</DIV></FONT></BODY></HTML>

Subject: Re: Uploaded files
From: rsparks  rsparks@.......... 
Date: Sat, 02 May 2009 09:23:21 -0700


Hello Thomas,

I thought I would give some feedback to your question about uploaded
files.  No doubt each of us
has a different goal when we look at traces generated by others, but my
questions are usually "Did they
capture a quake?" and "What did the wave look like there?".

The two questions may call for two different traces.  Filtering
frequently helps display the quake better,
eliminating some background noise.  On the other hand, filtering always
reconfigures the raw data so
that the original wave is no longer visible.

I will continue my comments as interjections into your text:

psn-l-digest-request@.............. wrote:
> .------ ------ ------ ------ ------ ------ ------ ------ ------ ------.
> | Message 1                                                           |
> '------ ------ ------ ------ ------ ------ ------ ------ ------ ------'
> Subject: Uploaded files
> From:    Thomas Dick <dickthomas01@.............>
> Date:    Thu, 30 Apr 2009 09:19:17 -0500
>
> I'd like to open a new topic and maybe get some feedback as to what my 
> files should contain for users of the PSN network. I know what I like to 
> see in the presentation of my files but...
> 1. just how much data show be sent; I usually crop down to about two 
> minutes before the arrival of P and then include at least some of the LR 
> waves. Is this enough? I see some files are much longer than that...is 
> there a reason.
>   
A M9 quake will shake the world for hours.  One M9 was recorded on my
instrument for over 4
hours.  I guess how much file you include depends upon what you are
trying to show your viewers.
> 2. some deep quakes don't show any LQ or LR .... what good is it to show 
> this time frame?
>   
I make the assumption that no trace means no data recorded.  Why use the
bandwidth?
> 3. should data containing erroneous spikes be uploading if the rest of 
> the file is good .. I haven't been
>   
Contaminated data SHOULD be discarded.   The viewer should be able to
expect the data to be
free of extraneous events to the best knowledge and ability of the
posting station.
> 4. my location is noisy; is there any value to the users of PSN  if 
> files are filtered, like 2 pole, .5 low pass and .05 high pass for a 5.6 
> mag quake 1600 miles away
>   
I prefer no filter, just the raw data.  Then I can filter the event if I
so choose.  If the event is posted
with the "volume" format available in WinQuake, then both filtered and
unfiltered traces can be
posted/viewed on the same screen.
> 5. do programs that in hence wave forms created by certain weaknesses in 
> equipment (like short period verticals data being extended) serve a 
> positive aid to users of this network
>   
I think the availability of such an enhancing program is very valuable
to demonstrate what a more
capable instrument might display.  I prefer not using such a filter
every posting because filters hide
the raw data.
> 6. does the PSN group have any "Elmer's" that would have time to 
> critique uploaded files and answer some questions
>
>
>   
I guess we are all "Elmers" in the sense that all of us are learning as
we go along, and can share what
we have learned.  Chris, Bob, and Larry are particularly skilled and
have generously shared in the past.
Thanks to them and many others who have contributed to this hobby.

Roger

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Subject: Re: New Lehman seismometer pivots 2
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sat, 02 May 2009 17:33:39 +0000

Hi

The material that I used in v2.0.0 sensor is mostly iron and steel.
Including the nesscary ball bearing and the boom. However, my sensors
does have issues. I hope to fix them after the weekend. When that change
is over, I am going add more pictures.

I plan to use this setup for the arm, as the setup needs to be forced
balance, as it currently use it holds the arm up by tugh hindge and that
does not work properly.

 http://www.mckimzey.com/seismometer/lehman/boom_support.jpg
http://www.mckimzey.com/lehman.html

Regards.
J=F3n Fr=EDmann.

On lau, 2009-05-02 at 06:24 -0700, Robert O. Green wrote:
> Hi  Jon,
>=20
> Thank you for these pictures they help.
>=20
> Is the top pivot a set of crossed carbide steel shafts?
>=20
> Is the bottom pivot a SS ball bearing on the boom against a SS bolt head?
>=20
> I am about to begin my effort.  It seems the pivots are everything.
>=20
> Rob
>=20
> J=F3n Fr=EDmann wrote:
> > Hi
> >
> > Here are pictures of the top and lower pivots. The top is a hindge that
> > allows free movement of the arm.
> >
> > It was recomenned to me that I should put the magnet on the base, not
> > the arm. But I am not sure about the diffrance, I don't think it is
> > none. But it works anyway.
> >
> > I am still unable to get the sensor frequancy below 0.4Hz. But this
> > design is a lot more flexable then the last one I used.
> >
> > After the weekend I am going to do one more change. I plan to change th=
e
> > setting of the arm. So it has not such sharp angle, but I belive that i=
s
> > hampering my effort in getting the frequancy below 0.4Hz, as sharp angl=
e
> > means faster movement of the arm.
> >
> > http://www.jonfr.com/myndir/v/geology/lehman/p5010001.jpg.html
> > http://www.jonfr.com/myndir/v/geology/lehman/p5010002.jpg.html
> > http://www.jonfr.com/myndir/v/geology/lehman/p5010003.jpg.html
> >
> > Regards.
> > J=F3n Fr=EDmann.
> >
> >
> >
> > On fim, 2009-04-30 at 19:46 -0700, Robert O. Green wrote:
> >  =20
> >> Jon,
> >>
> >> Very nice.
> >>
> >> Can you describe the upper and lower pivots?
> >>
> >> Is there advantage to having the coil on the boom rather than the magn=
et?
> >>
> >> Rob
> >>
> >> J=F3n Fr=EDmann wrote:
> >>    =20
> >>> Hi all
> >>>
> >>> I got a new lehman seismomter build from the old one, that was not
> >>> working. The new one is bit more complex and more adjustable. Now I j=
ust
> >>> have to figure out how to get the seconds down to 10 to 20 seconds.
> >>>
> >>> Here are pictures.
> >>>
> >>> http://www.jonfr.com/myndir/v/geology/lehman/p4300001.jpg.html
> >>> http://www.jonfr.com/myndir/v/geology/lehman/p4300002.jpg.html
> >>>
> >>> Regards.
> >>>
> >>> ---------------------------------------------------------------------=
---
> >>>
> >>>
> >>> Internal Virus Database is out of date.
> >>> Checked by AVG - http://www.avg.com
> >>> Version: 8.0.176 / Virus Database: 270.12.3/2075 - Release Date: 4/22=
/2009 5:25 PM
> >>>
> >>>
> >>>      =20
> >> __________________________________________________________
> >>
> >> Public Seismic Network Mailing List (PSN-L)
> >>
> >> To leave this list email PSN-L-REQUEST@.............. with
> >> the body of the message (first line only): unsubscribe
> >> See http://www.seismicnet.com/maillist.html for more information.
> >>    =20
> >> ----------------------------------------------------------------------=
--
> >>
> >>
> >> Internal Virus Database is out of date.
> >> Checked by AVG - http://www.avg.com
> >> Version: 8.0.176 / Virus Database: 270.12.3/2075 - Release Date: 4/22/=
2009 5:25 PM
> >>
> >>    =20
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.

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Subject: Re: English Channel swarm
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sat, 02 May 2009 17:38:36 +0000

Hi

There are really old fault zones in that area. This are was once a
subduction zone and contients did crash there, building mountins.

I do belive that this high number of earthquakes is quite unusual for
UK. But I am far from sure.

UK is considered to be really quiet part of the earth crust. Most of the
time. It is too bad that I don't know more about UK earthquakes. As I
have enough with my those in Iceland.

Regards.
J=F3n Fr=EDmann.

On lau, 2009-05-02 at 13:23 +0000, JAMES RIDOUT wrote:
> Does anyone know if theres usually this many tremors in the English
> Channel. Or is something going to happen?.
> =20
>  http://www.southamptonweather.co.uk/wxquake.php
> =20
>      James
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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Subject: Re: English Channel swarm
From: Tangazazen@.......
Date: Sat, 2 May 2009 14:37:46 EDT

Hi Marchal,
 
     If it was not for the depth you might have been  right. There exists 
an under water valley called the Hurd Deep just north of the  Channel 
Islands. It is about 150Km long, 1.5 to 5 Km wide and about 55-90  meteres deep and 
was used to dump explosives after the last war. If the  seismic activity 
had been that, it would have been more interesting.
 
Martin   
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6001.18226" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>Hi Marchal,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp; If it was not for the depth you might have=
 been 
right. There exists an under water valley called the Hurd Deep just north=
 of the 
Channel Islands. It is about 150Km long, 1.5 to 5 Km wide and about 55-90=
 
meteres&nbsp;deep and was used to dump explosives after the last war. If=
 the 
seismic activity had&nbsp;been that, it would have been more interesting.<=
/DIV>
<DIV>&nbsp;</DIV>
<DIV>Martin&nbsp;&nbsp;&nbsp;</DIV></FONT></BODY></HTML>

Subject: Re: English Channel swarm
From: "Marchal van Lare"  vanlare@............. 
Date: Sat, 2 May 2009 21:53:04 +0200

Hi Martin,

I am still pretty convinced those events are in fact mine detonations. =
The waveforms of those events show a typical explosion signature. There =
have been lots of mine sweeping acitvities further north along the =
Belgian coast also during the last few weeks.

Somewhat surprised to see the depth mentioned by the BGS. On the other =
hand, I have seen it before and they changed their information later on. =


I know the Dutch KNMI sometimes has to wait up to 2-3 weeks before they =
receive a confirmation of mine sweeping activities. In the mean time, =
the registered event is considered natural.

You can see such a detonation on youtube: =
http://www.youtube.com/watch?v=3Djo5aLDsfoaw


Regards,

Marchal


  ----- Original Message -----=20
  From: Tangazazen@..........
  To: psn-l@.................
  Sent: Saturday, May 02, 2009 8:37 PM
  Subject: Re: English Channel swarm


  Hi Marchal,

       If it was not for the depth you might have been right. There =
exists an under water valley called the Hurd Deep just north of the =
Channel Islands. It is about 150Km long, 1.5 to 5 Km wide and about =
55-90 meteres deep and was used to dump explosives after the last war. =
If the seismic activity had been that, it would have been more =
interesting.

  Martin   
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; =
FONT-FAMILY: Arial"=20
bottomMargin=3D7 bgColor=3D#ffffff leftMargin=3D7 topMargin=3D7 =
rightMargin=3D7>
<DIV>Hi Martin,</DIV>
<DIV>&nbsp;</DIV>
<DIV>I am still pretty convinced those events are in fact mine =
detonations. The=20
waveforms of those events show a typical explosion signature. There have =
been=20
lots of mine sweeping acitvities further north along the Belgian coast =
also=20
during the last few weeks.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Somewhat surprised to see the depth mentioned by the BGS. On the =
other=20
hand, I have seen it before and they changed their information later on. =
</DIV>
<DIV>&nbsp;</DIV>
<DIV>I know the Dutch KNMI sometimes has to wait up to 2-3 weeks before =
they=20
receive a confirmation of mine sweeping activities. In the mean time, =
the=20
registered event is considered natural.</DIV>
<DIV>&nbsp;</DIV>
<DIV>You can see such a detonation on youtube: <A=20
href=3D"http://www.youtube.com/watch?v=3Djo5aLDsfoaw">http://www.youtube.=
com/watch?v=3Djo5aLDsfoaw</A></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>Marchal</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3DTangazazen@..........
  href=3D"mailto:Tangazazen@.......">Tangazazen@.......</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, May 02, 2009 =
8:37=20
PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: English Channel =
swarm</DIV>
  <DIV><BR></DIV><FONT id=3Drole_document face=3DArial color=3D#000000 =
size=3D2>
  <DIV>Hi Marchal,</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp; If it was not for the depth you might =
have been=20
  right. There exists an under water valley called the Hurd Deep just =
north of=20
  the Channel Islands. It is about 150Km long, 1.5 to 5 Km wide and =
about 55-90=20
  meteres&nbsp;deep and was used to dump explosives after the last war. =
If the=20
  seismic activity had&nbsp;been that, it would have been more=20
interesting.</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Martin&nbsp;&nbsp;&nbsp;</DIV></BLOCKQUOTE></FONT></BODY></HTML>

Subject: Re: English Channel swarm
From: "tchannel"  tchannel@............ 
Date: Sat, 2 May 2009 14:10:45 -0600

Hi Folks,  Does anyone have any of these events as data files, .psn or .sac?
If so can you tell where we could download the data files?
Thanks, Ted Channel


----- Original Message ----- 
From: "Marchal van Lare" <vanlare@.............>
To: <psn-l@..............>
Sent: Saturday, May 02, 2009 9:55 AM
Subject: Re: English Channel swarm


> Hi all,
>
> I think those events are related to controlled mine detonations conducted 
> by marine vessels; take a look at the time of events; most of them are 
> during the daytime hours!
>
> Regards,
>
> Marchal van Lare
> -Oostburg, The Netherlands
>
>
> ----- Original Message ----- 
> From: "Geoffrey" <gmvoeth@...........>
> To: <psn-l@..............>
> Sent: Saturday, May 02, 2009 5:42 PM
> Subject: Re: English Channel swarm
>
>
>> If you study the history you will see
>> a possibility of like a 7.0 happening
>> under the channel.
>>
>> ----- Original Message ----- 
>> From: <Tangazazen@.......>
>> To: <psn-l@..............>
>> Sent: Saturday, May 02, 2009 8:07 AM
>> Subject: Re: English Channel swarm
>>
>>
>>> Hi James,
>>>
>>>   I don't know about a tsunami but I am situated close to the  English 
>>> Channel at Ashford and I did note that the quake two years ago ( M 
>>>  4.7 ) did send ripples through my cup of tea!
>>>
>>> Martin
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with the body of 
>> the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with the body of the 
> message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information. 

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: English Channel swarm
From: ChrisAtUpw@.......
Date: Sat, 2 May 2009 18:10:15 EDT

 
In a message dated 02/05/2009, tchannel@............ writes:

If so  can you tell where we could download the data files?
Thanks, Ted  Channel



Hi Ted,
 
    You can get broad band drumplots for the last 10  days at 
_http://www.earthquakes.bgs.ac.uk/helicorder/heli.html_ 
(http://www.earthquakes.bgs.ac.uk/helicorder/heli.html)  but  I don't see much which looks significant. The 
nearest station is JSA in the  Channel Islands. I  would expect local events 
to show up on the 3 to 8  second short period traces. Note that these are 
VERY small quakes! 
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 02/05/2009, tchannel@............ writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>If so 
  can you tell where we could download the data files?<BR>Thanks, Ted 
  Channel<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Ted,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You can get broad band drumplots for the last=
 10 
days at <A 
href=3D"http://www.earthquakes.bgs.ac.uk/helicorder/heli.html">http://www.=
earthquakes.bgs.ac.uk/helicorder/heli.html</A>&nbsp;but 
I don't see much which looks significant. The nearest station is JSA&nbsp;=
in the 
Channel Islands. I&nbsp; would expect local events to show up on the 3 to=
 8 
second short period traces. Note that these are VERY small quakes! </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Re: English Channel swarm
From: "tchannel"  tchannel@............ 
Date: Sat, 2 May 2009 16:38:35 -0600

Thank You Chris,

Ted
  ----- Original Message -----=20
  From: ChrisAtUpw@..........
  To: psn-l@.................
  Sent: Saturday, May 02, 2009 4:10 PM
  Subject: Re: English Channel swarm


  In a message dated 02/05/2009, tchannel@............ writes:
    If so can you tell where we could download the data files?
    Thanks, Ted Channel

  Hi Ted,

      You can get broad band drumplots for the last 10 days at =
http://www.earthquakes.bgs.ac.uk/helicorder/heli.html but I don't see =
much which looks significant. The nearest station is JSA in the Channel =
Islands. I  would expect local events to show up on the 3 to 8 second =
short period traces. Note that these are VERY small quakes!=20

      Regards,

      Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY style=3D"FONT-FAMILY: Arial; COLOR: #000000; FONT-SIZE: 10pt" =
id=3Drole_body=20
bottomMargin=3D7 leftMargin=3D7 rightMargin=3D7 topMargin=3D7 =
bgColor=3D#ffffff>
<DIV>Thank You Chris,</DIV>
<DIV>&nbsp;</DIV>
<DIV>Ted</DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
  <A title=3DChrisAtUpw@..........
  href=3D"mailto:ChrisAtUpw@.......">ChrisAtUpw@.......</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, May 02, 2009 =
4:10=20
PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: English Channel =
swarm</DIV>
  <DIV><BR></DIV><FONT id=3Drole_document color=3D#000000 size=3D2 =
face=3DArial>
  <DIV>
  <DIV>In a message dated 02/05/2009, <A=20
  href=3D"mailto:tchannel@............">tchannel@............</A> =
writes:</DIV>
  <BLOCKQUOTE=20
  style=3D"BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN-LEFT: =
5px"><FONT=20
    style=3D"BACKGROUND-COLOR: transparent" color=3D#000000 size=3D2 =
face=3DArial>If so=20
    can you tell where we could download the data files?<BR>Thanks, Ted=20
    Channel<BR></FONT></BLOCKQUOTE></DIV>
  <DIV></DIV>
  <DIV>Hi Ted,</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;You can get broad band drumplots for the =
last 10=20
  days at <A=20
  =
href=3D"http://www.earthquakes.bgs.ac.uk/helicorder/heli.html">http://www=
..earthquakes.bgs.ac.uk/helicorder/heli.html</A>&nbsp;but=20
  I don't see much which looks significant. The nearest station is =
JSA&nbsp;in=20
  the Channel Islands. I&nbsp; would expect local events to show up on =
the 3 to=20
  8 second short period traces. Note that these are VERY small quakes! =
</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris=20
Chapman</DIV></BLOCKQUOTE></FONT></BODY></HTML>

Subject: Guralp
From: "Jack Ivey"  ivey@.......... 
Date: Sat, 2 May 2009 22:23:46 -0400

Folks,

I've come into possession of a late 80's vintage Guralp vertical force
feedback seismo.

Unfortunately, it has no model information.  It has a 3"x9"
(waterproof-ish but not borehole-

ready) cylindrical sensor with very nice brass workings inside.  There
is also an amplifier

package in an aluminum cylinder.  It appears to use capacitive position
sensing, a force=20

feedback coil, and a triangular leaf spring to give about a 2-Hz
mechanical period.  It=20

has remote centering with a gearmotor, and a manual mass clamp for
shipping.  The

sensor has a cable coming out the bottom with a 10-pin MS connector on
the end, and

three pointed feet.  The sensor part looks pretty straightforward, and
I'm tracing the amp=20

circuit (this will take a while).

=20

This unit doesn't appear to be on Guralp's website. =20

=20

Anyone have any idea what I have here?  I can take some pictures if
it'll help.  Anyone

gotten obsolete information out of Guralp before?

=20

Thanks,

Jack

=20

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<div class=3DSection1>

<div>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Folks,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I've come into possession of a late =
80's
vintage Guralp vertical force feedback =
seismo.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Unfortunately, it has no model
information. &nbsp;It has a 3&quot;x9&quot; (waterproof-ish but not =
borehole-<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>ready) cylindrical sensor with very =
nice
brass workings inside.&nbsp; There is also an =
amplifier<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>package in an aluminum =
cylinder.&nbsp; It
appears to use capacitive position sensing, a force =
<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>feedback coil, and a triangular =
leaf
spring to give about a 2-Hz mechanical period. &nbsp;It =
<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>has remote centering with a =
gearmotor, and
a manual mass clamp for shipping. &nbsp;The<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>sensor has a cable coming out the =
bottom
with a 10-pin MS connector on the end, and<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>three pointed feet.&nbsp; The =
sensor part
looks pretty straightforward, and I'm tracing the amp =
<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>circuit (this will take a =
while).<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>This unit doesn't appear to be on =
Guralp's
website. &nbsp;<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Anyone have any idea what I have =
here?&nbsp;
I can take some pictures if it'll help.&nbsp; =
Anyone<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>gotten obsolete information out of =
Guralp
before?<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Thanks,<o:p></o:p></span></font></p>=


<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Jack<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

</div>

</div>

</body>

</html>

Subject: Re: Guralp seismo
From: Dave Nelson  dave.nelson@............... 
Date: Sun, 03 May 2009 13:26:19 +1000

<html>
Greetings Jack,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
When I visited the USGS.NEIC HQ in Golden, Colorado in 2006,<br>
&nbsp;John McMillan whas the lab tech that showed us lots of wonderful
gear<br>
amongst that were the Gulrap Horiz and Vert&nbsp; seismo's <br>
<a href="http://www.sydneystormcity.com/Guralp_CMG-V30_horiz_seismom1.JPG" eudora="autourl">www.sydneystormcity.com/Guralp_CMG-V30_horiz_seismom1.JPG</a><br><br>
<a href="http://www.sydneystormcity.com/Guralp_CMG-V30_vert_seismom1.JPG" eudora="autourl">www.sydneystormcity.com/Guralp_CMG-V30_vert_seismom1.JPG</a><br><br>
maybe the same as you have acquired&nbsp; :)&nbsp;&nbsp;&nbsp; I dont
know if John is still there<br>
but a phone call to there may get you some data sheets anyway<br><br>
see how you go<br>
Dave Nelson<br>
Sydney<br><br>
<br>
At 10:23 PM 5/2/2009 -0400, you wrote:<br>
<blockquote type=cite class=cite cite><font face="arial" size=2 color="#000080">Folks,<br>
I've come into possession of a late 80's vintage Guralp vertical force
feedback seismo.<br>
Unfortunately, it has no model information.&nbsp; It has a
3&quot;x9&quot; (waterproof-ish but not borehole-<br>
ready) cylindrical sensor with very nice brass workings inside.&nbsp;
There is also an amplifier<br>
package in an aluminum cylinder.&nbsp; It appears to use capacitive
position sensing, a force <br>
feedback coil, and a triangular leaf spring to give about a 2-Hz
mechanical period.&nbsp; It <br>
has remote centering with a gearmotor, and a manual mass clamp for
shipping.&nbsp; The<br>
sensor has a cable coming out the bottom with a 10-pin MS connector on
the end, and<br>
three pointed feet.&nbsp; The sensor part looks pretty straightforward,
and I'm tracing the amp <br>
circuit (this will take a while).<br>
This unit doesn't appear to be on Guralp's website.&nbsp; <br>
</font><br>
<font face="arial" size=2 color="#000080">Anyone have any idea what I
have here?&nbsp; I can take some pictures if it'll help.&nbsp;
Anyone<br>
gotten obsolete information out of Guralp before?<br>
Thanks,<br>
Jack</font></blockquote></html>


Subject: Re: English Channel swarm
From: Tangazazen@.......
Date: Sun, 3 May 2009 05:09:49 EDT

Hi Marchal,
 
    These earthquake are very small in magnitude, may  be the depth 
estimate is suspect.
I remember that it was difficult to determine the nature of the North  
Korean so called atomic bomb test.
There was also an article in the Scientific American a while ago about the  
detection of under ground nuclear explosions and apparently a false alarm 
was  created by a mine collapsing.
 
Unfortunately the urban noise at my site is too high to distinguish these  
latest English channel events. 
 
 
Regards Martin 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6001.18226" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2><FONT id=3Drole_document face=3DAria=
l color=3D#000000 
size=3D2>
<DIV>Hi Marchal,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;These earthquake are very small in magnitude,=
 may 
be the depth estimate is suspect.</DIV>
<DIV>I remember that it was difficult to determine the nature of the North=
 
Korean so called atomic bomb test.</DIV>
<DIV>There was also an article in the Scientific American a while ago abou=
t the 
detection of under ground nuclear explosions and apparently a false alarm=
 was 
created by a mine collapsing.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Unfortunately the urban noise at my site is too high to distinguish=
 these 
latest English channel events.&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>Regards Martin&nbsp;</DIV></FONT></FONT></BODY></HTML>

Subject: RE: Guralp seismo
From: "Jack Ivey"  ivey@.......... 
Date: Sun, 3 May 2009 09:19:32 -0400

Dave,

That looks very similar to what I have - probably a slightly newer or
older model.

Thanks for the tip!

=20

Jack

=20

________________________________

From: psn-l-request@.............. [mailto:psn-l-request@...............
On Behalf Of Dave Nelson
Sent: Saturday, May 02, 2009 11:26 PM
To: psn-l@..............
Subject: Re: Guralp seismo

=20

Greetings Jack,
             When I visited the USGS.NEIC HQ in Golden, Colorado in
2006,
 John McMillan whas the lab tech that showed us lots of wonderful gear
amongst that were the Gulrap Horiz and Vert  seismo's=20
www.sydneystormcity.com/Guralp_CMG-V30_horiz_seismom1.JPG

www.sydneystormcity.com/Guralp_CMG-V30_vert_seismom1.JPG

maybe the same as you have acquired  :)    I dont know if John is still
there
but a phone call to there may get you some data sheets anyway

see how you go
Dave Nelson
Sydney


At 10:23 PM 5/2/2009 -0400, you wrote:



Folks,
I've come into possession of a late 80's vintage Guralp vertical force
feedback seismo.
Unfortunately, it has no model information.  It has a 3"x9"
(waterproof-ish but not borehole-
ready) cylindrical sensor with very nice brass workings inside.  There
is also an amplifier
package in an aluminum cylinder.  It appears to use capacitive position
sensing, a force=20
feedback coil, and a triangular leaf spring to give about a 2-Hz
mechanical period.  It=20
has remote centering with a gearmotor, and a manual mass clamp for
shipping.  The
sensor has a cable coming out the bottom with a 10-pin MS connector on
the end, and
three pointed feet.  The sensor part looks pretty straightforward, and
I'm tracing the amp=20
circuit (this will take a while).
This unit doesn't appear to be on Guralp's website. =20

Anyone have any idea what I have here?  I can take some pictures if
it'll help.  Anyone
gotten obsolete information out of Guralp before?
Thanks,
Jack

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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Dave,<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>That looks very similar to what I =
have &#8211;
probably a slightly newer or older model.<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Thanks for the =
tip!<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Jack<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p>&nbsp;</o:p></span></font></p>

<div>

<div class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>

<hr size=3D2 width=3D"100%" align=3Dcenter tabindex=3D-1>

</span></font></div>

<p class=3DMsoNormal><b><font size=3D2 face=3DTahoma><span =
style=3D'font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font =
size=3D2
face=3DTahoma><span style=3D'font-size:10.0pt;font-family:Tahoma'>
psn-l-request@.............. [mailto:psn-l-request@............... =
<b><span
style=3D'font-weight:bold'>On Behalf Of </span></b>Dave Nelson<br>
<b><span style=3D'font-weight:bold'>Sent:</span></b> Saturday, May 02, =
2009 11:26
PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
psn-l@..............<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Re: Guralp =
seismo</span></font><o:p></o:p></p>

</div>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'><o:p>&nbsp;</o:p></span></font></p>

<p class=3DMsoNormal><font size=3D3 face=3D"Times New Roman"><span =
style=3D'font-size:
12.0pt'>Greetings Jack,<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
When I
visited the USGS.NEIC HQ in Golden, <st1:State w:st=3D"on"><st1:place =
w:st=3D"on">Colorado</st1:place></st1:State>
in 2006,<br>
&nbsp;John McMillan whas the lab tech that showed us lots of wonderful =
gear<br>
amongst that were the Gulrap Horiz and Vert&nbsp; seismo's <br>
<a =
href=3D"http://www.sydneystormcity.com/Guralp_CMG-V30_horiz_seismom1.JPG"=

eudora=3Dautourl>www.sydneystormcity.com/Guralp_CMG-V30_horiz_seismom1.JP=
G</a><br>
<br>
<a =
href=3D"http://www.sydneystormcity.com/Guralp_CMG-V30_vert_seismom1.JPG"
eudora=3Dautourl>www.sydneystormcity.com/Guralp_CMG-V30_vert_seismom1.JPG=
</a><br>
<br>
maybe the same as you have acquired&nbsp; :)&nbsp;&nbsp;&nbsp; I dont =
know if
John is still there<br>
but a phone call to there may get you some data sheets anyway<br>
<br>
see how you go<br>
Dave Nelson<br>
<st1:City w:st=3D"on"><st1:place =
w:st=3D"on">Sydney</st1:place></st1:City><br>
<br>
<br>
At 10:23 PM 5/2/2009 -0400, you wrote:<br>
<br>
<o:p></o:p></span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>Folks,<br>
I've come into possession of a late 80's vintage Guralp vertical force =
feedback
seismo.<br>
Unfortunately, it has no model information.&nbsp; It has a =
3&quot;x9&quot;
(waterproof-ish but not borehole-<br>
ready) cylindrical sensor with very nice brass workings inside.&nbsp; =
There is
also an amplifier<br>
package in an aluminum cylinder.&nbsp; It appears to use capacitive =
position
sensing, a force <br>
feedback coil, and a triangular leaf spring to give about a 2-Hz =
mechanical
period.&nbsp; It <br>
has remote centering with a gearmotor, and a manual mass clamp for
shipping.&nbsp; The<br>
sensor has a cable coming out the bottom with a 10-pin MS connector on =
the end,
and<br>
three pointed feet.&nbsp; The sensor part looks pretty straightforward, =
and I'm
tracing the amp <br>
circuit (this will take a while).<br>
This unit doesn't appear to be on Guralp's website.&nbsp; <br>
</span></font><br>
<font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:10.0pt;font-family:
Arial;color:navy'>Anyone have any idea what I have here?&nbsp; I can =
take some
pictures if it'll help.&nbsp; Anyone<br>
gotten obsolete information out of Guralp before?<br>
Thanks,<br>
Jack</span></font><o:p></o:p></p>

</div>

</body>

</html>

Subject: event
From: Thomas Dick  dickthomas01@............. 
Date: Sun, 03 May 2009 11:35:53 -0500

about 16:26 ...anybody got a location yet?
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: event
From: Canie  canie@........... 
Date: Sun, 03 May 2009 09:41:17 -0700

6.1 Guatemala?

http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/us2009geat.php

At 09:35 AM 5/3/2009, you wrote:
>about 16:26 ...anybody got a location yet?
>__________________________________________________________

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: event
From: Thomas Dick  dickthomas01@............. 
Date: Sun, 03 May 2009 11:47:20 -0500

Canie wrote:
> 6.1 Guatemala?
>
> http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/us2009geat.php
>
> At 09:35 AM 5/3/2009, you wrote:
>> about 16:26 ...anybody got a location yet?
>> __________________________________________________________
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with the body of 
> the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
Thanks -- 16:45 and still shaking here .. not really a rolling , more 
irregularity to it. ..jaged
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: event
From: "tchannel"  tchannel@............ 
Date: Sun, 3 May 2009 10:51:37 -0600

We got it loud and clear, here in Idaho
Ted


----- Original Message ----- 
From: "Thomas Dick" <dickthomas01@.............>
To: <psn-l@..............>
Sent: Sunday, May 03, 2009 10:47 AM
Subject: Re: event


> Canie wrote:
>> 6.1 Guatemala?
>>
>> http://earthquake.usgs.gov/eqcenter/recenteqsww/Quakes/us2009geat.php
>>
>> At 09:35 AM 5/3/2009, you wrote:
>>> about 16:26 ...anybody got a location yet?
>>> __________________________________________________________
>>
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with the body of 
>> the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>
> Thanks -- 16:45 and still shaking here .. not really a rolling , more 
> irregularity to it. ..jaged
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: 6.1M Guatemala
From: "tchannel"  tchannel@............ 
Date: Sun, 3 May 2009 11:01:31 -0600

Hello Rolando Benitez,  If you have time, would you tell the group about =
your experience.

Thanks, Ted
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial>Hello Rolando Benitez,&nbsp; If you have time, =
would you=20
tell the group about your experience.</FONT></DIV>
<DIV><FONT face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial>Thanks, Ted</FONT></DIV></BODY></HTML>

Subject: Re: English Channel swarm
From: "Marchal van Lare"  vanlare@............. 
Date: Mon, 4 May 2009 19:37:04 +0200

Hi,

I have some 'suspect' signals; but the noise level was a little to high, =
but you can see the events on =
http://www.earthquakes.bgs.ac.uk/helicorder/heli.html and check out the =
new station Elsham (short period channel).

Marchal
  ----- Original Message -----=20
  From: tchannel=20
  To: psn-l@.................
  Sent: Sunday, May 03, 2009 12:38 AM
  Subject: Re: English Channel swarm


  Thank You Chris,

  Ted
    ----- Original Message -----=20
    From: ChrisAtUpw@..........
    To: psn-l@.................
    Sent: Saturday, May 02, 2009 4:10 PM
    Subject: Re: English Channel swarm


    In a message dated 02/05/2009, tchannel@............ writes:
      If so can you tell where we could download the data files?
      Thanks, Ted Channel

    Hi Ted,

        You can get broad band drumplots for the last 10 days at =
http://www.earthquakes.bgs.ac.uk/helicorder/heli.html but I don't see =
much which looks significant. The nearest station is JSA in the Channel =
Islands. I  would expect local events to show up on the 3 to 8 second =
short period traces. Note that these are VERY small quakes!=20

        Regards,

        Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; =
FONT-FAMILY: Arial"=20
bottomMargin=3D7 bgColor=3D#ffffff leftMargin=3D7 topMargin=3D7 =
rightMargin=3D7>
<DIV>Hi,</DIV>
<DIV>&nbsp;</DIV>
<DIV>I have some 'suspect' signals; but the noise level was a little to =
high,=20
but you can see the events on <A=20
href=3D"http://www.earthquakes.bgs.ac.uk/helicorder/heli.html">http://www=
..earthquakes.bgs.ac.uk/helicorder/heli.html</A>&nbsp;and=20
check out the new station Elsham (short period channel).</DIV>
<DIV>&nbsp;</DIV>
<DIV>Marchal</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Dtchannel@...............
  href=3D"mailto:tchannel@............">tchannel</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, May 03, 2009 =
12:38 AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: English Channel =
swarm</DIV>
  <DIV><BR></DIV>
  <DIV>Thank You Chris,</DIV>
  <DIV>&nbsp;</DIV>
  <DIV>Ted</DIV>
  <BLOCKQUOTE dir=3Dltr=20
  style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
    <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
    <DIV=20
    style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
    <A title=3DChrisAtUpw@..........
    href=3D"mailto:ChrisAtUpw@.......">ChrisAtUpw@.......</A> </DIV>
    <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
    href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
    <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, May 02, 2009 =
4:10=20
    PM</DIV>
    <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: English Channel=20
swarm</DIV>
    <DIV><BR></DIV><FONT id=3Drole_document face=3DArial color=3D#000000 =
size=3D2>
    <DIV>
    <DIV>In a message dated 02/05/2009, <A=20
    href=3D"mailto:tchannel@............">tchannel@............</A> =
writes:</DIV>
    <BLOCKQUOTE=20
    style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px =
solid"><FONT=20
      style=3D"BACKGROUND-COLOR: transparent" face=3DArial =
color=3D#000000 size=3D2>If=20
      so can you tell where we could download the data files?<BR>Thanks, =
Ted=20
      Channel<BR></FONT></BLOCKQUOTE></DIV>
    <DIV></DIV>
    <DIV>Hi Ted,</DIV>
    <DIV>&nbsp;</DIV>
    <DIV>&nbsp;&nbsp;&nbsp;&nbsp;You can get broad band drumplots for =
the last=20
    10 days at <A=20
    =
href=3D"http://www.earthquakes.bgs.ac.uk/helicorder/heli.html">http://www=
..earthquakes.bgs.ac.uk/helicorder/heli.html</A>&nbsp;but=20
    I don't see much which looks significant. The nearest station is =
JSA&nbsp;in=20
    the Channel Islands. I&nbsp; would expect local events to show up on =
the 3=20
    to 8 second short period traces. Note that these are VERY small =
quakes!=20
    </DIV>
    <DIV>&nbsp;</DIV>
    <DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
    <DIV>&nbsp;</DIV>
    <DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris=20
Chapman</DIV></BLOCKQUOTE></BLOCKQUOTE></FONT></BODY></HTML>

Subject: Re: New Lehman seismometer pivots
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Mon, 04 May 2009 19:24:43 +0000

Hi all

The reason for having the coil on the boom is noise related. This
setting appearly elimiates the extra noise if the magnet is on the boom.

Here are new pictures of latest changes to my lehman seismomter.

http://www.jonfr.com/myndir/v/geology/lehman/p5040001.jpg.html
http://www.jonfr.com/myndir/v/geology/lehman/p5040003.jpg.html

Regards.
J=F3n Fr=EDmann.

On lau, 2009-05-02 at 06:17 -0700, Robert O. Green wrote:
> Dave,
>=20
> Is there are reason to have the coil on the boom?  Wouldn't these issues=20
> be eliminated if the coil was on the base plate and the magnet was on=20
> the boom?
>=20
> Rob
>=20
>=20
> Dave Nelson wrote:
> > Jon,
> >           As I told you several weeks ago and Bob McClure said within=20
> > the last
> > couple of days .....
> > *"DO SOMETHING ABOUT THE WIRE LEAD TO THE COIL!!! *You cannot just
> > leave it hanging loose from the boom. Cut it near the lower pivot,
> > secure it to the boom, and join it with coils of fine copper wire to
> > terminals on the frame. The terminals should be located as near to the
> > lower pivot as possible."
> >
> > Jon.... You *MUST* do this you, will *NEVER* achieve long period, free=20
> > motion of the
> > arm until you get this sorted out.  It is absolutely essential to get=20
> > rid of that huge
> > thick cable coming off the pivot end of the boom, it will be totally=20
> > destroying any
> > attempt you make to try to get any decent sort of period from the=20
> > seismometer.
> > Until you change that, almost anything else you do to the unit will be=20
> > worthless.
> > see how it is done on this commercial long period seismo that I and=20
> > others are/have used ..... www.sydneystormcity.com/990605-013a.jpg=20
> > <http://www.sydneystormcity.com/990605-013a.jpg>
> >
> > you can see that in this case there are 2 pair of cables coming along=20
> > the boom
> > ( there are 2 pickup coils on this seismo)  they are terminated then=20
> > VERY fine wire connects them to terminals on the vertical part of the=20
> > frame.  Use 26 - 30 swg enamelled wire ( the finer the better).  and=20
> > also use finer cable between the pickup coil and the terminal point =20
> > that that thick cable you are currently using.
> >
> > cheers
> > Dave Nelson
> > Sydney
> > Australia
> >
> >
> >
> > At 01:58 PM 5/1/2009 +0000, you wrote:
> >> Hi
> >> I am still unable to get the sensor frequancy below 0.4Hz. But this
> >> design is a lot more flexable then the last one I used.
> >>
> >> After the weekend I am going to do one more change. I plan to change t=
he
> >> setting of the arm. So it has not such sharp angle, but I belive that =
is
> >> hampering my effort in getting the frequancy below 0.4Hz, as sharp ang=
le
> >> means faster movement of the arm.
> >>
> >> Regards.
> >> J=F3n Fr=EDmann.
> > -----------------------------------------------------------------------=
-
> >
> >
> > Internal Virus Database is out of date.
> > Checked by AVG - http://www.avg.com
> > Version: 8.0.176 / Virus Database: 270.12.3/2075 - Release Date: 4/22/2=
009 5:25 PM
> >
> >  =20
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.

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Subject: Re: 6.1M Guatemala
From: rbenitez@........
Date: Mon, 4 May 2009 13:50:40 -0500 (CDT)

> Hello Rolando Benitez,  If you have time, would you tell the group about
> your experience.
>
> Thanks, Ted

Hello Ted,
Here is a fragment of an email I sent few hours after the quake. I am just
reading your msg today monday, after several days out of the country.

We have had several strong quakes in the recent weeks, sometimes a lesser
magnitude event is felt stronger when it is closer and shallower that the
one of sunday morning, I say this because 6 hours before the M6.1 we had a
M4 but at 12km deep and at about  6 miles away... it rattled everything
but for a shorter time. Here is the edited comment:

"The story begun last midnight. I just came home from a hospital check in
Florida at about 0300 UTC. At exactly 0600 UTC we had a very strong
movement but short in duration. I was not in the mood to check it in the
computer at that very time, but it called every one's attention. This
morning while I was checking the data logger pc and calculating the P and
S locations in the trace of the midnight event, all of the sudden I felt a
very strong vertical movement that lasted some seconds followed by an even
stronger rocking movement. At this time every piece of glass at home was
rattling, some books fell down from the shelves and the alarm in the cars
went off. This event felt like it lasted forever.

As I was in front of the datalogger, I were able to "watch" the event in
real time. It begun with no previous warning or precursors and had just
one small aftershock. The P and S arrivals were very clearly felt and
differentiated. Rayleigh and Love waves also were felt, they had a slower
rocking movement. The event was sensible for over 5 minutes, the sensors
kept on moving for over 20 minutes. The traces in the pc were totally
saturated, the sensors were literally moving from stop to stop for a
while. An interesting and scary experience to say the least.

So far there has been reports of some damages in the area near the
epicenter, some injured but no casualties so far.

An active volcano (Santiaguito), near the epicenter started to erupt
violently just at the time of the quake and it still is abnormally
exacerbating erupting. Others Like the Pacaya volcano and Fuego volcano
start erupting also but with lesser intensity. They all are in the
epicenter vicinity.

If we could predict the earthquakes, I am sure these could be a very
interesting ones to call for a seismologists meeting, I can bet nobody
would get boring."

Well hope this help to spoil your curiosity on learning more about living
in quake territory, or to mitigate your wanting to know.
Best regards,
Rolando

PS
My postings are in the PSN web page. We have had several dozens of
aftershocks since the major one...

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: 6.1M Guatemala
From: "tchannel"  tchannel@............ 
Date: Mon, 4 May 2009 14:04:26 -0600

Rolando, Thank you.
Ted


----- Original Message ----- 
From: <rbenitez@........>
To: <psn-l@..............>
Sent: Monday, May 04, 2009 12:50 PM
Subject: Re: 6.1M Guatemala


>> Hello Rolando Benitez,  If you have time, would you tell the group about
>> your experience.
>>
>> Thanks, Ted
>
> Hello Ted,
> Here is a fragment of an email I sent few hours after the quake. I am just
> reading your msg today monday, after several days out of the country.
>
> We have had several strong quakes in the recent weeks, sometimes a lesser
> magnitude event is felt stronger when it is closer and shallower that the
> one of sunday morning, I say this because 6 hours before the M6.1 we had a
> M4 but at 12km deep and at about  6 miles away... it rattled everything
> but for a shorter time. Here is the edited comment:
>
> "The story begun last midnight. I just came home from a hospital check in
> Florida at about 0300 UTC. At exactly 0600 UTC we had a very strong
> movement but short in duration. I was not in the mood to check it in the
> computer at that very time, but it called every one's attention. This
> morning while I was checking the data logger pc and calculating the P and
> S locations in the trace of the midnight event, all of the sudden I felt a
> very strong vertical movement that lasted some seconds followed by an even
> stronger rocking movement. At this time every piece of glass at home was
> rattling, some books fell down from the shelves and the alarm in the cars
> went off. This event felt like it lasted forever.
>
> As I was in front of the datalogger, I were able to "watch" the event in
> real time. It begun with no previous warning or precursors and had just
> one small aftershock. The P and S arrivals were very clearly felt and
> differentiated. Rayleigh and Love waves also were felt, they had a slower
> rocking movement. The event was sensible for over 5 minutes, the sensors
> kept on moving for over 20 minutes. The traces in the pc were totally
> saturated, the sensors were literally moving from stop to stop for a
> while. An interesting and scary experience to say the least.
>
> So far there has been reports of some damages in the area near the
> epicenter, some injured but no casualties so far.
>
> An active volcano (Santiaguito), near the epicenter started to erupt
> violently just at the time of the quake and it still is abnormally
> exacerbating erupting. Others Like the Pacaya volcano and Fuego volcano
> start erupting also but with lesser intensity. They all are in the
> epicenter vicinity.
>
> If we could predict the earthquakes, I am sure these could be a very
> interesting ones to call for a seismologists meeting, I can bet nobody
> would get boring."
>
> Well hope this help to spoil your curiosity on learning more about living
> in quake territory, or to mitigate your wanting to know.
> Best regards,
> Rolando
>
> PS
> My postings are in the PSN web page. We have had several dozens of
> aftershocks since the major one...
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information. 

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Public Seismic Network Mailing List (PSN-L)


Subject: No data from the lehman seismomter
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Mon, 04 May 2009 21:45:59 +0000

Hi all

For some reason, the coil did go silent on me. I have no idea what is
wrong, I have tried to change about wire and other things that might
create this issue.

But nothing has worked, and I am out of ideas. The boom swings correctly
and everything else is working as it should be, but no data from the
coil.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: No data from the lehman seismomter
From: "tchannel"  tchannel@............ 
Date: Mon, 4 May 2009 16:34:04 -0600

Hi Jon,  I have a Lehman which gave me the same problem, it was a bad 
connector, it simply was not making contact.
Ted
----- Original Message ----- 
From: "Jón Frímann" <jonfr@.........>
To: "PSN-Postlist" <PSN-L@..............>
Sent: Monday, May 04, 2009 3:45 PM
Subject: No data from the lehman seismomter


Hi all

For some reason, the coil did go silent on me. I have no idea what is
wrong, I have tried to change about wire and other things that might
create this issue.

But nothing has worked, and I am out of ideas. The boom swings correctly
and everything else is working as it should be, but no data from the
coil.

Regards.
-- 
Jón Frímann

http://www.jonfr.com

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Subject: Re: No data from the lehman seismomter
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Mon, 04 May 2009 23:15:29 +0000

Hi

This is not the cable. This appears to be the coil. I have tried to fix
it, but it doesn't appear to work.

This happens when I just got my lehman seismomter to work as it should
have. It now has a period of ~5 seconds with out special setup (0.2Hz).

I don't know what did happen, this just stopped working. :-(

Regards.
J=F3n Fr=EDmann.

On m=E1n, 2009-05-04 at 16:34 -0600, tchannel wrote:
> Hi Jon,  I have a Lehman which gave me the same problem, it was a bad=20
> connector, it simply was not making contact.
> Ted
> ----- Original Message -----=20
> From: "J=F3n Fr=EDmann" <jonfr@.........>
> To: "PSN-Postlist" <PSN-L@..............>
> Sent: Monday, May 04, 2009 3:45 PM
> Subject: No data from the lehman seismomter
>=20
>=20
> Hi all
>=20
> For some reason, the coil did go silent on me. I have no idea what is
> wrong, I have tried to change about wire and other things that might
> create this issue.
>=20
> But nothing has worked, and I am out of ideas. The boom swings correctly
> and everything else is working as it should be, but no data from the
> coil.
>=20
> Regards.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: No data from the lehman seismomter
From: Dave Nelson  dave.nelson@............... 
Date: Tue, 05 May 2009 18:33:19 +1000

Jon

  well its about time you listened to all the good advice that you have=20
been given
over the last couple of weeks

like these   then maybe it will work for you

  1) Get the seismo on to solid ground ... no lino, carpet or any other=20
floor covering
under it

  2)  get rid  of that thick wire from the boom to the electronics

  3)  change the dampening vane to aluminium instead of steel/iron


  just to name 3 of the major faults with the seismo that have already been=
=20
talked
about   :)
    then you may start having some successes

cheers
Dave N
Sydney
Oz



At 09:45 PM 5/4/2009 +0000, you wrote:
>Hi all
>
>For some reason, the coil did go silent on me. I have no idea what is
>wrong, I have tried to change about wire and other things that might
>create this issue.
>
>But nothing has worked, and I am out of ideas. The boom swings correctly
>and everything else is working as it should be, but no data from the
>coil.
>
>Regards.
>--
>J=F3n Fr=EDmann
>
>http://www.jonfr.com
>
>__________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email PSN-L-REQUEST@.............. with
>the body of the message (first line only): unsubscribe
>See http://www.seismicnet.com/maillist.html for more information.
>
>No virus found in this incoming message.
>Checked by AVG - www.avg.com
>Version: 8.5.325 / Virus Database: 270.12.16/2094 - Release Date: 05/03/09=
=20
>16:51:00

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Subject: Re: No data from the lehman seismomter
From: Dave Nelson  dave.nelson@............... 
Date: Tue, 05 May 2009 18:36:20 +1000


Jon,
            also check the continuity of the cable to and including the coil
   the coil should have 1000 or so turns on it of fine wire,   I would=20
expect a resistance of maybe  1 to 3 ohms

Dave



At 11:15 PM 5/4/2009 +0000, you wrote:
>Hi
>
>This is not the cable. This appears to be the coil. I have tried to fix
>it, but it doesn't appear to work.
>
>This happens when I just got my lehman seismomter to work as it should
>have. It now has a period of ~5 seconds with out special setup (0.2Hz).
>
>I don't know what did happen, this just stopped working. :-(
>
>Regards.
>J=F3n Fr=EDmann.




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Public Seismic Network Mailing List (PSN-L)


Subject: RE: Pen needed for Kinemetrics PS2
From: "Kareem Lanier"  system98765@............. 
Date: Tue, 5 May 2009 08:14:45 -0700

This sounds like a good idear too.

What kind of ink should I get and from where should I obtain it?

 

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Barry Lotz
Sent: Monday, April 27, 2009 7:38 PM
To: psn-l@..............
Subject: RE: Pen needed for Kinemetrics PS2

Kareem
Someone told me years ago to add a little glycerin to the ink to increase
the ink drying time and prevent clogging. I haven't tried it.
Regards
Barry


--- On Sun, 4/26/09, Kareem Lanier <system98765@.............> wrote:


	From: Kareem Lanier <system98765@.............>
	Subject: RE: Pen needed for Kinemetrics PS2
	To: psn-l@..............
	Date: Sunday, April 26, 2009, 7:58 AM
	
	
	Thanks for your replies..
	
	I would love to get the cleaning fluid and wire. Where would one
find such
	materials? What's "OD?"
	 
	
	-----Original Message-----
	From: psn-l-request@..............
[mailto:psn-l-request@............... On
	Behalf Of ChrisAtUpw@.......
	Sent: Saturday, April
	 25, 2009 11:03 AM
	To: psn-l@..............
	Subject: Re: Pen needed for Kinemetrics PS2
	
	In a message dated 25/04/2009, system98765@............. writes:
	
		IT's a kinemetrics PS2 system and I need a new pen for it. I
can't
	seem to get a new pen from any viable sources. The manufacturer
wants to
	charge an enormous amount of money. I wasn't sure if anyone knew how
to
	make
	one or point me in that direction. It just looks like a metal tube
(very,
	very small) that has a bend in it so that makes contact with the
paper.
		
	
	Hi Kareem,
	 
	    What is the matter with your existing pen? You can buy a special
	cleaning fluid for capillary pens. You can also buy fine wire for
cleaning
	out small tubes. I usually use fine piano wire or hard Nichrome
wire, ground
	to a diagonal knife end. If you have a problem in getting cleaning
fluid,
	look for paint stripper fluid containing Methylene Chloride.
	    I can buy
	 very small bore SS tube quite easily. What is the OD of your
	existing tube? 
	 
	    Regards,
	 
	    Chris Chapman
	
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	Public Seismic Network Mailing List (PSN-L)
	
	To leave this list email PSN-L-REQUEST@.............. with 
	the body of the message (first line only): unsubscribe
	See http://www.seismicnet.com/maillist.html for more information.


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Subject: Question
From: "tchannel"  tchannel@............ 
Date: Tue, 5 May 2009 11:26:11 -0600

Hi Folks,   I have a question about a .psn file or .sac.   Is there =
anyway to edit an unwanted spike from a data file.   I had a .psn the =
other day, that looked very nice except for a large noise spike at the =
beginning.
This noise was just someone walking around, or a door opening etc.

It would have nice to be able to edit that out and save the change. I =
know you can filter these out to some degree, but is there a way to cut =
them out like one would do with a .wav file, using a sound file editor?


Thanks, Ted
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>Hi Folks,&nbsp;&nbsp; I have a question =
about a=20
..psn file or .sac.&nbsp;&nbsp; Is there anyway to edit an unwanted spike =
from a=20
data file.&nbsp;&nbsp; I had a .psn the other day, that looked very nice =
except=20
for a large noise spike at the beginning.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>This noise was just someone walking =
around, or a=20
door opening etc.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>It would have nice to be able to edit =
that out and=20
save the change. I know you can filter these out to some degree, but is =
there a=20
way to cut them out like one would do with a .wav file, using a sound =
file=20
editor?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Thanks, Ted</FONT></DIV></BODY></HTML>

Subject: RE: 6.1M Guatemala
From: "Kareem Lanier"  system98765@............. 
Date: Tue, 5 May 2009 10:29:47 -0700

This description of these quakes made me think about the various sensations
experienced during different earthquakes I have felt over the years. I have
often wondered whether one could distinguish between the arrival of the P
and S waves as they arrive at your location during an event. I've spent a
great deal of time listening to eyewitness accounts of quakes and usually
determined how large and the location by having listened to them. I am also
very aware that the structure and soil conditions can determine the
intensity, sharpness, etc. I will recall several quakes I have felt in the
past: 

A) 1989, Loma Prieta quake, ~70 miles away, M7.1: Very long, rolling,
gentle, swaying motion. It seemed it moved in the floor in 1.5-2' feet in
circular directions which was astonishing to me. There was absolutely no
shaking, no sharpness nor hardness about it. It was very long but in all,
this earthquake really did not shake at all. Also to note, there seemed to
be no noise (rumbling, roaring, etc.) other than car alarms I heard before
the floor began to move. 20-30 seconds or so.

B) 1991, moderate event, ~15 miles away, M4.5: This felt like a "true"
quake. House suddenly began quivering, built slightly in the side-to-side
movement than slowly faded off. Probably a few inches of horizontal motion.
No rolling, no swaying recalled. Also, there was no initial jolt or motion
often described to a Mack truck hitting the building. The only noise I heard
was the sound of the house. 5-10 seconds

C) Moderate/strong event, ~25-30 miles away, M5.0: Awakened to the quivering
motion. There may have been an initial boom or "sudden Mack truck hitting"
motion since my quake alarm was sounding. The quake alarm will only be
triggered by a sudden shock motion and not by shaking. The quivering seemed
to be happening simultaneously with the gentle swaying or rolling (as if my
apartment unit were on a turntable and that turntable was moving about half
a foot or so in various directions but slowly, all while the turntable was
being shaken.) Seemed more horizontal motion than anything else. First
quake, where I could actually hear slight rumble plus the structure noise.
10-20 seconds duration. First quake, I actually watched occur on the
seismograph as I was feeling it. The pen was maxing out for about two
minutes via L4, vertical geophone.

D) Small event, half a mile or less away from epicenter, M2.8: This was
interesting. There seemed to be two parts to this event. First, there was
one, single, quick motion of which the direction couldn't be determined
because of its "quickness". This was just like a Mack truck hitting the
house or as if everyone slammed the doors all at once. This part of the
quake was the same duration of a sneeze. It was followed by the
rolling/swaying motion that slowly faded off. The only noise heard was when
the first "boom" part of the quake occurred. This quake actually spooked me
in that it was all of a sudden and out of the blue.

E) Small event, half a mile or less, M3.0: This was as if my neighbor
slammed something big against the wall. In fact, I thought it came from my
closet door, so in a sense I could ascertain a direction. And that was it.
Just one single motion and noise. 

I just wanted to get your comments on the event descriptions and see if P,
S, or any of the surface waves are illustrated here. Any other additional
comments welcomed...


Kareem




-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of tchannel
Sent: Monday, May 04, 2009 1:04 PM
To: psn-l@..............
Subject: Re: 6.1M Guatemala

Rolando, Thank you.
Ted


----- Original Message -----
From: <rbenitez@........>
To: <psn-l@..............>
Sent: Monday, May 04, 2009 12:50 PM
Subject: Re: 6.1M Guatemala


>> Hello Rolando Benitez,  If you have time, would you tell the group about
>> your experience.
>>
>> Thanks, Ted
>
> Hello Ted,
> Here is a fragment of an email I sent few hours after the quake. I am just
> reading your msg today monday, after several days out of the country.
>
> We have had several strong quakes in the recent weeks, sometimes a lesser
> magnitude event is felt stronger when it is closer and shallower that the
> one of sunday morning, I say this because 6 hours before the M6.1 we had a
> M4 but at 12km deep and at about  6 miles away... it rattled everything
> but for a shorter time. Here is the edited comment:
>
> "The story begun last midnight. I just came home from a hospital check in
> Florida at about 0300 UTC. At exactly 0600 UTC we had a very strong
> movement but short in duration. I was not in the mood to check it in the
> computer at that very time, but it called every one's attention. This
> morning while I was checking the data logger pc and calculating the P and
> S locations in the trace of the midnight event, all of the sudden I felt a
> very strong vertical movement that lasted some seconds followed by an even
> stronger rocking movement. At this time every piece of glass at home was
> rattling, some books fell down from the shelves and the alarm in the cars
> went off. This event felt like it lasted forever.
>
> As I was in front of the datalogger, I were able to "watch" the event in
> real time. It begun with no previous warning or precursors and had just
> one small aftershock. The P and S arrivals were very clearly felt and
> differentiated. Rayleigh and Love waves also were felt, they had a slower
> rocking movement. The event was sensible for over 5 minutes, the sensors
> kept on moving for over 20 minutes. The traces in the pc were totally
> saturated, the sensors were literally moving from stop to stop for a
> while. An interesting and scary experience to say the least.
>
> So far there has been reports of some damages in the area near the
> epicenter, some injured but no casualties so far.
>
> An active volcano (Santiaguito), near the epicenter started to erupt
> violently just at the time of the quake and it still is abnormally
> exacerbating erupting. Others Like the Pacaya volcano and Fuego volcano
> start erupting also but with lesser intensity. They all are in the
> epicenter vicinity.
>
> If we could predict the earthquakes, I am sure these could be a very
> interesting ones to call for a seismologists meeting, I can bet nobody
> would get boring."
>
> Well hope this help to spoil your curiosity on learning more about living
> in quake territory, or to mitigate your wanting to know.
> Best regards,
> Rolando
>
> PS
> My postings are in the PSN web page. We have had several dozens of
> aftershocks since the major one...
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information. 

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


__________________________________________________________

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Subject: Re: Question
From: Bob Hancock  icarus@......... 
Date: Tue, 5 May 2009 11:16:34 -0700

Ted -

As you said it is a noise spike.  In that case you might be able to  
filter it out with selective flittering such as a notch or bandpass  
filter.  Larry has placed multiple filtering options in WinQuake.  I  
have had some limited success in removing spikes.  The problem is how  
much filtering to apply.  This is a trail and error process and  
depends upon the event and distance.  Closer events have generally  
higher frequencies than teleseismic event.  Again, a process of trail  
and error at best.

Maybe someone has a process that works, but I am unaware of any method  
other than filtering out the frequency of the spike and hopefully not  
distorting the rest of the seismogram.

Bob Hancock


On May 5, 2009, at 10:26 AM, tchannel wrote:

> Hi Folks,   I have a question about a .psn file or .sac.   Is there  
> anyway to edit an unwanted spike from a data file.   I had a .psn  
> the other day, that looked very nice except for a large noise spike  
> at the beginning.
> This noise was just someone walking around, or a door opening etc.
>
> It would have nice to be able to edit that out and save the change.  
> I know you can filter these out to some degree, but is there a way  
> to cut them out like one would do with a .wav file, using a sound  
> file editor?
>
>
> Thanks, Ted

<html><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; "><div>Ted =
-</div><div><br></div><div>As you said it is a noise spike. &nbsp;In =
that case you might be able to filter it out with =
selective&nbsp;flittering such as a notch or bandpass filter. =
&nbsp;Larry has placed multiple filtering options in WinQuake. &nbsp;I =
have had some limited success in removing spikes. &nbsp;The problem is =
how much filtering to apply. &nbsp;This is a trail and error process and =
depends upon the event and distance. &nbsp;Closer events have generally =
higher frequencies than teleseismic event. &nbsp;Again, a process of =
trail and error at =
best.</div><div><br></div><div>Maybe&nbsp;someone&nbsp;has a process =
that works, but I am unaware of any method other than filtering out the =
frequency of the spike and hopefully not&nbsp;distorting&nbsp;the rest =
of the seismogram.</div><div><br></div><div>Bob =
Hancock</div><div><br></div><br><div><div>On May 5, 2009, at 10:26 AM, =
tchannel wrote:</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite"><span class=3D"Apple-style-span" style=3D"border-collapse: =
separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; =
font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: 2; text-align: =
auto; text-indent: 0px; text-transform: none; white-space: normal; =
widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; =
-webkit-border-vertical-spacing: 0px; =
-webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: =
auto; -webkit-text-stroke-width: 0; "><div bgcolor=3D"#ffffff"><div><font =
size=3D"2" face=3D"Arial">Hi Folks,&nbsp;&nbsp; I have a question about =
a .psn file or .sac.&nbsp;&nbsp; Is there anyway to edit an unwanted =
spike from a data file.&nbsp;&nbsp; I had a .psn the other day, that =
looked very nice except for a large noise spike at the =
beginning.</font></div><div><font size=3D"2" face=3D"Arial">This noise =
was just someone walking around, or a door opening =
etc.</font></div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" face=3D"Arial">It =
would have nice to be able to edit that out and save the change. I know =
you can filter these out to some degree, but is there a way to cut them =
out like one would do with a .wav file, using a sound file =
editor?</font></div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial">Thanks, =
Ted</font></div></div></span></blockquote></div><br></body></html>=

Subject: Re: Glitch Question
From: ChrisAtUpw@.......
Date: Tue, 5 May 2009 14:29:26 EDT

 
In a message dated 05/05/2009, tchannel@............ writes:

Hi Folks,   I have a question about a  .psn file or .sac. Is there anyway 
to edit an unwanted spike from a data file.  I had a .psn the other day, that 
looked very nice except for a large noise  spike at the beginning.
This noise was just someone walking around, or a  door opening etc.



Hi Ted, Bob,
 
    Can you simply highlight and then extract the  'good' part of the 
trace, minus the glitch?
 
    AmaSeis has a glitch removal filter that can be  selected. It has a 
'Median' filter in 'Control' which gets rid of  most spikes - this looks at the 
mean value and chucks out 'obviously'  incorrect readings. It also allows 
you to re-extract part of an extracted trace.  It has the usual HP and LP 
filters.
 
    Winquake seems to have only the LP and HP filters.  I don't know of any 
filters similar to the Glitch removal or Median filters in  AmaSeis. It 
would be useful to be able to re-extract part of an extracted  trace.
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 05/05/2009, tchannel@............ writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>
  <DIV><FONT face=3DArial size=3D2>Hi Folks,&nbsp;&nbsp; I have a question=
 about a 
  .psn file or .sac. Is there anyway to edit an unwanted spike from a data=
 file. 
  I had a .psn the other day, that looked very nice except for a large noi=
se 
  spike at the beginning.</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2>This noise was just someone walking aro=
und, or a 
  door opening etc.</FONT></DIV></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Ted, Bob,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Can you simply highlight and then extract the=
 
'good' part of the trace, minus the glitch?</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;AmaSeis has a glitch removal filter that can=
 be 
selected. It has a 'Median' filter in 'Control' which gets rid of 
most&nbsp;spikes - this looks at the mean value and chucks out 'obviously'=
 
incorrect readings. It also allows you to re-extract part of an extracted=
 trace. 
It has the usual HP and LP filters.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Winquake seems to have only the LP and HP fil=
ters. 
I don't know of any filters similar to the Glitch removal or Median filter=
s in 
AmaSeis.&nbsp;It would be useful to be able to re-extract part of an extra=
cted 
trace.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Re: Glitch Question
From: Bob Hancock  icarus@......... 
Date: Tue, 5 May 2009 11:44:38 -0700

Chris -

That is interesting.  I have never used AmaSeiz, and was unaware of  
the Glitch Filter with AmaSeiz.

Bob Hancock

On May 5, 2009, at 11:29 AM, ChrisAtUpw@....... wrote:

>
<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div>Chris -</div><div><br></div><div>That is interesting. &nbsp;I have never used AmaSeiz, and was unaware of the Glitch Filter with AmaSeiz.</div><div><br></div><div>Bob Hancock</div><br><div><div>On May 5, 2009, at 11:29 AM, <a href="mailto:ChrisAtUpw@aol.com">ChrisAtUpw@aol.com</a> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"> <div id="role_body" style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: Arial" bottommargin="7" leftmargin="7" topmargin="7" rightmargin="7"><font id="role_document" face="Arial" color="#000000" size="2"> <div> <div><br></div></div></font></div></blockquote></div></body></html>

Subject: Re: Question
From: rbenitez@........
Date: Tue, 5 May 2009 12:46:25 -0500 (CDT)

> Hi Folks,   I have a question about a .psn file or .sac.   Is there anyway
> to edit an unwanted spike from a data file.   I had a .psn the other day,
> that looked very nice except for a large noise spike at the beginning.
> This noise was just someone walking around, or a door opening etc.
>
> It would have nice to be able to edit that out and save the change. I know
> you can filter these out to some degree, but is there a way to cut them
> out like one would do with a .wav file, using a sound file editor?
>
>
> Thanks, Ted

Hello Ted,
There is a way to edit a psn or sac file with your sound file editor.
Sometimes I have had exactly what your described: noises from someone
walking around. What I have done is open your psn or sac file with
Winquake and then save your file in psn text format, then with a text
editor like Windows wordpad, -notepad does not work- remove the text
header in the file, then you can load this file in the sound file editor,
-I have used CoolEdit Pro, which now is an Adobe product-, you can display
the tracing and zoom in down to sample level, you can modified the
amplitude of the unwanted peaks, as well as filtering, etc. After you have
edited your wave, you have to save it and open it again with the text
editor and add at the top the before removed header text, save it again.
Now you can open it with WinQuake and save it again as .psn or .sac. While
in the audio editor you can play the wave and have an idea of what the
quake would sound like if it were in a higher frequency...

I have done this with audio from quakes, radio telescopes and ULF
monitoring. Once it is a wave there is ways to work with them...

Hope this helps.
Regards,
Rolando

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Subject: Lehman damping
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Tue, 05 May 2009 22:52:04 +0000

Hi all

I was told to move the damping plate and the magnets 90=B0 from where they
currently are, so the movement would be in the same direction as the arm
moves.

Can anyone explain to me why that is better ?

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Question
From: "Dale Hardy"  photon1@........... 
Date: Wed, 6 May 2009 09:29:46 +1000

Hi Ted,
If you are using WinSDR you can use

File> Replay=20
select the channel and time including the time span
click Start>
in the replayed window click a point after after your 'glitch' and
File> Zero Data
Then repeat the process of Replay> select the <Save Event> window and =
open Winquake
does that help ?
  ----- Original Message -----=20
  From: tchannel=20
  To: psn=20
  Sent: Wednesday, May 06, 2009 3:26 AM
  Subject: Question


  Hi Folks,   I have a question about a .psn file or .sac.   Is there =
anyway to edit an unwanted spike from a data file.   I had a .psn the =
other day, that looked very nice except for a large noise spike at the =
beginning.
  This noise was just someone walking around, or a door opening etc.

  It would have nice to be able to edit that out and save the change. I =
know you can filter these out to some degree, but is there a way to cut =
them out like one would do with a .wav file, using a sound file editor?


  Thanks, Ted


-------------------------------------------------------------------------=
-----



  No virus found in this incoming message.
  Checked by AVG - www.avg.com=20
  Version: 8.5.287 / Virus Database: 270.12.18/2096 - Release Date: =
05/04/09 17:51:00
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
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<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hi Ted,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>If you are using WinSDR you can =
use</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>File&gt; Replay </FONT></DIV>
<DIV><FONT face=3DArial size=3D2>select the channel and time including =
the time=20
span</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>click Start&gt;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>in the replayed window&nbsp;click a =
point after=20
after your 'glitch' and</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>File&gt; Zero Data</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Then repeat the process of =
Replay&gt;&nbsp;select=20
the &lt;Save&nbsp;Event&gt; window&nbsp;and open Winquake</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>does that help ?</FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Dtchannel@...............
  href=3D"mailto:tchannel@............">tchannel</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, May 06, 2009 =
3:26=20
  AM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Question</DIV>
  <DIV><BR></DIV>
  <DIV><FONT face=3DArial size=3D2>Hi Folks,&nbsp;&nbsp; I have a =
question about a=20
  .psn file or .sac.&nbsp;&nbsp; Is there anyway to edit an unwanted =
spike from=20
  a data file.&nbsp;&nbsp; I had a .psn the other day, that looked very =
nice=20
  except for a large noise spike at the beginning.</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2>This noise was just someone walking =
around, or a=20
  door opening etc.</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>It would have nice to be able to edit =
that out=20
  and save the change. I know you can filter these out to some degree, =
but is=20
  there a way to cut them out like one would do with a .wav file, using =
a sound=20
  file editor?</FONT></DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT face=3DArial size=3D2>Thanks, Ted</FONT></DIV>
  <P>
  <HR>

  <P></P><BR>No virus found in this incoming message.<BR>Checked by AVG =
-=20
  www.avg.com <BR>Version: 8.5.287 / Virus Database: 270.12.18/2096 - =
Release=20
  Date: 05/04/09 17:51:00<BR></BLOCKQUOTE></BODY></HTML>

Subject: Re: Question
From: "tchannel"  tchannel@............ 
Date: Tue, 5 May 2009 18:30:30 -0600

Hi Folks,  Thanks for several ideas.   I am using AmaSeis on one machine =
and WinSDR on the others, so I though I would try these various ideas on =
both.

I found one simple way to remove a single spike.   It was pointed out I =
could save the winquake file as a .txt, open it in a word editing =
program, look for the offending spike, now as numbers and replace them =
with zero, or use adjacent numbers.

  Here is an example,

I had a nice .psn file, 3/4 of the way through it I had a large spike, =
obvious just a spike of noise.  I saved the .psn as a .txt, opened it in =
Word.   Now I have a list of 2500 numbers,  I scrolled down the list of =
number until I was about 3/4 of the way down.   In that area I saw =
numbers in the 10 -20 30 -40 small numbers like that.  In this area I =
found three or four numbers in the 100's.   These were the spike, I =
replaced all four numbers with zeros, save the file.   Reopened it in =
Winquake and the spike was gone.

This may not the best way to do it, perhaps, but it was very simple, and =
it worked on those one or two offending spikes.
Thanks, Ted
  ----- Original Message -----=20
  From: Dale Hardy=20
  To: psn-l@.................
  Sent: Tuesday, May 05, 2009 5:29 PM
  Subject: Re: Question


  Hi Ted,
  If you are using WinSDR you can use

  File> Replay=20
  select the channel and time including the time span
  click Start>
  in the replayed window click a point after after your 'glitch' and
  File> Zero Data
  Then repeat the process of Replay> select the <Save Event> window and =
open Winquake
  does that help ?
    ----- Original Message -----=20
    From: tchannel=20
    To: psn=20
    Sent: Wednesday, May 06, 2009 3:26 AM
    Subject: Question


    Hi Folks,   I have a question about a .psn file or .sac.   Is there =
anyway to edit an unwanted spike from a data file.   I had a .psn the =
other day, that looked very nice except for a large noise spike at the =
beginning.
    This noise was just someone walking around, or a door opening etc.

    It would have nice to be able to edit that out and save the change. =
I know you can filter these out to some degree, but is there a way to =
cut them out like one would do with a .wav file, using a sound file =
editor?


    Thanks, Ted


-------------------------------------------------------------------------=
---



    No virus found in this incoming message.
    Checked by AVG - www.avg.com=20
    Version: 8.5.287 / Virus Database: 270.12.18/2096 - Release Date: =
05/04/09 17:51:00
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>Hi Folks,&nbsp; Thanks for several=20
ideas.&nbsp;&nbsp; I am using AmaSeis on one machine and WinSDR on the =
others,=20
so I though I would try these various&nbsp;ideas on both.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>I found one simple way to remove a =
single=20
spike.&nbsp;&nbsp; It was pointed out I could save the winquake file as =
a .txt,=20
open it in a word editing program, look for the offending spike, now as =
numbers=20
and replace them with zero, or&nbsp;use adjacent numbers.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>&nbsp; Here is an example,</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>I had a nice .psn file, 3/4 of the way =
through it I=20
had a large spike, obvious just a spike of noise.&nbsp; I saved the .psn =
as a=20
..txt, opened it in Word.&nbsp;&nbsp; Now I have a list of 2500 =
numbers,&nbsp; I=20
scrolled down the list of number until I was about 3/4 of the way=20
down.&nbsp;&nbsp; In that area I saw numbers in the 10 -20 30 -40 small =
numbers=20
like that.&nbsp; In this area I found three or four numbers in the=20
100's.&nbsp;&nbsp; These were the spike, I replaced all four numbers =
with zeros,=20
save the file.&nbsp;&nbsp; Reopened it in Winquake and the spike was=20
gone.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>This&nbsp;may not the best way to do =
it, perhaps,=20
but it was very simple, and it worked on those one or two offending=20
spikes.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Thanks, Ted</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
  <A title=3Dphoton1@........... =
href=3D"mailto:photon1@...........">Dale Hardy</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, May 05, 2009 =
5:29 PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: Question</DIV>
  <DIV><BR></DIV>
  <DIV><FONT size=3D2 face=3DArial>Hi Ted,</FONT></DIV>
  <DIV><FONT size=3D2 face=3DArial>If you are using WinSDR you can =
use</FONT></DIV>
  <DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
  <DIV><FONT size=3D2 face=3DArial>File&gt; Replay </FONT></DIV>
  <DIV><FONT size=3D2 face=3DArial>select the channel and time including =
the time=20
  span</FONT></DIV>
  <DIV><FONT size=3D2 face=3DArial>click Start&gt;</FONT></DIV>
  <DIV><FONT size=3D2 face=3DArial>in the replayed window&nbsp;click a =
point after=20
  after your 'glitch' and</FONT></DIV>
  <DIV><FONT size=3D2 face=3DArial>File&gt; Zero Data</FONT></DIV>
  <DIV><FONT size=3D2 face=3DArial>Then repeat the process of =
Replay&gt;&nbsp;select=20
  the &lt;Save&nbsp;Event&gt; window&nbsp;and open Winquake</FONT></DIV>
  <DIV><FONT size=3D2 face=3DArial>does that help ?</FONT></DIV>
  <BLOCKQUOTE=20
  style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
    <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
    <DIV=20
    style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
    <A title=3Dtchannel@...............
    href=3D"mailto:tchannel@............">tchannel</A> </DIV>
    <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
    href=3D"mailto:psn-l@..............">psn</A> </DIV>
    <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, May 06, 2009 =
3:26=20
    AM</DIV>
    <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Question</DIV>
    <DIV><BR></DIV>
    <DIV><FONT size=3D2 face=3DArial>Hi Folks,&nbsp;&nbsp; I have a =
question about a=20
    .psn file or .sac.&nbsp;&nbsp; Is there anyway to edit an unwanted =
spike=20
    from a data file.&nbsp;&nbsp; I had a .psn the other day, that =
looked very=20
    nice except for a large noise spike at the beginning.</FONT></DIV>
    <DIV><FONT size=3D2 face=3DArial>This noise was just someone walking =
around, or=20
    a door opening etc.</FONT></DIV>
    <DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2 face=3DArial>It would have nice to be able to =
edit that out=20
    and save the change. I know you can filter these out to some degree, =
but is=20
    there a way to cut them out like one would do with a .wav file, =
using a=20
    sound file editor?</FONT></DIV>
    <DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2 face=3DArial>Thanks, Ted</FONT></DIV>
    <P>
    <HR>

    <P></P><BR>No virus found in this incoming message.<BR>Checked by =
AVG -=20
    www.avg.com <BR>Version: 8.5.287 / Virus Database: 270.12.18/2096 - =
Release=20
    Date: 05/04/09 17:51:00<BR></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>

Subject: Re: Lehman damping
From: Robert McClure  bobmcclure90@......... 
Date: Wed, 6 May 2009 16:20:24 -0400

Hi J=F3n

  I advised you to rotate the damping vane 90 degrees. I said nothing
about the magnet.

  It is difficult to make anything clear to you, especially without
pictures, but I will try.

  I assume that you are using a four-pole magnet assembly, having two
steel plates and a pair of side-by-side Neodymium block magnets of
opposite polarity on each plate. The steel plates are held apart with
bolts so that an air gap exists between the pair of magnets on the top
plate and the pair on the bottom plates. The plates are oriented in
the direction that gives strong attraction accross the gap. The
"cracks" between the pairs of block magnets should always be
perpendicular to the direction of motion of the damping vane.

  The damping vane should be made of thick copper sheet (or a stack of
thinner sheets) and rectangular in shape. Its width should be
appreciably greater than the width spanned by the magnet field
generated in the magnet assembly. The vane should be mounted below the
boom, with its long dimension parallel to the boom. The amount of
damping achieved by the penetration of the vane into the magnet gap is
then controlled by the longitudinal position of the magnet. Less
damping is achieved by moving the magnet so that it covers less of the
vane. Maximum damping occurs when the vane penetrates the entire gap.

  When you set up the vane to enter the magnet assembly from the side
rather than from an end, you do not have the ability to adjust damping
because the damping is then a nonlinear function of depth of
penetration into the magnet. Never use such a configuration.

  You could always elect to mount the damping vane perpendicular to
the boom, with the long dimension vertical. In this case, the magnet
and its "cracks" are vertical, and the magnet assembly is moved
up-and-down to adjust damping.

  The reason for making the vane wider than the field is this: pure
copper is slightly diamagnetic, and impure copper can even be
paramagnetic. Aluminum can be used, but it is paramagnetic. A narrow
vane is thus subject to magnetic forces from fringe fields inside the
magnet. Making the vane wider than the fringe fields keeps the edges
of the vane outside the fringe fields and minimizes such forces.

Bob

On 5/5/09, J=F3n Fr=EDmann <jonfr@.........> wrote:
> Hi all
>
> I was told to move the damping plate and the magnets 90=B0 from where the=
y
> currently are, so the movement would be in the same direction as the arm
> moves.
>
> Can anyone explain to me why that is better ?
>
> Regards.
> --
> J=F3n Fr=EDmann
>
> http://www.jonfr.com
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
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Subject: Incresing the period of a lehmans seismomter ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Thu, 07 May 2009 02:54:35 +0000

Hi all

Tomorrow I am going to make the final changes to my lehman seismomter. I
hope that this changes make the seismomter get down to 20 seconds period
at most.

The only thing that I need to know is this. What is the best way to
increase the period of my lehman seismomter ? Moving the boom down or
up ? Or do I have to do something else.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Incresing the period of a lehmans seismomter ?
From: "Dale Hardy"  photon1@........... 
Date: Thu, 7 May 2009 17:18:26 +1000

Hi Jon,
The "TILT" of your seismometer will determine the period.
A good reference article can be found here

http://jclahr.com/science/psn/swing/index.html

regards
Dale

----- Original Message ----- 
From: "Jón Frímann" <jonfr@.........>
To: "PSN-Postlist" <PSN-L@..............>
Sent: Thursday, May 07, 2009 12:54 PM
Subject: Incresing the period of a lehmans seismomter ?


Hi all

Tomorrow I am going to make the final changes to my lehman seismomter. I
hope that this changes make the seismomter get down to 20 seconds period
at most.

The only thing that I need to know is this. What is the best way to
increase the period of my lehman seismomter ? Moving the boom down or
up ? Or do I have to do something else.

Regards.
-- 
Jón Frímann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)



--------------------------------------------------------------------------------



No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.287 / Virus Database: 270.12.21/2101 - Release Date: 05/06/09 
17:58:00

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Subject: Re: Question
From: Barry Lotz  barry_lotz@............. 
Date: Thu, 7 May 2009 05:26:24 -0700 (PDT)

Hi
Audacity also has a way to zero between or before/after selected points of a wave file.
Barry.

--- On Tue, 5/5/09, rbenitez@........ <rbenitez@........> wrote:
From: rbenitez@........ <rbenitez@........>
Subject: Re: Question
To: psn-l@..............
Date: Tuesday, May 5, 2009, 10:46 AM

> Hi Folks,   I have a question about a .psn file or .sac.   Is there anyway
> to edit an unwanted spike from a data file.   I had a .psn the other day,
> that looked very nice except for a large noise spike at the beginning.
> This noise was just someone walking around, or a door opening etc.
>
> It would have nice to be able to edit that out and save the change. I know
> you can filter these out to some degree, but is there a way to cut them
> out like one would do with a .wav file, using a sound file editor?
>
>
> Thanks, Ted

Hello Ted,
There is a way to edit a psn or sac file with your sound file editor.
Sometimes I have had exactly what your described: noises from someone
walking around. What I have done is open your psn or sac file with
Winquake and then save your file in psn text format, then with a text
editor like Windows wordpad, -notepad does not work- remove the text
header in the file, then you can load this file in the sound file editor,
-I have used CoolEdit Pro, which now is an Adobe product-, you can display
the tracing and zoom in down to sample level, you can modified the
amplitude of the unwanted peaks, as well as filtering, etc. After you have
edited your wave, you have to save it and open it again with the text
editor and add at the top the before removed header text, save it again.
Now you can open it with WinQuake and save it again as .psn or .sac. While
in the audio editor you can play the wave and have an idea of what the
quake would sound like if it were in a higher frequency...

I have done this with audio from quakes, radio telescopes and ULF
monitoring. Once it is a wave there is ways to work with them...

Hope this helps.
Regards,
Rolando

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Hi<br>Audacity also has a way to zero between or before/after selected points of a wave file.<br>Barry.<br><br>--- On <b>Tue, 5/5/09, rbenitez@........ <i>&lt;rbenitez@........&gt;</i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;">From: rbenitez@........ &lt;rbenitez@........&gt;<br>Subject: Re: Question<br>To: psn-l@..............<br>Date: Tuesday, May 5, 2009, 10:46 AM<br><br><pre>&gt; Hi Folks,   I have a question about a .psn file or .sac.   Is there anyway<br>&gt; to edit an unwanted spike from a data file.   I had a .psn the other day,<br>&gt; that looked very nice except for a large noise spike at the beginning.<br>&gt; This noise was just someone walking around, or a door opening etc.<br>&gt;<br>&gt; It would have nice to be able to edit that out and save the change. I know<br>&gt; you
 can filter these out to some degree, but is there a way to cut them<br>&gt; out like one would do with a .wav file, using a sound file editor?<br>&gt;<br>&gt;<br>&gt; Thanks, Ted<br><br>Hello Ted,<br>There is a way to edit a psn or sac file with your sound file editor.<br>Sometimes I have had exactly what your described: noises from someone<br>walking around. What I have done is open your psn or sac file with<br>Winquake and then save your file in psn text format, then with a text<br>editor like Windows wordpad, -notepad does not work- remove the text<br>header in the file, then you can load this file in the sound file editor,<br>-I have used CoolEdit Pro, which now is an Adobe product-, you can display<br>the tracing and zoom in down to sample level, you can modified the<br>amplitude of the unwanted peaks, as well as filtering, etc. After you have<br>edited your wave, you have to save it and open it again with the text<br>editor and add at the top the
 before removed header text, save it again.<br>Now you can open it with WinQuake and save it again as .psn or .sac. While<br>in the audio editor you can play the wave and have an idea of what the<br>quake would sound like if it were in a higher frequency...<br><br>I have done this with audio from quakes, radio telescopes and ULF<br>monitoring. Once it is a wave there is ways to work with them...<br><br>Hope this helps.<br>Regards,<br>Rolando<br><br>__________________________________________________________<br><br>Public Seismic Network Mailing List (PSN-L)<br><br>To leave this list email PSN-L-REQUEST@SEISMICNET.COM with <br>the body of the message (first line only): unsubscribe<br>See http://www.seismicnet.com/maillist.html for more information.<br></pre></blockquote></td></tr></table>

Subject: Re: Incresing the period of a lehmans seismomter ?
From: "Geoffrey"  gmvoeth@........... 
Date: Thu, 7 May 2009 06:14:52 -0700

Isn't setting this period just a matter of
positioning the lever arm as close to
level as possible and still able to
get it to seek a zero point reliably ?

There should be a point where gravity will
fail to overcome friction.
That will be the limiting factor
in how long a free period you may achieve.

----- Original Message ----- 
From: "Jón Frímann" <jonfr@.........>
To: "PSN-Postlist" <PSN-L@..............>
Sent: Wednesday, May 06, 2009 7:54 PM
Subject: Incresing the period of a lehmans seismomter ?


Hi all

Tomorrow I am going to make the final changes to my lehman seismomter. I
hope that this changes make the seismomter get down to 20 seconds period
at most.

The only thing that I need to know is this. What is the best way to
increase the period of my lehman seismomter ? Moving the boom down or
up ? Or do I have to do something else.

Regards.
-- 
Jón Frímann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Incresing the period of a lehmans seismomter ?
From: "tchannel"  tchannel@............ 
Date: Thu, 7 May 2009 07:38:06 -0600

Hi Geoffrey,  I like the way you word this.

Thanks, Ted


----- Original Message ----- 
From: "Geoffrey" <gmvoeth@...........>
To: <psn-l@..............>
Sent: Thursday, May 07, 2009 7:14 AM
Subject: Re: Incresing the period of a lehmans seismomter ?


> Isn't setting this period just a matter of
> positioning the lever arm as close to
> level as possible and still able to
> get it to seek a zero point reliably ?
>
> There should be a point where gravity will
> fail to overcome friction.
> That will be the limiting factor
> in how long a free period you may achieve.
>
> ----- Original Message ----- 
> From: "Jón Frímann" <jonfr@.........>
> To: "PSN-Postlist" <PSN-L@..............>
> Sent: Wednesday, May 06, 2009 7:54 PM
> Subject: Incresing the period of a lehmans seismomter ?
>
>
> Hi all
>
> Tomorrow I am going to make the final changes to my lehman seismomter. I
> hope that this changes make the seismomter get down to 20 seconds period
> at most.
>
> The only thing that I need to know is this. What is the best way to
> increase the period of my lehman seismomter ? Moving the boom down or
> up ? Or do I have to do something else.
>
> Regards.
> -- 
> Jón Frímann
>
> http://www.jonfr.com
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with the body of the 
> message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information. 

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Public Seismic Network Mailing List (PSN-L)


Subject: Re: Incresing the period of a lehmans seismomter ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Thu, 07 May 2009 20:30:54 +0000

Hi

Thanks for the artical. I ran into small problem, that I have to fix
tomorrow. But the arm that I was trying to use always fell off because
of it's waight. So i did switch to the aluminum one. Using that arm now
gives me 5 seconds easy and clear signal.

However, the signal is at intrestingly narrow band, I am unsure why that
is.

Regards.
J=F3n Fr=EDmann.

On fim, 2009-05-07 at 17:18 +1000, Dale Hardy wrote:
> Hi Jon,
> The "TILT" of your seismometer will determine the period.
> A good reference article can be found here
>=20
> http://jclahr.com/science/psn/swing/index.html
>=20
> regards
> Dale
>=20
> ----- Original Message -----=20
> From: "J=F3n Fr=EDmann" <jonfr@.........>
> To: "PSN-Postlist" <PSN-L@..............>
> Sent: Thursday, May 07, 2009 12:54 PM
> Subject: Incresing the period of a lehmans seismomter ?
>=20
>=20
> Hi all
>=20
> Tomorrow I am going to make the final changes to my lehman seismomter. I
> hope that this changes make the seismomter get down to 20 seconds period
> at most.
>=20
> The only thing that I need to know is this. What is the best way to
> increase the period of my lehman seismomter ? Moving the boom down or
> up ? Or do I have to do something else.
>=20
> Regards.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Incresing the period of a lehmans seismomter ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Thu, 07 May 2009 22:35:03 +0000

Hi

I did fix the issue that I was having, so I am ready to configure my
lehman sensor to maximum period that I can find. It currently is at 5
seconds.=20

Regards.
J=F3n Fr=EDmann.

On fim, 2009-05-07 at 06:14 -0700, Geoffrey wrote:
> Isn't setting this period just a matter of
> positioning the lever arm as close to
> level as possible and still able to
> get it to seek a zero point reliably ?
>=20
> There should be a point where gravity will
> fail to overcome friction.
> That will be the limiting factor
> in how long a free period you may achieve.
>=20
> ----- Original Message -----=20
> From: "J=F3n Fr=EDmann" <jonfr@.........>
> To: "PSN-Postlist" <PSN-L@..............>
> Sent: Wednesday, May 06, 2009 7:54 PM
> Subject: Incresing the period of a lehmans seismomter ?
>=20
>=20
> Hi all
>=20
> Tomorrow I am going to make the final changes to my lehman seismomter. I
> hope that this changes make the seismomter get down to 20 seconds period
> at most.
>=20
> The only thing that I need to know is this. What is the best way to
> increase the period of my lehman seismomter ? Moving the boom down or
> up ? Or do I have to do something else.
>=20
> Regards.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Setting the period of a Lehman
From: ChrisAtUpw@.......
Date: Thu, 7 May 2009 19:47:05 EDT

 
In a message dated 07/05/2009, jonfr@......... writes:

But the  arm that I was trying to use always fell off because of it's 
weight. So I  switched to the aluminum one. Using that arm now gives me 5 seconds 
easily and  a clear signal.
However, the signal is at interestingly narrow band, I am  unsure why that 
is.



Hi there,
 
    When deciding where to mount the top suspension on  a Lehman arm, 
balance the arm + mass on a round rod and slide it along until the  mass balances 
the weight of the rest of the arm. Mount the top suspension at  this point 
and you should get zero vertical loading on the bottom  suspension. This 
greatly reduces any tendency to slip while it is in  operation. Mount both 
balls / vertical rollers on the frame for greatly improved  stability.
 
    On a Lehman, the swing axis is at a very small  angle to the local 
vertical. Changing this angle alters the natural period.  Some values are shown 
at _http://jclahr.com/science/psn/swing/index.html_ 
(http://jclahr.com/science/psn/swing/index.html)    To get a period of 20 seconds instead of 10 
seconds, you need a swing angle 1/4  that in the table. The various sorts of 
pendulum are shown at _http://www.phy.mtu.edu/~suits/PH3110/pendulums.html_ 
(http://www.phy.mtu.edu/~suits/PH3110/pendulums.html)  See  the Lehman diagram.
 
    The swing angle theta is usually set using a  vertical screw on the 
base frame close to the mass, which tilts the whole  frame. Using a single 
frame enables you to set up the sensor clearance  first, then the period and 
finally the damping without the adjustments  effecting one another. 
 
    When you have set up the natural period, you then  need to set the 
damping to about 0.7 critical to get a broad band response. Note  the balance 
position and mark it using a fibre pen. Using a ruler or similar  lever, 
gently move the mass 10 mm to one side and then release it. The mass  should 
swing 1/2 mm beyond the balance position and then slowly return to the  balance 
position. Adjust the damping until you get about this response.
 
    If you use very little damping, the  sensor will give a narrow band 
response, peaked about it's  natural period, as Jon described. I use a ~1 mm 
thick sheet of Copper for the  damping blade, but you can also use pure 
Aluminum. See _http://jclahr.com/science/psn/chapman/lehman/index.html_ 
(http://jclahr.com/science/psn/chapman/lehman/index.html)  Note  that the damping 
blade is larger than the damping magnets and can be positioned  so that it only 
partly covers the central N/S magnet junction. The damping is  increased by 
moving the magnet block so that the damping plate covers more of  the N/S 
magnet junction. It is possible to use Alnico magnets as described  in the 
1979 Sci Am article, but NdFeB rectangular block magnets are  both cheaper and 
give a stronger field. 
 
    Mounting the damping plate horizontally as  shown in the photo makes it 
much easier to adjust the  damping. See photo 
_http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototype.jpg_ 
(http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototype.jpg)  The  left hand red damping 
magnet block partly covers the Copper damping plate. The  right hand red magnet 
block covers the sensor coil attached to the square Al  block on the arm. 
Note also the rigid V wire suspension made from 7 core SS  fishing trace and 
the wind on wire adjustment at the top of the vertical column.  This Lehman 
seems to be a good design. I can set it for stable periods of  up to 60 
seconds, but it then becomes very sensitive to ground  tilts. Photos of an 
earlier prototype before the top suspension was  modified are shown at 
_http://jclahr.com/science/psn/chapman/school/MKII/index.html_ 
(http://jclahr.com/science/psn/chapman/school/MKII/index.html)  
 
    Jon, if you look at the lehman_prototype photo, you  will see a 
vertical adjusting screw with a black knob on the right hand end of  the frame. 
This controls the tilt of the whole frame and sets the period. 
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 07/05/2009, jonfr@......... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>But the 
  arm that I was trying to use always fell off because of it's weight. So=
 I 
  switched to the aluminum one. Using that arm now gives me 5 seconds easi=
ly and 
  a clear signal.<BR>However, the signal is at interestingly narrow band,=
 I am 
  unsure why that is.<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi there,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;When deciding where to mount the top suspensi=
on on 
a Lehman arm, balance the arm + mass on a round rod and slide it along unt=
il the 
mass balances the weight of the rest of the arm. Mount the top suspension=
 at 
this point and you should get zero vertical loading on the bottom 
suspension.&nbsp;This greatly reduces any tendency to slip while it is in=
 
operation. Mount both balls / vertical rollers on the frame for greatly im=
proved 
stability.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;On a Lehman, the swing axis is at a very smal=
l 
angle to the local vertical. Changing this angle alters the natural period=
.. 
Some&nbsp;values are shown at <A 
href=3D"http://jclahr.com/science/psn/swing/index.html">http://jclahr.com/=
science/psn/swing/index.html</A>&nbsp; 
To get a period of 20 seconds instead of 10 seconds, you need a swing angl=
e 1/4 
that in the table. The various sorts of pendulum are shown at <A 
href=3D"http://www.phy.mtu.edu/~suits/PH3110/pendulums.html">http://www.ph=
y.mtu.edu/~suits/PH3110/pendulums.html</A>&nbsp;See 
the Lehman diagram.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The swing angle theta is usually set using a=
 
vertical&nbsp;screw on the base frame close to the mass, which tilts the=
 whole 
frame.&nbsp;Using a single frame enables you to set up the sensor clearanc=
e 
first, then the period and finally the damping&nbsp;without the adjustment=
s 
effecting one another. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;When you have set up the natural period, you=
 then 
need to set the damping to about 0.7 critical to get a broad band response=
.. Note 
the balance position and mark it using a fibre pen. Using a ruler or simil=
ar 
lever, gently move the mass 10 mm to one side and then release it. The mas=
s 
should swing 1/2 mm beyond the balance position and then slowly return to=
 the 
balance position. Adjust the damping until you get about this response.</D=
IV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;If you use very little damping, the 
sensor&nbsp;will&nbsp;give&nbsp;a narrow band response, peaked&nbsp;about=
 it's 
natural period, as Jon described. I use a ~1 mm thick sheet of Copper for=
 the 
damping blade, but you can also use pure&nbsp;Aluminum. See <A 
href=3D"http://jclahr.com/science/psn/chapman/lehman/index.html">http://jc=
lahr.com/science/psn/chapman/lehman/index.html</A>&nbsp;Note 
that the damping blade is larger than the damping magnets and can be posit=
ioned 
so that it only partly covers the central N/S magnet junction. The damping=
 is 
increased by moving the magnet block so that the damping plate covers more=
 of 
the N/S magnet&nbsp;junction. It is possible to use Alnico magnets as desc=
ribed 
in the 1979 Sci Am article, but NdFeB rectangular block magnets are 
both&nbsp;cheaper and give a stronger field. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Mounting the&nbsp;damping plate horizontally=
 as 
shown in the photo makes it much easier to adjust the 
damping.&nbsp;See&nbsp;photo&nbsp;<A 
href=3D"http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototy=
pe.jpg">http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototy=
pe.jpg</A>&nbsp;The 
left hand red damping magnet block partly covers the Copper damping plate.=
 The 
right hand red magnet block covers the sensor coil attached to the square=
 Al 
block on the arm. Note also the rigid V wire suspension made from 7 core=
 SS 
fishing trace and the wind on wire adjustment at the top of the vertical=
 column. 
This Lehman seems&nbsp;to be a good design. I can set it for stable period=
s of 
up to 60 seconds, but it then becomes very sensitive to ground 
tilts.&nbsp;Photos of an earlier prototype before the top suspension was=
 
modified are shown at <A 
href=3D"http://jclahr.com/science/psn/chapman/school/MKII/index.html">http=
://jclahr.com/science/psn/chapman/school/MKII/index.html</A>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Jon, if you look at the lehman_prototype phot=
o, you 
will see a vertical adjusting screw with a black knob on the right hand en=
d of 
the frame. This controls the tilt of the whole frame and sets the period.=
 </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Re: Incresing the period of a lehmans seismomter ?
From: "Geoffrey"  gmvoeth@........... 
Date: Thu, 7 May 2009 17:04:41 -0700

Gee, I believe this to be one of those
garden gate seismometers.
I always thought of it as a modified
pendulum changing the acceleration of gravity
in a trigonometric fashion.
This means the mass is the lowest point on the lever arm
or you can not have stability.
It manipulates the pull of gravity
like Sine or Cosine of the angle relative
to horizontal.
I believe you guys are thinking much more
complex then myself.
You more than likely will never
take souls like me very serious.
Sort of like Rodney Dangerfield ???

----- Original Message ----- 
From: "Jón Frímann" <jonfr@.........>
To: "PSN-Postlist" <PSN-L@..............>
Sent: Wednesday, May 06, 2009 7:54 PM
Subject: Incresing the period of a lehmans seismomter ?


Hi all

Tomorrow I am going to make the final changes to my lehman seismomter. I
hope that this changes make the seismomter get down to 20 seconds period
at most.

The only thing that I need to know is this. What is the best way to
increase the period of my lehman seismomter ? Moving the boom down or
up ? Or do I have to do something else.

Regards.
-- 
Jón Frímann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Incresing the period of a lehmans seismomter ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Fri, 08 May 2009 01:08:52 +0000

Hi all

I got the period down to 6 seconds at the lower end, but at 4 seconds
the high end. But I have to do it adjust the period really slowly. I am
not sure what I can detect at 6 seconds.

Geoffrey, I know what you mean. I am trying to understand something in a
diffrent language and am trying to understand something that I have not
got a big traning on.

Regards.
J=F3n Fr=EDmann.

On fim, 2009-05-07 at 17:04 -0700, Geoffrey wrote:
> Gee, I believe this to be one of those
> garden gate seismometers.
> I always thought of it as a modified
> pendulum changing the acceleration of gravity
> in a trigonometric fashion.
> This means the mass is the lowest point on the lever arm
> or you can not have stability.
> It manipulates the pull of gravity
> like Sine or Cosine of the angle relative
> to horizontal.
> I believe you guys are thinking much more
> complex then myself.
> You more than likely will never
> take souls like me very serious.
> Sort of like Rodney Dangerfield ???
>=20
> ----- Original Message -----=20
> From: "J=F3n Fr=EDmann" <jonfr@.........>
> To: "PSN-Postlist" <PSN-L@..............>
> Sent: Wednesday, May 06, 2009 7:54 PM
> Subject: Incresing the period of a lehmans seismomter ?
>=20
>=20
> Hi all
>=20
> Tomorrow I am going to make the final changes to my lehman seismomter. I
> hope that this changes make the seismomter get down to 20 seconds period
> at most.
>=20
> The only thing that I need to know is this. What is the best way to
> increase the period of my lehman seismomter ? Moving the boom down or
> up ? Or do I have to do something else.
>=20
> Regards.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Incresing the period of a lehmans seismomter ?
From: JAMES RIDOUT  jamesridout@.............. 
Date: Fri, 8 May 2009 05:41:18 +0000 (GMT)

Jon,
=A0=A0=A0=A0=A0 I found it very confusing when setting the period for my se=
ismograph, and for a=20
long time took the period to be the time it takes the arm to swing from one=
 side to the
other.( I could never get much more than 10 seconds)!!.
=A0But apparently I am wrong, The period is the time it takes for the arm t=
o swing
past the same point in the same direction twice. So if you hold the arm tow=
ards you
=A0and let it go, as it passes the centre, start a stopwatch, then let=A0th=
e arm=A0go to the other side,
then back towards you , and as it passes the centre again press stop. This =
is the period.
=A0 Anyone please correct me if I am wrong. !!.
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 James

--- On Fri, 8/5/09, J=F3n Fr=EDmann <jonfr@.........> wrote:

From: J=F3n Fr=EDmann <jonfr@.........>
Subject: Re: Incresing the period of a lehmans seismomter ?
To: psn-l@..............
Date: Friday, 8 May, 2009, 2:08 AM

Hi all

I got the period down to 6 seconds at the lower end, but at 4 seconds
the high end. But I have to do it adjust the period really slowly. I am
not sure what I can detect at 6 seconds.

Geoffrey, I know what you mean. I am trying to understand something in a
diffrent language and am trying to understand something that I have not
got a big traning on.

Regards.
J=F3n Fr=EDmann.

On fim, 2009-05-07 at 17:04 -0700, Geoffrey wrote:
> Gee, I believe this to be one of those
> garden gate seismometers.
> I always thought of it as a modified
> pendulum changing the acceleration of gravity
> in a trigonometric fashion.
> This means the mass is the lowest point on the lever arm
> or you can not have stability.
> It manipulates the pull of gravity
> like Sine or Cosine of the angle relative
> to horizontal.
> I believe you guys are thinking much more
> complex then myself.
> You more than likely will never
> take souls like me very serious.
> Sort of like Rodney Dangerfield ???
>=20
> ----- Original Message -----=20
> From: "J=F3n Fr=EDmann" <jonfr@.........>
> To: "PSN-Postlist" <PSN-L@..............>
> Sent: Wednesday, May 06, 2009 7:54 PM
> Subject: Incresing the period of a lehmans seismomter ?
>=20
>=20
> Hi all
>=20
> Tomorrow I am going to make the final changes to my lehman seismomter. I
> hope that this changes make the seismomter get down to 20 seconds period
> at most.
>=20
> The only thing that I need to know is this. What is the best way to
> increase the period of my lehman seismomter ? Moving the boom down or
> up ? Or do I have to do something else.
>=20
> Regards.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;"><DIV>Jon,</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I found it very confusing when setting =
the period for my seismograph, and for a </DIV>
<DIV>long time took the period to be the time it takes the arm to swing fro=
m one side to the</DIV>
<DIV>other.( I could never get much more than 10 seconds)!!.</DIV>
<DIV>&nbsp;But apparently I am wrong, The period is the time it takes for t=
he arm to swing</DIV>
<DIV>past the <U>same point</U> in the <U>same</U> <U>direction twice</U>. =
So if you hold the arm towards you</DIV>
<DIV>&nbsp;and let it go, as it passes the centre, start a stopwatch, then =
let&nbsp;the arm&nbsp;go to the other side,</DIV>
<DIV>then back towards you , and as it passes the centre again press stop. =
This is the period.</DIV>
<DIV>&nbsp; Anyone please correct me if I am wrong. !!.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp; James<BR><BR>--- On <B>Fri, 8/5/09, J=F3n Fr=EDmann <I>&lt;jonfr@j=
onfr.com&gt;</I></B> wrote:<BR></DIV>
<BLOCKQUOTE style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(=
16,16,255) 2px solid">From: J=F3n Fr=EDmann &lt;jonfr@.........&gt;<BR>Subj=
ect: Re: Incresing the period of a lehmans seismomter ?<BR>To: psn-l@webtro=
nics.com<BR>Date: Friday, 8 May, 2009, 2:08 AM<BR><BR><PRE>Hi all

I got the period down to 6 seconds at the lower end, but at 4 seconds
the high end. But I have to do it adjust the period really slowly. I am
not sure what I can detect at 6 seconds.

Geoffrey, I know what you mean. I am trying to understand something in a
diffrent language and am trying to understand something that I have not
got a big traning on.

Regards.
J=F3n Fr=EDmann.

On fim, 2009-05-07 at 17:04 -0700, Geoffrey wrote:
&gt; Gee, I believe this to be one of those
&gt; garden gate seismometers.
&gt; I always thought of it as a modified
&gt; pendulum changing the acceleration of gravity
&gt; in a trigonometric fashion.
&gt; This means the mass is the lowest point on the lever arm
&gt; or you can not have stability.
&gt; It manipulates the pull of gravity
&gt; like Sine or Cosine of the angle relative
&gt; to horizontal.
&gt; I believe you guys are thinking much more
&gt; complex then myself.
&gt; You more than likely will never
&gt; take souls like me very serious.
&gt; Sort of like Rodney Dangerfield ???
&gt;=20
&gt; ----- Original Message -----=20
&gt; From: "J=F3n Fr=EDmann" &lt;jonfr@.........&gt;
&gt; To: "PSN-Postlist" &lt;PSN-L@..............&gt;
&gt; Sent: Wednesday, May 06, 2009 7:54 PM
&gt; Subject: Incresing the period of a lehmans seismomter ?
&gt;=20
&gt;=20
&gt; Hi all
&gt;=20
&gt; Tomorrow I am going to make the final changes to my lehman seismomter.=
 I
&gt; hope that this changes make the seismomter get down to 20 seconds peri=
od
&gt; at most.
&gt;=20
&gt; The only thing that I need to know is this. What is the best way to
&gt; increase the period of my lehman seismomter ? Moving the boom down or
&gt; up ? Or do I have to do something else.
&gt;=20
&gt; Regards.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

</PRE></BLOCKQUOTE></td></tr></table>

Subject: RE: Incresing the period of a lehmans seismomter ?
From: "Steve Hammond"  shammon1@............. 
Date: Thu, 7 May 2009 23:12:13 -0700

No need your correct. There are a few other tricks you can add. I pull =
the
are back with a light cotton string or even thread and then let go of =
one
end and pull it out of the way. In this way you don=92t add any =
additional
energy or vibration. The second method works well when the box is sealed =
and
you want to check the period. With the D/A recording walk up to the =
device
and stand there for 20-30 seconds and then step back a couple of yards. =
This
is the WUWA test others=92 have talked about on this list. Walk Up Walk =
Away.
This send most Lehman=92s in motion and allows the operator a method for
checking to see f the device is operational and what the dampened period =
is.
This might also help. I have pasted a chart below and if you email me =
I=92ll
send you the excel version. This is the natural period table I made from =
a
calculation I think came from Shan a longtime ago.  The heading is in =
the
upper section and ran from A1 to W1. The 100 second line ran from C1 to =
W1
and so on. I use the chart to determine how much tilt is set on my =
device
when I adjust the period. I have a 30-in boom length on my Lehman and
normally setup a 12-14 second period which means the angle on the boom =
is
between .25 to  .5 degrees.=20

Regards, Steve Hammond PSN San Jose, Aptos CA.
http://www.PublicSeismicNetwork.com

=20

=20

Boom length      Natural period @ .05 degree       Natural Period @ .1
degree         Natural Period @ .25 degree       Natural Period @ .5 =
degree
Natural Period @ .75 degree       Natural Period @ 1 degree          =
Natural
Period @ 2 degree                Natural Period @ 3 degree          =
Natural
Period @ 4 degree          Natural Period @ 5 degree          2*pi
980CM/sec^2    .05 degree sine .1 degree sign    .25 sine .5 sine   .75
degree sine 1 degree sine     2 degree sine     3 degree sine        4
degree sine     5 degree sine

=20


100         67.943   48.043   30.385   21.486   17.543   15.193   10.744
8.773     7.599     6.799     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

99           67.602   47.802   30.233   21.378   17.455   15.117   =
10.690
8.729     7.561     6.765     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

98           67.260   47.560   30.080   21.270   17.367   15.040   =
10.636
8.685     7.523     6.730     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

97           66.916   47.317   29.926   21.161   17.278   14.963   =
10.581
8.641     7.484     6.696     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

96           66.570   47.072   29.771   21.051   17.189   14.886   =
10.527
8.596     7.446     6.661     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

95           66.222   46.826   29.616   20.941   17.099   14.808   =
10.472
8.551     7.407     6.626     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

94           65.873   46.579   29.459   20.831   17.009   14.730   =
10.416
8.506     7.368     6.591     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

93           65.522   46.331   29.302   20.720   16.918   14.651   =
10.361
8.461     7.329     6.556     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

92           65.168   46.081   29.144   20.608   16.827   14.572   =
10.305
8.415     7.289     6.521     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

91           64.813   45.830   28.985   20.496   16.735   14.493   =
10.249
8.369     7.249     6.485     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

90           64.456   45.577   28.826   20.383   16.643   14.413   =
10.192
8.323     7.209     6.450     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

89           64.097   45.323   28.665   20.269   16.550   14.333   =
10.136
8.277     7.169     6.414     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

88           63.736   45.068   28.504   20.155   16.457   14.252   =
10.079
8.230     7.129     6.378     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

87           63.373   44.811   28.341   20.040   16.363   14.171   =
10.021
8.183     7.088     6.341     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

86           63.008   44.553   28.178   19.925   16.269   14.089   9.963
8.136     7.047     6.305     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

85           62.640   44.293   28.014   19.809   16.174   14.007   9.905
8.089     7.006     6.268     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

84           62.271   44.032   27.848   19.692   16.078   13.924   9.847
8.041     6.965     6.231     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

83           61.899   43.769   27.682   19.574   15.982   13.841   9.788
7.993     6.923     6.194     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

82           61.525   43.505   27.515   19.456   15.886   13.758   9.729
7.945     6.881     6.156     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

81           61.148   43.239   27.346   19.337   15.789   13.674   9.669
7.896     6.839     6.119     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

80           60.770   42.971   27.177   19.217   15.691   13.589   9.610
7.847     6.797     6.081     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

79           60.389   42.701   27.007   19.097   15.593   13.504   9.549
7.798     6.754     6.043     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

78           60.005   42.430   26.835   18.975   15.494   13.418   9.489
7.748     6.712     6.004     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

77           59.620   42.157   26.663   18.853   15.394   13.332   9.428
7.699     6.668     5.966     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

76           59.231   41.883   26.489   18.731   15.294   13.245   9.366
7.648     6.625     5.927     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

75           58.840   41.606   26.314   18.607   15.193   13.157   9.304
7.598     6.581     5.888     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

74           58.447   41.328   26.138   18.483   15.091   13.069   9.242
7.547     6.537     5.848     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

73           58.050   41.048   25.961   18.357   14.989   12.981   9.179
7.496     6.493     5.809     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

72           57.651   40.766   25.783   18.231   14.886   12.892   9.116
7.444     6.448     5.769     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

71           57.250   40.482   25.603   18.104   14.782   12.802   9.053
7.393     6.403     5.729     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

70           56.845   40.195   25.422   17.976   14.678   12.711   8.989
7.340     6.358     5.688     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

69           56.437   39.907   25.240   17.847   14.572   12.620   8.924
7.288     6.312     5.647     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

68           56.027   39.617   25.056   17.717   14.466   12.528   8.860
7.235     6.267     5.606     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

67           55.614   39.325   24.871   17.587   14.360   12.436   8.794
7.181     6.220     5.565     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

66           55.197   39.030   24.685   17.455   14.252   12.343   8.728
7.128     6.174     5.523     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

65           54.777   38.733   24.497   17.322   14.144   12.249   8.662
7.073     6.127     5.481     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

64           54.354   38.434   24.308   17.188   14.034   12.154   8.595
7.019     6.079     5.439     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

63           53.928   38.133   24.117   17.054   13.924   12.059   8.528
6.964     6.032     5.396     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

62           53.498   37.829   23.925   16.918   13.813   11.963   8.460
6.908     5.984     5.353     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

61           53.065   37.523   23.731   16.781   13.702   11.866   8.391
6.852     5.935     5.310     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

60           52.628   37.214   23.536   16.643   13.589   11.768   8.322
6.796     5.886     5.266     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

59           52.188   36.902   23.339   16.503   13.475   11.670   8.252
6.739     5.837     5.222     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

58           51.744   36.588   23.141   16.363   13.360   11.571   8.182
6.682     5.787     5.178     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

57           51.296   36.272   22.940   16.221   13.245   11.470   8.111
6.624     5.737     5.133     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

56           50.844   35.952   22.738   16.078   13.128   11.369   8.040
6.565     5.687     5.088     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

55           50.388   35.629   22.534   15.934   13.010   11.267   7.968
6.507     5.636     5.042     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

54           49.928   35.304   22.328   15.789   12.891   11.164   7.895
6.447     5.584     4.996     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

53           49.463   34.976   22.121   15.642   12.771   11.061   7.822
6.387     5.532     4.949     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

52           48.994   34.644   21.911   15.493   12.650   10.956   7.747
6.327     5.480     4.903     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

51           48.521   34.309   21.699   15.344   12.528   10.850   7.673
6.265     5.427     4.855     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

50           48.043   33.971   21.485   15.193   12.405   10.743   7.597
6.204     5.374     4.807     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

49           47.560   33.630   21.269   15.040   12.280   10.635   7.521
6.141     5.320     4.759     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

48           47.072   33.285   21.051   14.886   12.154   10.526   7.444
6.078     5.265     4.710     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

47           46.579   32.936   20.831   14.730   12.027   10.416   7.366
6.015     5.210     4.661     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

46           46.081   32.584   20.608   14.572   11.898   10.304   7.287
5.950     5.154     4.611     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

45           45.577   32.228   20.383   14.413   11.768   10.192   7.207
5.885     5.098     4.561     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

44           45.068   31.868   20.155   14.252   11.637   10.078   7.127
5.820     5.041     4.510     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

43           44.553   31.504   19.925   14.089   11.504   9.963     =
7.045
5.753     4.983     4.458     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

42           44.032   31.135   19.692   13.924   11.369   9.846     =
6.963
5.686     4.925     4.406     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

41           43.505   30.762   19.456   13.757   11.233   9.728     =
6.879
5.618     4.866     4.353     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

40           42.971   30.385   19.217   13.589   11.095   9.609     =
6.795
5.549     4.806     4.300     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

39           42.430   30.003   18.975   13.418   10.956   9.488     =
6.709
5.479     4.746     4.246     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

38           41.883   29.616   18.731   13.245   10.814   9.366     =
6.623
5.408     4.685     4.191     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

37           41.328   29.223   18.482   13.069   10.671   9.241     =
6.535
5.337     4.622     4.135     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

36           40.766   28.826   18.231   12.891   10.526   9.116     =
6.446
5.264     4.560     4.079     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

35           40.195   28.423   17.976   12.711   10.379   8.988     =
6.356
5.190     4.496     4.022     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

34           39.617   28.014   17.717   12.528   10.229   8.859     =
6.265
5.116     4.431     3.964     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

33           39.030   27.598   17.455   12.342   10.078   8.728     =
6.172
5.040     4.365     3.905     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

32           38.434   27.177   17.188   12.154   9.924     8.594     =
6.078
4.963     4.299     3.846     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

31           37.829   26.749   16.918   11.963   9.768     8.459     =
5.982
4.885     4.231     3.785     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

30           37.214   26.314   16.643   11.768   9.609     8.321     =
5.885
4.805     4.162     3.724     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

29           36.588   25.872   16.363   11.570   9.447     8.182     =
5.786
4.725     4.092     3.661     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

28           35.952   25.422   16.078   11.369   9.283     8.039     =
5.685
4.642     4.021     3.597     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

27           35.304   24.964   15.788   11.164   9.116     7.894     =
5.583
4.559     3.949     3.533     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

26           34.644   24.497   15.493   10.956   8.945     7.747     =
5.478
4.474     3.875     3.467     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

25           33.971   24.021   15.192   10.743   8.771     7.596     =
5.372
4.387     3.800     3.399     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

24           33.285   23.536   14.886   10.526   8.594     7.443     =
5.263
4.298     3.723     3.331     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

23           32.584   23.041   14.572   10.304   8.413     7.286     =
5.153
4.208     3.645     3.260     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

22           31.868   22.534   14.252   10.078   8.228     7.126     =
5.039
4.115     3.564     3.189     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

21           31.135   22.016   13.924   9.846     8.039     6.962     =
4.923
4.020     3.482     3.116     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

20           30.385   21.485   13.589   9.609     7.845     6.794     =
4.805
3.924     3.399     3.040     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

19           29.616   20.941   13.245   9.365     7.647     6.622     =
4.683
3.824     3.312     2.963     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

18           28.826   20.383   12.891   9.116     7.443     6.446     =
4.558
3.722     3.224     2.884     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

17           28.014   19.809   12.528   8.859     7.233     6.264     =
4.430
3.617     3.133     2.803     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

16           27.177   19.217   12.154   8.594     7.017     6.077     =
4.298
3.509     3.040     2.719     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

15           26.314   18.607   11.768   8.321     6.794     5.884     =
4.161
3.398     2.943     2.633     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

14           25.422   17.976   11.369   8.039     6.564     5.685     =
4.020
3.283     2.843     2.544     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

13           24.497   17.322   10.955   7.747     6.325     5.478     =
3.874
3.163     2.740     2.451     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

12           23.536   16.643   10.526   7.443     6.077     5.263     =
3.722
3.039     2.632     2.355     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

11           22.534   15.934   10.078   7.126     5.818     5.039     =
3.563
2.910     2.520     2.255     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

10           21.485   15.192   9.609     6.794     5.548     4.804     =
3.397
2.774     2.403     2.150     6.283185307       980         8.73E-04
0.001745328       0.004363309       0.008726535       0.013089596
0.017452406       0.034899497       0.052335956                =
0.069756474
0.087155743

9              20.383   14.413   9.115     6.446     5.263     4.558
3.223     2.632     2.280     2.040     6.283185307       980
8.73E-04                0.001745328       0.004363309       0.008726535
0.013089596       0.017452406       0.034899497       0.052335956
0.069756474       0.087155743

8              19.217   13.589   8.594     6.077     4.962     4.297
3.039     2.481     2.149     1.923     6.283185307       980
8.73E-04                0.001745328       0.004363309       0.008726535
0.013089596       0.017452406       0.034899497       0.052335956
0.069756474       0.087155743

7              17.976   12.711   8.039     5.685     4.641     4.020
2.843     2.321     2.011     1.799     6.283185307       980
8.73E-04                0.001745328       0.004363309       0.008726535
0.013089596       0.017452406       0.034899497       0.052335956
0.069756474       0.087155743

6              16.643   11.768   7.443     5.263     4.297     3.721
2.632     2.149     1.861     1.665     6.283185307       980
8.73E-04                0.001745328       0.004363309       0.008726535
0.013089596       0.017452406       0.034899497       0.052335956
0.069756474       0.087155743

5              15.192   10.743   6.794     4.804     3.923     3.397
2.402     1.962     1.699     1.520     6.283185307       980
8.73E-04                0.001745328       0.004363309       0.008726535
0.013089596       0.017452406       0.034899497       0.052335956
0.069756474       0.087155743

4              13.589   9.609     6.077     4.297     3.509     3.039
2.149     1.755     1.520     1.360     6.283185307       980
8.73E-04                0.001745328       0.004363309       0.008726535
0.013089596       0.017452406       0.034899497       0.052335956
0.069756474       0.087155743

3              11.768   8.321     5.263     3.721     3.039     2.631
1.861     1.520     1.316     1.178     6.283185307       980
8.73E-04                0.001745328       0.004363309       0.008726535
0.013089596       0.017452406       0.034899497       0.052335956
0.069756474       0.087155743

=20


=20


=20


=20


=20


                                If the 24cm long boom with a natural =
period
of 14.886 is tilted .0000001  or 1 micron  the boom displacement would =
be
..2143 CM


                                14.886   221.5792


                                microns                cm of movement


                                1              0.214316064


                                2              0.428632129


                                3              0.857264258


                                4              0.857264258


                                5              1.071580322


                                6              1.285896387


                                7              1.500212451


                                8              1.714528516


                                9              1.92884458


                                10           2.143160645


                                11           2.357476709


                                12           2.571792774


                                13           2.786108838


                                14           3.000424902


                                15           3.214740967


                                16           3.429057031


                                17           3.643373096


                                18           3.85768916


                                19           4.072005225


                                20           4.286321289


                                21           4.500637354


                                22           4.714953418


                                23           4.929269483


                                24           5.143585547


                                25           5.357901611


                                26           5.572217676


=20

From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of JAMES RIDOUT
Sent: Thursday, May 07, 2009 10:41 PM
To: psn-l@..............
Subject: Re: Incresing the period of a lehmans seismomter ?

=20


Jon,

      I found it very confusing when setting the period for my =
seismograph,
and for a=20

long time took the period to be the time it takes the arm to swing from =
one
side to the

other.( I could never get much more than 10 seconds)!!.

 But apparently I am wrong, The period is the time it takes for the arm =
to
swing

past the same point in the same direction twice. So if you hold the arm
towards you

 and let it go, as it passes the centre, start a stopwatch, then let the =
arm
go to the other side,

then back towards you , and as it passes the centre again press stop. =
This
is the period.

  Anyone please correct me if I am wrong. !!.

                                                                James

--- On Fri, 8/5/09, J=F3n Fr=EDmann <jonfr@.........> wrote:

From: J=F3n Fr=EDmann <jonfr@.........>
Subject: Re: Incresing the period of a lehmans seismomter ?
To: psn-l@..............
Date: Friday, 8 May, 2009, 2:08 AM

Hi all
=20
I got the period down to 6 seconds at the lower end, but at 4 seconds
the high end. But I have to do it adjust the period really slowly. I am
not sure what I can detect at 6 seconds.
=20
Geoffrey, I know what you mean. I am trying to understand something in a
diffrent language and am trying to understand something that I have not
got a big traning on.
=20
Regards.
J=F3n Fr=EDmann.
=20
On fim, 2009-05-07 at 17:04 -0700, Geoffrey wrote:
> Gee, I believe this to be one of those
> garden gate seismometers.
> I always thought of it as a modified
> pendulum changing the acceleration of gravity
> in a trigonometric fashion.
> This means the mass is the lowest point on the lever arm
> or you can not have stability.
> It manipulates the pull of gravity
> like Sine or Cosine of the angle relative
> to horizontal.
> I believe you guys are thinking much more
> complex then myself.
> You more than likely will never
> take souls like me very serious.
> Sort of like Rodney Dangerfield ???
>=20
> ----- Original Message -----=20
> From: "J=F3n Fr=EDmann" <jonfr@.........>
> To: "PSN-Postlist" <PSN-L@..............>
> Sent: Wednesday, May 06, 2009 7:54 PM
> Subject: Incresing the period of a lehmans seismomter ?
>=20
>=20
> Hi all
>=20
> Tomorrow I am going to make the final changes to my lehman seismomter. =
I
> hope that this changes make the seismomter get down to 20 seconds =
period
> at most.
>=20
> The only thing that I need to know is this. What is the best way to
> increase the period of my lehman seismomter ? Moving the boom down or
> up ? Or do I have to do something else.
>=20
> Regards.
=20
__________________________________________________________
=20
Public Seismic Network Mailing List (PSN-L)
=20

=20

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<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>No need your correct. There are a few other tricks you =
can add.
I pull the are back with a light cotton string or even thread and then =
let go
of one end and pull it out of the way. In this way you don&#8217;t add =
any
additional energy or vibration. The second method works well when the =
box is
sealed and you want to check the period. With the D/A recording walk up =
to the
device and stand there for 20-30 seconds and then step back a couple of =
yards.
This is the WUWA test others&#8217; have talked about on this list. Walk =
Up Walk
Away. This send most Lehman&#8217;s in motion and allows the operator a =
method
for checking to see f the device is operational and what the dampened =
period
is. =A0This might also help. I have pasted a chart below and if you =
email me I&#8217;ll
send you the excel version. This is the natural period table I made from =
a
calculation I think came from Shan a longtime ago. =A0The heading is in =
the upper
section and ran from A1 to W1. The 100 second line ran from C1 to W1 and =
so on.
I use the chart to determine how much tilt is set on my device when I =
adjust
the period. I have a 30-in boom length on my Lehman and =A0normally =
setup a 12-14
second period which means the angle on the boom is between .25 to =A0.5 =
degrees. <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Regards, Steve Hammond PSN San Jose, Aptos CA. =
</span><span
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'><a
href=3D"http://www.PublicSeismicNetwork.Com">http://www.PublicSeismicNetw=
ork.com</a></span><span
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497=
D'><o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><span =
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color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Boom length=A0=A0=A0=A0=A0 Natural period @ .05 =
degree=A0=A0=A0=A0=A0=A0 Natural
Period @ .1 degree=A0=A0=A0=A0=A0=A0=A0=A0 Natural Period @ .25 =
degree=A0=A0=A0=A0=A0=A0 Natural Period @
..5 degree=A0=A0=A0=A0=A0=A0=A0=A0 Natural Period @ .75 =
degree=A0=A0=A0=A0=A0=A0 Natural Period @ 1 =
degree=A0=A0=A0=A0=A0=A0=A0=A0=A0 Natural
Period @ 2 degree=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 Natural =
Period @ 3 degree=A0=A0=A0=A0=A0=A0=A0=A0=A0 Natural
Period @ 4 degree=A0=A0=A0=A0=A0=A0=A0=A0=A0 Natural Period @ 5 =
degree=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
2*pi=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 980CM/sec^2=A0=A0=A0 =
..05
degree sine .1 degree sign=A0=A0=A0 .25 sine .5 sine=A0=A0 .75 degree =
sine 1 degree sine =A0=A0=A0 2
degree sine=A0=A0=A0=A0 3 degree sine=A0=A0=A0=A0=A0=A0=A0 4 degree =
sine=A0=A0=A0=A0 5 degree sine<o:p></o:p></span></p>

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10.305=A0=A0 8.415=A0=A0=A0=A0 7.289=A0=A0=A0=A0 6.521=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>91=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 64.813=A0=A0 =
45.830=A0=A0 28.985=A0=A0 20.496=A0=A0 16.735=A0=A0 14.493=A0=A0 =
10.249=A0=A0 8.369=A0=A0=A0=A0 7.249=A0=A0=A0=A0 6.485=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>90=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 64.456=A0=A0 =
45.577=A0=A0 28.826=A0=A0 20.383=A0=A0 16.643=A0=A0 14.413=A0=A0 =
10.192=A0=A0 8.323=A0=A0=A0=A0 7.209=A0=A0=A0=A0 6.450=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>89=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 64.097=A0=A0 =
45.323=A0=A0 28.665=A0=A0 20.269=A0=A0 16.550=A0=A0 14.333=A0=A0 =
10.136=A0=A0 8.277=A0=A0=A0=A0 7.169=A0=A0=A0=A0 6.414=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>88=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 63.736=A0=A0 =
45.068=A0=A0 28.504=A0=A0 20.155=A0=A0 16.457=A0=A0 14.252=A0=A0 =
10.079=A0=A0 8.230=A0=A0=A0=A0 7.129=A0=A0=A0=A0 6.378=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>87=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 63.373=A0=A0 =
44.811=A0=A0 28.341=A0=A0 20.040=A0=A0 16.363=A0=A0 14.171=A0=A0 =
10.021=A0=A0 8.183=A0=A0=A0=A0 7.088=A0=A0=A0=A0 6.341=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>86=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 63.008=A0=A0 =
44.553=A0=A0 28.178=A0=A0 19.925=A0=A0 16.269=A0=A0 14.089=A0=A0 =
9.963=A0=A0=A0=A0 8.136=A0=A0=A0=A0 7.047=A0=A0=A0=A0 6.305=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>85=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 62.640=A0=A0 =
44.293=A0=A0 28.014=A0=A0 19.809=A0=A0 16.174=A0=A0 14.007=A0=A0 =
9.905=A0=A0=A0=A0 8.089=A0=A0=A0=A0 7.006=A0=A0=A0=A0 6.268=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>84=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 62.271=A0=A0 =
44.032=A0=A0 27.848=A0=A0 19.692=A0=A0 16.078=A0=A0 13.924=A0=A0 =
9.847=A0=A0=A0=A0 8.041=A0=A0=A0=A0 6.965=A0=A0=A0=A0 6.231=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>83=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 61.899=A0=A0 =
43.769=A0=A0 27.682=A0=A0 19.574=A0=A0 15.982=A0=A0 13.841=A0=A0 =
9.788=A0=A0=A0=A0 7.993=A0=A0=A0=A0 6.923=A0=A0=A0=A0 6.194=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>82=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 61.525=A0=A0 =
43.505=A0=A0 27.515=A0=A0 19.456=A0=A0 15.886=A0=A0 13.758=A0=A0 =
9.729=A0=A0=A0=A0 7.945=A0=A0=A0=A0 6.881=A0=A0=A0=A0 6.156=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>81=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 61.148=A0=A0 =
43.239=A0=A0 27.346=A0=A0 19.337=A0=A0 15.789=A0=A0 13.674=A0=A0 =
9.669=A0=A0=A0=A0 7.896=A0=A0=A0=A0 6.839=A0=A0=A0=A0 6.119=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>80=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 60.770=A0=A0 =
42.971=A0=A0 27.177=A0=A0 19.217=A0=A0 15.691=A0=A0 13.589=A0=A0 =
9.610=A0=A0=A0=A0 7.847=A0=A0=A0=A0 6.797=A0=A0=A0=A0 6.081=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>79=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 60.389=A0=A0 =
42.701=A0=A0 27.007=A0=A0 19.097=A0=A0 15.593=A0=A0 13.504=A0=A0 =
9.549=A0=A0=A0=A0 7.798=A0=A0=A0=A0 6.754=A0=A0=A0=A0 6.043=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>78=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 60.005=A0=A0 =
42.430=A0=A0 26.835=A0=A0 18.975=A0=A0 15.494=A0=A0 13.418=A0=A0 =
9.489=A0=A0=A0=A0 7.748=A0=A0=A0=A0 6.712=A0=A0=A0=A0 6.004=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>77=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 59.620=A0=A0 =
42.157=A0=A0 26.663=A0=A0 18.853=A0=A0 15.394=A0=A0 13.332=A0=A0 =
9.428=A0=A0=A0=A0 7.699=A0=A0=A0=A0 6.668=A0=A0=A0=A0 5.966=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>76=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 59.231=A0=A0 =
41.883=A0=A0 26.489=A0=A0 18.731=A0=A0 15.294=A0=A0 13.245=A0=A0 =
9.366=A0=A0=A0=A0 7.648=A0=A0=A0=A0 6.625=A0=A0=A0=A0 5.927=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>75=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 58.840=A0=A0 =
41.606=A0=A0 26.314=A0=A0 18.607=A0=A0 15.193=A0=A0 13.157=A0=A0 =
9.304=A0=A0=A0=A0 7.598=A0=A0=A0=A0 6.581=A0=A0=A0=A0 5.888=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>74=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 58.447=A0=A0 =
41.328=A0=A0 26.138=A0=A0 18.483=A0=A0 15.091=A0=A0 13.069=A0=A0 =
9.242=A0=A0=A0=A0 7.547=A0=A0=A0=A0 6.537=A0=A0=A0=A0 5.848=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>73=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 58.050=A0=A0 =
41.048=A0=A0 25.961=A0=A0 18.357=A0=A0 14.989=A0=A0 12.981=A0=A0 =
9.179=A0=A0=A0=A0 7.496=A0=A0=A0=A0 6.493=A0=A0=A0=A0 5.809=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>72=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 57.651=A0=A0 =
40.766=A0=A0 25.783=A0=A0 18.231=A0=A0 14.886=A0=A0 12.892=A0=A0 =
9.116=A0=A0=A0=A0 7.444=A0=A0=A0=A0 6.448=A0=A0=A0=A0 5.769=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>71=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 57.250=A0=A0 =
40.482=A0=A0 25.603=A0=A0 18.104=A0=A0 14.782=A0=A0 12.802=A0=A0 =
9.053=A0=A0=A0=A0 7.393=A0=A0=A0=A0 6.403=A0=A0=A0=A0 5.729=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>70=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 56.845=A0=A0 =
40.195=A0=A0 25.422=A0=A0 17.976=A0=A0 14.678=A0=A0 12.711=A0=A0 =
8.989=A0=A0=A0=A0 7.340=A0=A0=A0=A0 6.358=A0=A0=A0=A0 5.688=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>69=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 56.437=A0=A0 =
39.907=A0=A0 25.240=A0=A0 17.847=A0=A0 14.572=A0=A0 12.620=A0=A0 =
8.924=A0=A0=A0=A0 7.288=A0=A0=A0=A0 6.312=A0=A0=A0=A0 5.647=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>68=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 56.027=A0=A0 =
39.617=A0=A0 25.056=A0=A0 17.717=A0=A0 14.466=A0=A0 12.528=A0=A0 =
8.860=A0=A0=A0=A0 7.235=A0=A0=A0=A0 6.267=A0=A0=A0=A0 5.606=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>67=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 55.614=A0=A0 =
39.325=A0=A0 24.871=A0=A0 17.587=A0=A0 14.360=A0=A0 12.436=A0=A0 =
8.794=A0=A0=A0=A0 7.181=A0=A0=A0=A0 6.220=A0=A0=A0=A0 5.565=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>66=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 55.197=A0=A0 =
39.030=A0=A0 24.685=A0=A0 17.455=A0=A0 14.252=A0=A0 12.343=A0=A0 =
8.728=A0=A0=A0=A0 7.128=A0=A0=A0=A0 6.174=A0=A0=A0=A0 5.523=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>65=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 54.777=A0=A0 =
38.733=A0=A0 24.497=A0=A0 17.322=A0=A0 14.144=A0=A0 12.249=A0=A0 =
8.662=A0=A0=A0=A0 7.073=A0=A0=A0=A0 6.127=A0=A0=A0=A0 5.481=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>64=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 54.354=A0=A0 =
38.434=A0=A0 24.308=A0=A0 17.188=A0=A0 14.034=A0=A0 12.154=A0=A0 =
8.595=A0=A0=A0=A0 7.019=A0=A0=A0=A0 6.079=A0=A0=A0=A0 5.439=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>63=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 53.928=A0=A0 =
38.133=A0=A0 24.117=A0=A0 17.054=A0=A0 13.924=A0=A0 12.059=A0=A0 =
8.528=A0=A0=A0=A0 6.964=A0=A0=A0=A0 6.032=A0=A0=A0=A0 5.396=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>62=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 53.498=A0=A0 =
37.829=A0=A0 23.925=A0=A0 16.918=A0=A0 13.813=A0=A0 11.963=A0=A0 =
8.460=A0=A0=A0=A0 6.908=A0=A0=A0=A0 5.984=A0=A0=A0=A0 5.353=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>61=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 53.065=A0=A0 =
37.523=A0=A0 23.731=A0=A0 16.781=A0=A0 13.702=A0=A0 11.866=A0=A0 =
8.391=A0=A0=A0=A0 6.852=A0=A0=A0=A0 5.935=A0=A0=A0=A0 5.310=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>60=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 52.628=A0=A0 =
37.214=A0=A0 23.536=A0=A0 16.643=A0=A0 13.589=A0=A0 11.768=A0=A0 =
8.322=A0=A0=A0=A0 6.796=A0=A0=A0=A0 5.886=A0=A0=A0=A0 5.266=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>59=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 52.188=A0=A0 =
36.902=A0=A0 23.339=A0=A0 16.503=A0=A0 13.475=A0=A0 11.670=A0=A0 =
8.252=A0=A0=A0=A0 6.739=A0=A0=A0=A0 5.837=A0=A0=A0=A0 5.222=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>58=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 51.744=A0=A0 =
36.588=A0=A0 23.141=A0=A0 16.363=A0=A0 13.360=A0=A0 11.571=A0=A0 =
8.182=A0=A0=A0=A0 6.682=A0=A0=A0=A0 5.787=A0=A0=A0=A0 5.178=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>57=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 51.296=A0=A0 =
36.272=A0=A0 22.940=A0=A0 16.221=A0=A0 13.245=A0=A0 11.470=A0=A0 =
8.111=A0=A0=A0=A0 6.624=A0=A0=A0=A0 5.737=A0=A0=A0=A0 5.133=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>56=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 50.844=A0=A0 =
35.952=A0=A0 22.738=A0=A0 16.078=A0=A0 13.128=A0=A0 11.369=A0=A0 =
8.040=A0=A0=A0=A0 6.565=A0=A0=A0=A0 5.687=A0=A0=A0=A0 5.088=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>55=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 50.388=A0=A0 =
35.629=A0=A0 22.534=A0=A0 15.934=A0=A0 13.010=A0=A0 11.267=A0=A0 =
7.968=A0=A0=A0=A0 6.507=A0=A0=A0=A0 5.636=A0=A0=A0=A0 5.042=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>54=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 49.928=A0=A0 =
35.304=A0=A0 22.328=A0=A0 15.789=A0=A0 12.891=A0=A0 11.164=A0=A0 =
7.895=A0=A0=A0=A0 6.447=A0=A0=A0=A0 5.584=A0=A0=A0=A0 4.996=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>53=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 49.463=A0=A0 =
34.976=A0=A0 22.121=A0=A0 15.642=A0=A0 12.771=A0=A0 11.061=A0=A0 =
7.822=A0=A0=A0=A0 6.387=A0=A0=A0=A0 5.532=A0=A0=A0=A0 4.949=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>52=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 48.994=A0=A0 =
34.644=A0=A0 21.911=A0=A0 15.493=A0=A0 12.650=A0=A0 10.956=A0=A0 =
7.747=A0=A0=A0=A0 6.327=A0=A0=A0=A0 5.480=A0=A0=A0=A0 4.903=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>51=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 48.521=A0=A0 =
34.309=A0=A0 21.699=A0=A0 15.344=A0=A0 12.528=A0=A0 10.850=A0=A0 =
7.673=A0=A0=A0=A0 6.265=A0=A0=A0=A0 5.427=A0=A0=A0=A0 4.855=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>50=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 48.043=A0=A0 =
33.971=A0=A0 21.485=A0=A0 15.193=A0=A0 12.405=A0=A0 10.743=A0=A0 =
7.597=A0=A0=A0=A0 6.204=A0=A0=A0=A0 5.374=A0=A0=A0=A0 4.807=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>49=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 47.560=A0=A0 =
33.630=A0=A0 21.269=A0=A0 15.040=A0=A0 12.280=A0=A0 10.635=A0=A0 =
7.521=A0=A0=A0=A0 6.141=A0=A0=A0=A0 5.320=A0=A0=A0=A0 4.759=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>48=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 47.072=A0=A0 =
33.285=A0=A0 21.051=A0=A0 14.886=A0=A0 12.154=A0=A0 10.526=A0=A0 =
7.444=A0=A0=A0=A0 6.078=A0=A0=A0=A0 5.265=A0=A0=A0=A0 4.710=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>47=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 46.579=A0=A0 =
32.936=A0=A0 20.831=A0=A0 14.730=A0=A0 12.027=A0=A0 10.416=A0=A0 =
7.366=A0=A0=A0=A0 6.015=A0=A0=A0=A0 5.210=A0=A0=A0=A0 4.661=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>46=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 46.081=A0=A0 =
32.584=A0=A0 20.608=A0=A0 14.572=A0=A0 11.898=A0=A0 10.304=A0=A0 =
7.287=A0=A0=A0=A0 5.950=A0=A0=A0=A0 5.154=A0=A0=A0=A0 4.611=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>45=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 45.577=A0=A0 =
32.228=A0=A0 20.383=A0=A0 14.413=A0=A0 11.768=A0=A0 10.192=A0=A0 =
7.207=A0=A0=A0=A0 5.885=A0=A0=A0=A0 5.098=A0=A0=A0=A0 4.561=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>44=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 45.068=A0=A0 =
31.868=A0=A0 20.155=A0=A0 14.252=A0=A0 11.637=A0=A0 10.078=A0=A0 =
7.127=A0=A0=A0=A0 5.820=A0=A0=A0=A0 5.041=A0=A0=A0=A0 4.510=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>43=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 44.553=A0=A0 =
31.504=A0=A0 19.925=A0=A0 14.089=A0=A0 11.504=A0=A0 9.963=A0=A0=A0=A0 =
7.045=A0=A0=A0=A0 5.753=A0=A0=A0=A0 4.983=A0=A0=A0=A0 4.458=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>42=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 44.032=A0=A0 =
31.135=A0=A0 19.692=A0=A0 13.924=A0=A0 11.369=A0=A0 9.846=A0=A0=A0=A0 =
6.963=A0=A0=A0=A0 5.686=A0=A0=A0=A0 4.925=A0=A0=A0=A0 4.406=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>41=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 43.505=A0=A0 =
30.762=A0=A0 19.456=A0=A0 13.757=A0=A0 11.233=A0=A0 9.728=A0=A0=A0=A0 =
6.879=A0=A0=A0=A0 5.618=A0=A0=A0=A0 4.866=A0=A0=A0=A0 4.353=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>40=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 42.971=A0=A0 =
30.385=A0=A0 19.217=A0=A0 13.589=A0=A0 11.095=A0=A0 9.609=A0=A0=A0=A0 =
6.795=A0=A0=A0=A0 5.549=A0=A0=A0=A0 4.806=A0=A0=A0=A0 4.300=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>39=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 42.430=A0=A0 =
30.003=A0=A0 18.975=A0=A0 13.418=A0=A0 10.956=A0=A0 9.488=A0=A0=A0=A0 =
6.709=A0=A0=A0=A0 5.479=A0=A0=A0=A0 4.746=A0=A0=A0=A0 4.246=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>38=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 41.883=A0=A0 =
29.616=A0=A0 18.731=A0=A0 13.245=A0=A0 10.814=A0=A0 9.366=A0=A0=A0=A0 =
6.623=A0=A0=A0=A0 5.408=A0=A0=A0=A0 4.685=A0=A0=A0=A0 4.191=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>37=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 41.328=A0=A0 =
29.223=A0=A0 18.482=A0=A0 13.069=A0=A0 10.671=A0=A0 9.241=A0=A0=A0=A0 =
6.535=A0=A0=A0=A0 5.337=A0=A0=A0=A0 4.622=A0=A0=A0=A0 4.135=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>36=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 40.766=A0=A0 =
28.826=A0=A0 18.231=A0=A0 12.891=A0=A0 10.526=A0=A0 9.116=A0=A0=A0=A0 =
6.446=A0=A0=A0=A0 5.264=A0=A0=A0=A0 4.560=A0=A0=A0=A0 4.079=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>35=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 40.195=A0=A0 =
28.423=A0=A0 17.976=A0=A0 12.711=A0=A0 10.379=A0=A0 8.988=A0=A0=A0=A0 =
6.356=A0=A0=A0=A0 5.190=A0=A0=A0=A0 4.496=A0=A0=A0=A0 4.022=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>34=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 39.617=A0=A0 =
28.014=A0=A0 17.717=A0=A0 12.528=A0=A0 10.229=A0=A0 8.859=A0=A0=A0=A0 =
6.265=A0=A0=A0=A0 5.116=A0=A0=A0=A0 4.431=A0=A0=A0=A0 3.964=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>33=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 39.030=A0=A0 =
27.598=A0=A0 17.455=A0=A0 12.342=A0=A0 10.078=A0=A0 8.728=A0=A0=A0=A0 =
6.172=A0=A0=A0=A0 5.040=A0=A0=A0=A0 4.365=A0=A0=A0=A0 3.905=A0=A0=A0=A0 =
6.283185307=A0=A0=A0=A0=A0=A0 980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>32=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 38.434=A0=A0 =
27.177=A0=A0 17.188=A0=A0 12.154=A0=A0 9.924=A0=A0=A0=A0 =
8.594=A0=A0=A0=A0 6.078=A0=A0=A0=A0 4.963=A0=A0=A0=A0 4.299=A0=A0=A0=A0 =
3.846=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>31=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 37.829=A0=A0 =
26.749=A0=A0 16.918=A0=A0 11.963=A0=A0 9.768=A0=A0=A0=A0 =
8.459=A0=A0=A0=A0 5.982=A0=A0=A0=A0 4.885=A0=A0=A0=A0 4.231=A0=A0=A0=A0 =
3.785=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>30=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 37.214=A0=A0 =
26.314=A0=A0 16.643=A0=A0 11.768=A0=A0 9.609=A0=A0=A0=A0 =
8.321=A0=A0=A0=A0 5.885=A0=A0=A0=A0 4.805=A0=A0=A0=A0 4.162=A0=A0=A0=A0 =
3.724=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>29=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 36.588=A0=A0 =
25.872=A0=A0 16.363=A0=A0 11.570=A0=A0 9.447=A0=A0=A0=A0 =
8.182=A0=A0=A0=A0 5.786=A0=A0=A0=A0 4.725=A0=A0=A0=A0 4.092=A0=A0=A0=A0 =
3.661=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>28=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 35.952=A0=A0 =
25.422=A0=A0 16.078=A0=A0 11.369=A0=A0 9.283=A0=A0=A0=A0 =
8.039=A0=A0=A0=A0 5.685=A0=A0=A0=A0 4.642=A0=A0=A0=A0 4.021=A0=A0=A0=A0 =
3.597=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>27=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 35.304=A0=A0 =
24.964=A0=A0 15.788=A0=A0 11.164=A0=A0 9.116=A0=A0=A0=A0 =
7.894=A0=A0=A0=A0 5.583=A0=A0=A0=A0 4.559=A0=A0=A0=A0 3.949=A0=A0=A0=A0 =
3.533=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>26=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 34.644=A0=A0 =
24.497=A0=A0 15.493=A0=A0 10.956=A0=A0 8.945=A0=A0=A0=A0 =
7.747=A0=A0=A0=A0 5.478=A0=A0=A0=A0 4.474=A0=A0=A0=A0 3.875=A0=A0=A0=A0 =
3.467=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>25=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 33.971=A0=A0 =
24.021=A0=A0 15.192=A0=A0 10.743=A0=A0 8.771=A0=A0=A0=A0 =
7.596=A0=A0=A0=A0 5.372=A0=A0=A0=A0 4.387=A0=A0=A0=A0 3.800=A0=A0=A0=A0 =
3.399=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>24=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 33.285=A0=A0 =
23.536=A0=A0 14.886=A0=A0 10.526=A0=A0 8.594=A0=A0=A0=A0 =
7.443=A0=A0=A0=A0 5.263=A0=A0=A0=A0 4.298=A0=A0=A0=A0 3.723=A0=A0=A0=A0 =
3.331=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>23=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 32.584=A0=A0 =
23.041=A0=A0 14.572=A0=A0 10.304=A0=A0 8.413=A0=A0=A0=A0 =
7.286=A0=A0=A0=A0 5.153=A0=A0=A0=A0 4.208=A0=A0=A0=A0 3.645=A0=A0=A0=A0 =
3.260=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>22=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 31.868=A0=A0 =
22.534=A0=A0 14.252=A0=A0 10.078=A0=A0 8.228=A0=A0=A0=A0 =
7.126=A0=A0=A0=A0 5.039=A0=A0=A0=A0 4.115=A0=A0=A0=A0 3.564=A0=A0=A0=A0 =
3.189=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>21=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 31.135=A0=A0 =
22.016=A0=A0 13.924=A0=A0 9.846=A0=A0=A0=A0 8.039=A0=A0=A0=A0 =
6.962=A0=A0=A0=A0 4.923=A0=A0=A0=A0 4.020=A0=A0=A0=A0 3.482=A0=A0=A0=A0 =
3.116=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>20=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 30.385=A0=A0 =
21.485=A0=A0 13.589=A0=A0 9.609=A0=A0=A0=A0 7.845=A0=A0=A0=A0 =
6.794=A0=A0=A0=A0 4.805=A0=A0=A0=A0 3.924=A0=A0=A0=A0 3.399=A0=A0=A0=A0 =
3.040=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>19=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 29.616=A0=A0 =
20.941=A0=A0 13.245=A0=A0 9.365=A0=A0=A0=A0 7.647=A0=A0=A0=A0 =
6.622=A0=A0=A0=A0 4.683=A0=A0=A0=A0 3.824=A0=A0=A0=A0 3.312=A0=A0=A0=A0 =
2.963=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>18=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 28.826=A0=A0 =
20.383=A0=A0 12.891=A0=A0 9.116=A0=A0=A0=A0 7.443=A0=A0=A0=A0 =
6.446=A0=A0=A0=A0 4.558=A0=A0=A0=A0 3.722=A0=A0=A0=A0 3.224=A0=A0=A0=A0 =
2.884=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>17=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 28.014=A0=A0 =
19.809=A0=A0 12.528=A0=A0 8.859=A0=A0=A0=A0 7.233=A0=A0=A0=A0 =
6.264=A0=A0=A0=A0 4.430=A0=A0=A0=A0 3.617=A0=A0=A0=A0 3.133=A0=A0=A0=A0 =
2.803=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>16=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 27.177=A0=A0 =
19.217=A0=A0 12.154=A0=A0 8.594=A0=A0=A0=A0 7.017=A0=A0=A0=A0 =
6.077=A0=A0=A0=A0 4.298=A0=A0=A0=A0 3.509=A0=A0=A0=A0 3.040=A0=A0=A0=A0 =
2.719=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>15=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 26.314=A0=A0 =
18.607=A0=A0 11.768=A0=A0 8.321=A0=A0=A0=A0 6.794=A0=A0=A0=A0 =
5.884=A0=A0=A0=A0 4.161=A0=A0=A0=A0 3.398=A0=A0=A0=A0 2.943=A0=A0=A0=A0 =
2.633=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>14=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 25.422=A0=A0 =
17.976=A0=A0 11.369=A0=A0 8.039=A0=A0=A0=A0 6.564=A0=A0=A0=A0 =
5.685=A0=A0=A0=A0 4.020=A0=A0=A0=A0 3.283=A0=A0=A0=A0 2.843=A0=A0=A0=A0 =
2.544=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>13=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 24.497=A0=A0 =
17.322=A0=A0 10.955=A0=A0 7.747=A0=A0=A0=A0 6.325=A0=A0=A0=A0 =
5.478=A0=A0=A0=A0 3.874=A0=A0=A0=A0 3.163=A0=A0=A0=A0 2.740=A0=A0=A0=A0 =
2.451=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>12=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 23.536=A0=A0 =
16.643=A0=A0 10.526=A0=A0 7.443=A0=A0=A0=A0 6.077=A0=A0=A0=A0 =
5.263=A0=A0=A0=A0 3.722=A0=A0=A0=A0 3.039=A0=A0=A0=A0 2.632=A0=A0=A0=A0 =
2.355=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>11=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 22.534=A0=A0 =
15.934=A0=A0 10.078=A0=A0 7.126=A0=A0=A0=A0 5.818=A0=A0=A0=A0 =
5.039=A0=A0=A0=A0 3.563=A0=A0=A0=A0 2.910=A0=A0=A0=A0 2.520=A0=A0=A0=A0 =
2.255=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>10=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 21.485=A0=A0 =
15.192=A0=A0 9.609=A0=A0=A0=A0 6.794=A0=A0=A0=A0 5.548=A0=A0=A0=A0 =
4.804=A0=A0=A0=A0 3.397=A0=A0=A0=A0 2.774=A0=A0=A0=A0 2.403=A0=A0=A0=A0 =
2.150=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>9=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 20.383=A0=A0 =
14.413=A0=A0 9.115=A0=A0=A0=A0 6.446=A0=A0=A0=A0 5.263=A0=A0=A0=A0 =
4.558=A0=A0=A0=A0 3.223=A0=A0=A0=A0 2.632=A0=A0=A0=A0 2.280=A0=A0=A0=A0 =
2.040=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>8=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 19.217=A0=A0 =
13.589=A0=A0 8.594=A0=A0=A0=A0 6.077=A0=A0=A0=A0 4.962=A0=A0=A0=A0 =
4.297=A0=A0=A0=A0 3.039=A0=A0=A0=A0 2.481=A0=A0=A0=A0 2.149=A0=A0=A0=A0 =
1.923=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>7=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 17.976=A0=A0 =
12.711=A0=A0 8.039=A0=A0=A0=A0 5.685=A0=A0=A0=A0 4.641=A0=A0=A0=A0 =
4.020=A0=A0=A0=A0 2.843=A0=A0=A0=A0 2.321=A0=A0=A0=A0 2.011=A0=A0=A0=A0 =
1.799=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>6=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 16.643=A0=A0 =
11.768=A0=A0 7.443=A0=A0=A0=A0 5.263=A0=A0=A0=A0 4.297=A0=A0=A0=A0 =
3.721=A0=A0=A0=A0 2.632=A0=A0=A0=A0 2.149=A0=A0=A0=A0 1.861=A0=A0=A0=A0 =
1.665=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>5=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 15.192=A0=A0 =
10.743=A0=A0 6.794=A0=A0=A0=A0 4.804=A0=A0=A0=A0 3.923=A0=A0=A0=A0 =
3.397=A0=A0=A0=A0 2.402=A0=A0=A0=A0 1.962=A0=A0=A0=A0 1.699=A0=A0=A0=A0 =
1.520=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>4=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 13.589=A0=A0 =
9.609=A0=A0=A0=A0 6.077=A0=A0=A0=A0 4.297=A0=A0=A0=A0 3.509=A0=A0=A0=A0 =
3.039=A0=A0=A0=A0 2.149=A0=A0=A0=A0 1.755=A0=A0=A0=A0 1.520=A0=A0=A0=A0 =
1.360=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>3=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 11.768=A0=A0 =
8.321=A0=A0=A0=A0 5.263=A0=A0=A0=A0 3.721=A0=A0=A0=A0 3.039=A0=A0=A0=A0 =
2.631=A0=A0=A0=A0 1.861=A0=A0=A0=A0 1.520=A0=A0=A0=A0 1.316=A0=A0=A0=A0 =
1.178=A0=A0=A0=A0 6.283185307=A0=A0=A0=A0=A0=A0 =
980=A0=A0=A0=A0=A0=A0=A0=A0 =
8.73E-04=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.001745328=A0=A0=A0=A0=A0=A0 0.004363309=A0=A0=A0=A0=A0=A0 =
0.008726535=A0=A0=A0=A0=A0=A0 0.013089596=A0=A0=A0=A0=A0=A0 =
0.017452406=A0=A0=A0=A0=A0=A0 0.034899497=A0=A0=A0=A0=A0=A0 =
0.052335956=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.069756474=A0=A0=A0=A0=A0=A0 0.087155743<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 If the 24cm long boom with a
natural period of 14.886 is tilted .0000001=A0 or 1 micron=A0 the boom =
displacement
would be .2143 =
CM=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0 =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 14.886=A0=A0 =
221.5792=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0 =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
microns=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 cm of
movement=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
1=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.214316064=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
2=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.428632129=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
3=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.857264258=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
4=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
0.857264258=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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5=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
1.071580322=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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6=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
1.285896387=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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7=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
1.500212451=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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8=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
1.714528516=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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9=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
1.92884458=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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2.143160645=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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2.357476709=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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4.500637354=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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4.714953418=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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4.929269483=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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5.143585547=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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5.357901611=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
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5.572217676=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 =
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=
=A0=A0 <o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in'>

<p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
psn-l-request@.............. [mailto:psn-l-request@............... <b>On =
Behalf
Of </b>JAMES RIDOUT<br>
<b>Sent:</b> Thursday, May 07, 2009 10:41 PM<br>
<b>To:</b> psn-l@..............<br>
<b>Subject:</b> Re: Incresing the period of a lehmans seismomter =
?<o:p></o:p></span></p>

</div>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<table class=3DMsoNormalTable border=3D0 cellspacing=3D0 =
cellpadding=3D0>
 <tr>
  <td valign=3Dtop style=3D'padding:0in 0in 0in 0in'>
  <div>
  <p class=3DMsoNormal>Jon,<o:p></o:p></p>
  </div>
  <div>
  <p class=3DMsoNormal>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; I found it very =
confusing
  when setting the period for my seismograph, and for a <o:p></o:p></p>
  </div>
  <div>
  <p class=3DMsoNormal>long time took the period to be the time it takes =
the arm
  to swing from one side to the<o:p></o:p></p>
  </div>
  <div>
  <p class=3DMsoNormal>other.( I could never get much more than 10 =
seconds)!!.<o:p></o:p></p>
  </div>
  <div>
  <p class=3DMsoNormal>&nbsp;But apparently I am wrong, The period is =
the time it
  takes for the arm to swing<o:p></o:p></p>
  </div>
  <div>
  <p class=3DMsoNormal>past the <u>same point</u> in the <u>same</u> =
<u>direction
  twice</u>. So if you hold the arm towards you<o:p></o:p></p>
  </div>
  <div>
  <p class=3DMsoNormal>&nbsp;and let it go, as it passes the centre, =
start a
  stopwatch, then let&nbsp;the arm&nbsp;go to the other =
side,<o:p></o:p></p>
  </div>
  <div>
  <p class=3DMsoNormal>then back towards you , and as it passes the =
centre again
  press stop. This is the period.<o:p></o:p></p>
  </div>
  <div>
  <p class=3DMsoNormal>&nbsp; Anyone please correct me if I am wrong. =
!!.<o:p></o:p></p>
  </div>
  <div>
  <p =
class=3DMsoNormal>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
  James<br>
  <br>
  --- On <b>Fri, 8/5/09, J=F3n Fr=EDmann =
<i>&lt;jonfr@.........&gt;</i></b> wrote:<o:p></o:p></p>
  </div>
  <blockquote style=3D'border:none;border-left:solid #1010FF =
1.5pt;padding:0in 0in 0in 4.0pt;
  margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'>
  <p class=3DMsoNormal style=3D'margin-bottom:12.0pt'>From: J=F3n =
Fr=EDmann
  &lt;jonfr@.........&gt;<br>
  Subject: Re: Incresing the period of a lehmans seismomter ?<br>
  To: psn-l@..............<br>
  Date: Friday, 8 May, 2009, 2:08 AM<o:p></o:p></p>
  <pre>Hi all<o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>I got the =
period down to 6 seconds at the lower end, but at 4 =
seconds<o:p></o:p></pre><pre>the high end. But I have to do it adjust =
the period really slowly. I am<o:p></o:p></pre><pre>not sure what I can =
detect at 6 =
seconds.<o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>Geoffrey, I =
know what you mean. I am trying to understand something in =
a<o:p></o:p></pre><pre>diffrent language and am trying to understand =
something that I have not<o:p></o:p></pre><pre>got a big traning =
on.<o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>Regards.<o:p></o:p><=
/pre><pre>J=F3n =
Fr=EDmann.<o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>On fim, =
2009-05-07 at 17:04 -0700, Geoffrey wrote:<o:p></o:p></pre><pre>&gt; =
Gee, I believe this to be one of those<o:p></o:p></pre><pre>&gt; garden =
gate seismometers.<o:p></o:p></pre><pre>&gt; I always thought of it as a =
modified<o:p></o:p></pre><pre>&gt; pendulum changing the acceleration of =
gravity<o:p></o:p></pre><pre>&gt; in a trigonometric =
fashion.<o:p></o:p></pre><pre>&gt; This means the mass is the lowest =
point on the lever arm<o:p></o:p></pre><pre>&gt; or you can not have =
stability.<o:p></o:p></pre><pre>&gt; It manipulates the pull of =
gravity<o:p></o:p></pre><pre>&gt; like Sine or Cosine of the angle =
relative<o:p></o:p></pre><pre>&gt; to =
horizontal.<o:p></o:p></pre><pre>&gt; I believe you guys are thinking =
much more<o:p></o:p></pre><pre>&gt; complex then =
myself.<o:p></o:p></pre><pre>&gt; You more than likely will =
never<o:p></o:p></pre><pre>&gt; take souls like me very =
serious.<o:p></o:p></pre><pre>&gt; Sort of like Rodney Dangerfield =
???<o:p></o:p></pre><pre>&gt; <o:p></o:p></pre><pre>&gt; ----- Original =
Message ----- <o:p></o:p></pre><pre>&gt; From: &quot;J=F3n =
Fr=EDmann&quot; &lt;jonfr@.........&gt;<o:p></o:p></pre><pre>&gt; To: =
&quot;PSN-Postlist&quot; =
&lt;PSN-L@..............&gt;<o:p></o:p></pre><pre>&gt; Sent: Wednesday, =
May 06, 2009 7:54 PM<o:p></o:p></pre><pre>&gt; Subject: Incresing the =
period of a lehmans seismomter ?<o:p></o:p></pre><pre>&gt; =
<o:p></o:p></pre><pre>&gt; <o:p></o:p></pre><pre>&gt; Hi =
all<o:p></o:p></pre><pre>&gt; <o:p></o:p></pre><pre>&gt; Tomorrow I am =
going to make the final changes to my lehman seismomter. =
I<o:p></o:p></pre><pre>&gt; hope that this changes make the seismomter =
get down to 20 seconds period<o:p></o:p></pre><pre>&gt; at =
most.<o:p></o:p></pre><pre>&gt; <o:p></o:p></pre><pre>&gt; The only =
thing that I need to know is this. What is the best way =
to<o:p></o:p></pre><pre>&gt; increase the period of my lehman seismomter =
? Moving the boom down or<o:p></o:p></pre><pre>&gt; up ? Or do I have to =
do something else.<o:p></o:p></pre><pre>&gt; <o:p></o:p></pre><pre>&gt; =
Regards.<o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>_______________=
___________________________________________<o:p></o:p></pre><pre><o:p>&nb=
sp;</o:p></pre><pre>Public Seismic Network Mailing List =
(PSN-L)<o:p></o:p></pre><pre><o:p>&nbsp;</o:p></pre><pre>To leave this =
list email PSN-L-REQUEST@.............. with<o:p></o:p></pre><pre>the =
body of the message (first line only): =
unsubscribe<o:p></o:p></pre><pre>See =
http://www.seismicnet.com/maillist.html for more =
information.<o:p></o:p></pre></blockquote>
  </td>
 </tr>
</table>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Calibri","sans-serif"'><o:p>&nbsp;=
</o:p></span></p>

</div>

</body>

</html>

Subject: Ocean microseismic
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Fri, 08 May 2009 20:11:01 +0000

Hi all

I am decting ocean microseismic with my lehman seismometer according to
this web page.

A qoute from the web page.
"Microseisms are omnipresent energy recorded by seismometers over a
broad range of periods. Oceanic microseisms are a particularly energetic
type of microseisms occurring in the frequency band of 0.1=E2=80=931.0=E2=
=80=8AHz, and
usually dominated by wave periods of 5=E2=80=937=E2=80=8As, which are assoc=
iated with
high ocean waves of half their frequency. In a fundamental paper,
Longuet-Higgins (1950) showed that the corresponding ocean surface wave=E2=
=80=93
wave interaction could, under suitable conditions, cause pressure
oscillations at double the frequency of the ocean waves, resulting in
seismic wave generation at the ocean floor. It was shown that at shallow
depths, where the propagation time of a compression wave from the ocean
surface to the bottom is small relative to the ocean wave period, the
compressibility of the water can be ignored, resulting in a simple
formulation of the pressure forcing function. This incompressible
formulation of the theory was verified in laboratory experiments on
periodic surface gravity waves by Cooper & Longuet-Higgins (1951), and
numerous studies have used the theory to confirm the causal relationship
between the ocean and the seismic waves that they generate at double
their frequencies."

The artical can be read here.
http://rspa.royalsocietypublishing.org/content/464/2091/777.full

I live less then 800 meters from the ocean, so that signal is quite
strong on my sensor, as it peaks at 0.1Hz.

What I do wonder, will this have any effects on detecting earthquakes ?

Regards.
--=20
J=C3=B3n Fr=C3=ADmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Opinion on my lehman signal
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sat, 09 May 2009 03:47:42 +0000

Hi all

I want your opinions on my lehmans seismomter signals as they are on the
web page. I have lowpass filtered the signal down to 0.05Hz (20
seconds), but the noise in the area is really high. It even shows up on
my 4.5Hz sensor at 0.1Hz frequancy.

My earthquake web page is here.
http://www.simnet.is/jonfr500/earthquake/tremoren.htm

I am waiting for a earthquake to see if I can use this. I hope so.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Incresing the period of a lehmans seismomter ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sat, 09 May 2009 23:28:18 +0000

Hi all

Thanks for the help of the weeks. I could not have fixed the issues with
out you all.

I am still having minor issues adjusting the period of my lehman sensor.
I am not sure if I have to move the boom up or down to increase the
period of my sensor.

Regards.
J=F3n Fr=EDmann.

On f=F6s, 2009-05-08 at 05:41 +0000, JAMES RIDOUT wrote:
> Jon,
>       I found it very confusing when setting the period for my
> seismograph, and for a=20
> long time took the period to be the time it takes the arm to swing
> from one side to the
> other.( I could never get much more than 10 seconds)!!.
>  But apparently I am wrong, The period is the time it takes for the
> arm to swing
> past the same point in the same direction twice. So if you hold the
> arm towards you
>  and let it go, as it passes the centre, start a stopwatch, then
> let the arm go to the other side,
> then back towards you , and as it passes the centre again press stop.
> This is the period.
>   Anyone please correct me if I am wrong. !!.
>                                                                 James
>=20
> --- On Fri, 8/5/09, J=F3n Fr=EDmann <jonfr@.........> wrote:
>=20
>         From: J=F3n Fr=EDmann <jonfr@.........>
>         Subject: Re: Incresing the period of a lehmans seismomter ?
>         To: psn-l@..............
>         Date: Friday, 8 May, 2009, 2:08 AM
>        =20
>         Hi all
>        =20
>         I got the period down to 6 seconds at the lower end, but at 4 sec=
onds
>         the high end. But I have to do it adjust the period really slowly=
.. I am
>         not sure what I can detect at 6 seconds.
>        =20
>         Geoffrey, I know what you mean. I am trying to understand somethi=
ng in a
>         diffrent language and am trying to understand something that I ha=
ve not
>         got a big traning on.
>        =20
>         Regards.
>         J=F3n Fr=EDmann.
>        =20
>         On fim, 2009-05-07 at 17:04 -0700, Geoffrey wrote:
>         > Gee, I believe this to be one of those
>         > garden gate seismometers.
>         > I always thought of it as a modified
>         > pendulum changing the acceleration of gravity
>         > in a trigonometric fashion.
>         > This means the mass is the lowest point on the lever arm
>         > or you can not have stability.
>         > It manipulates the pull of gravity
>         > like Sine or Cosine of the angle relative
>         > to horizontal.
>         > I believe you guys are thinking much more
>         > complex then myself.
>         > You more than likely will never
>         > take souls like me very serious.
>         > Sort of like Rodney Dangerfield ???
>         >=20
>         > ----- Original Message -----=20
>         > From: "J=F3n Fr=EDmann" <jonfr@.........>
>         > To: "PSN-Postlist" <PSN-L@..............>
>         > Sent: Wednesday, May 06, 2009 7:54 PM
>         > Subject: Incresing the period of a lehmans seismomter ?
>         >=20
>         >=20
>         > Hi all
>         >=20
>         > Tomorrow I am going to make the final changes to my lehman seis=
momter. I
>         > hope that this changes make the seismomter get down to 20 secon=
ds period
>         > at most.
>         >=20
>         > The only thing that I need to know is this. What is the best wa=
y to
>         > increase the period of my lehman seismomter ? Moving the boom d=
own or
>         > up ? Or do I have to do something else.
>         >=20
>         > Regards.
>        =20
>         __________________________________________________________
>        =20
>         Public Seismic Network Mailing List (PSN-L)
>        =20
>         To leave this list email PSN-L-REQUEST@.............. with
>         the body of the message (first line only): unsubscribe
>         See http://www.seismicnet.com/maillist.html for more information.


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Incresing the period of a lehmans seismomter ?
From: Mark Robinson  mark.robinson@............... 
Date: Sun, 10 May 2009 11:59:06 +1200

Jón Frímann wrote:
> Hi all
> 
> Thanks for the help of the weeks. I could not have fixed the issues with
> out you all.
> 
> I am still having minor issues adjusting the period of my lehman sensor.
> I am not sure if I have to move the boom up or down to increase the
> period of my sensor.
> 
> Regards.
> Jón Frímann.

Hi Jón,

It's not a matter of moving the boom up or down but of moving the axis closer 
to vertical. The axis being the line through the two bearing points.

You are faced with the tradeoff of period versus stability

Looking at the pictures of your seismograph I see a few things I'd work on.

I'd like to see some triangulation between the vertical and horizontal parts of 
the frame. Rigidity of the frame is critical for stability.

The turnbuckle looks a bit rough. Some dabs of weld on the hooked joins should 
improve stability. I'd probably replace the whole arrangement with a single 
piece of (at least partially threaded) rod.

All the best
Mark
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Incresing the period of a lehmans seismomter ?
From: shammon1@.............
Date: Sat, 9 May 2009 17:36:10 -0700 (GMT-07:00)

Try using a bubble level to know when the boom is level. Then tilt the end =
of the boom down, never up. I normally start by using a level to make sure =
the vertical upright is at zero degrees and then I level the boom. I then a=
dd about 1-5 degree of tile in the  upper most point of the upright in the =
direction of the boom. I have three level screws the base plate and a machi=
ne screw in the end of the boom to make the adjustment.=20
Regards, Stve Hammond PSN San Jose Aptos, CA

-----Original Message-----
>From: J=C3=B3n Fr=C3=ADmann <jonfr@.........>
>Sent: May 9, 2009 4:28 PM
>To: psn-l@..............
>Subject: Re: Incresing the period of a lehmans seismomter ?
>
>Hi all
>
>Thanks for the help of the weeks. I could not have fixed the issues with
>out you all.
>
>I am still having minor issues adjusting the period of my lehman sensor.
>I am not sure if I have to move the boom up or down to increase the
>period of my sensor.
>
>Regards.
>J=C3=B3n Fr=C3=ADmann.
>
>On f=C3=B6s, 2009-05-08 at 05:41 +0000, JAMES RIDOUT wrote:
>> Jon,
>>       I found it very confusing when setting the period for my
>> seismograph, and for a=20
>> long time took the period to be the time it takes the arm to swing
>> from one side to the
>> other.( I could never get much more than 10 seconds)!!.
>>  But apparently I am wrong, The period is the time it takes for the
>> arm to swing
>> past the same point in the same direction twice. So if you hold the
>> arm towards you
>>  and let it go, as it passes the centre, start a stopwatch, then
>> let the arm go to the other side,
>> then back towards you , and as it passes the centre again press stop.
>> This is the period.
>>   Anyone please correct me if I am wrong. !!.
>>                                                                 James
>>=20
>> --- On Fri, 8/5/09, J=C3=B3n Fr=C3=ADmann <jonfr@.........> wrote:
>>=20
>>         From: J=C3=B3n Fr=C3=ADmann <jonfr@.........>
>>         Subject: Re: Incresing the period of a lehmans seismomter ?
>>         To: psn-l@..............
>>         Date: Friday, 8 May, 2009, 2:08 AM
>>        =20
>>         Hi all
>>        =20
>>         I got the period down to 6 seconds at the lower end, but at 4 se=
conds
>>         the high end. But I have to do it adjust the period really slowl=
y. I am
>>         not sure what I can detect at 6 seconds.
>>        =20
>>         Geoffrey, I know what you mean. I am trying to understand someth=
ing in a
>>         diffrent language and am trying to understand something that I h=
ave not
>>         got a big traning on.
>>        =20
>>         Regards.
>>         J=C3=B3n Fr=C3=ADmann.
>>        =20
>>         On fim, 2009-05-07 at 17:04 -0700, Geoffrey wrote:
>>         > Gee, I believe this to be one of those
>>         > garden gate seismometers.
>>         > I always thought of it as a modified
>>         > pendulum changing the acceleration of gravity
>>         > in a trigonometric fashion.
>>         > This means the mass is the lowest point on the lever arm
>>         > or you can not have stability.
>>         > It manipulates the pull of gravity
>>         > like Sine or Cosine of the angle relative
>>         > to horizontal.
>>         > I believe you guys are thinking much more
>>         > complex then myself.
>>         > You more than likely will never
>>         > take souls like me very serious.
>>         > Sort of like Rodney Dangerfield ???
>>         >=20
>>         > ----- Original Message -----=20
>>         > From: "J=C3=B3n Fr=C3=ADmann" <jonfr@.........>
>>         > To: "PSN-Postlist" <PSN-L@..............>
>>         > Sent: Wednesday, May 06, 2009 7:54 PM
>>         > Subject: Incresing the period of a lehmans seismomter ?
>>         >=20
>>         >=20
>>         > Hi all
>>         >=20
>>         > Tomorrow I am going to make the final changes to my lehman sei=
smomter. I
>>         > hope that this changes make the seismomter get down to 20 seco=
nds period
>>         > at most.
>>         >=20
>>         > The only thing that I need to know is this. What is the best w=
ay to
>>         > increase the period of my lehman seismomter ? Moving the boom =
down or
>>         > up ? Or do I have to do something else.
>>         >=20
>>         > Regards.
>>        =20
>>         __________________________________________________________
>>        =20
>>         Public Seismic Network Mailing List (PSN-L)
>>        =20
>>         To leave this list email PSN-L-REQUEST@.............. with
>>         the body of the message (first line only): unsubscribe
>>         See http://www.seismicnet.com/maillist.html for more information=
.
>
>
>__________________________________________________________
>
>Public Seismic Network Mailing List (PSN-L)
>
>To leave this list email PSN-L-REQUEST@.............. with
>the body of the message (first line only): unsubscribe
>See http://www.seismicnet.com/maillist.html for more information.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Incresing the period of a lehmans seismomter ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sun, 10 May 2009 02:15:42 +0000

Hi

I will try to get a bubble level tomorrow. I can't get it at this hour.
With the current setup I can get a good signal at 15 seconds with the
software filtering, the main signal is at 0.1Hz (5 seconds). What can I
expect to detect at that period with my lehman seismomter ?

Here are pictures of the final setup. I have made some changes since I
last put pictures on the web.

http://www.jonfr.com/myndir/v/geology/lehman/p5100001.jpg.html (First
picture)

Regards.
J=F3n Fr=EDmann.

On lau, 2009-05-09 at 17:36 -0700, shammon1@............. wrote:
> Try using a bubble level to know when the boom is level. Then tilt the en=
d of the boom down, never up. I normally start by using a level to make sur=
e the vertical upright is at zero degrees and then I level the boom. I then=
 add about 1-5 degree of tile in the  upper most point of the upright in th=
e direction of the boom. I have three level screws the base plate and a mac=
hine screw in the end of the boom to make the adjustment.=20
> Regards, Stve Hammond PSN San Jose Aptos, CA
>=20
> -----Original Message-----
> >From: J=F3n Fr=EDmann <jonfr@.........>
> >Sent: May 9, 2009 4:28 PM
> >To: psn-l@..............
> >Subject: Re: Incresing the period of a lehmans seismomter ?
> >
> >Hi all
> >
> >Thanks for the help of the weeks. I could not have fixed the issues with
> >out you all.
> >
> >I am still having minor issues adjusting the period of my lehman sensor.
> >I am not sure if I have to move the boom up or down to increase the
> >period of my sensor.
> >
> >Regards.
> >J=F3n Fr=EDmann.
> >
> >On f=F6s, 2009-05-08 at 05:41 +0000, JAMES RIDOUT wrote:
> >> Jon,
> >>       I found it very confusing when setting the period for my
> >> seismograph, and for a=20
> >> long time took the period to be the time it takes the arm to swing
> >> from one side to the
> >> other.( I could never get much more than 10 seconds)!!.
> >>  But apparently I am wrong, The period is the time it takes for the
> >> arm to swing
> >> past the same point in the same direction twice. So if you hold the
> >> arm towards you
> >>  and let it go, as it passes the centre, start a stopwatch, then
> >> let the arm go to the other side,
> >> then back towards you , and as it passes the centre again press stop.
> >> This is the period.
> >>   Anyone please correct me if I am wrong. !!.
> >>                                                                 James
> >>=20
> >> --- On Fri, 8/5/09, J=F3n Fr=EDmann <jonfr@.........> wrote:
> >>=20
> >>         From: J=F3n Fr=EDmann <jonfr@.........>
> >>         Subject: Re: Incresing the period of a lehmans seismomter ?
> >>         To: psn-l@..............
> >>         Date: Friday, 8 May, 2009, 2:08 AM
> >>        =20
> >>         Hi all
> >>        =20
> >>         I got the period down to 6 seconds at the lower end, but at 4 =
seconds
> >>         the high end. But I have to do it adjust the period really slo=
wly. I am
> >>         not sure what I can detect at 6 seconds.
> >>        =20
> >>         Geoffrey, I know what you mean. I am trying to understand some=
thing in a
> >>         diffrent language and am trying to understand something that I=
 have not
> >>         got a big traning on.
> >>        =20
> >>         Regards.
> >>         J=F3n Fr=EDmann.
> >>        =20
> >>         On fim, 2009-05-07 at 17:04 -0700, Geoffrey wrote:
> >>         > Gee, I believe this to be one of those
> >>         > garden gate seismometers.
> >>         > I always thought of it as a modified
> >>         > pendulum changing the acceleration of gravity
> >>         > in a trigonometric fashion.
> >>         > This means the mass is the lowest point on the lever arm
> >>         > or you can not have stability.
> >>         > It manipulates the pull of gravity
> >>         > like Sine or Cosine of the angle relative
> >>         > to horizontal.
> >>         > I believe you guys are thinking much more
> >>         > complex then myself.
> >>         > You more than likely will never
> >>         > take souls like me very serious.
> >>         > Sort of like Rodney Dangerfield ???
> >>         >=20
> >>         > ----- Original Message -----=20
> >>         > From: "J=F3n Fr=EDmann" <jonfr@.........>
> >>         > To: "PSN-Postlist" <PSN-L@..............>
> >>         > Sent: Wednesday, May 06, 2009 7:54 PM
> >>         > Subject: Incresing the period of a lehmans seismomter ?
> >>         >=20
> >>         >=20
> >>         > Hi all
> >>         >=20
> >>         > Tomorrow I am going to make the final changes to my lehman s=
eismomter. I
> >>         > hope that this changes make the seismomter get down to 20 se=
conds period
> >>         > at most.
> >>         >=20
> >>         > The only thing that I need to know is this. What is the best=
 way to
> >>         > increase the period of my lehman seismomter ? Moving the boo=
m down or
> >>         > up ? Or do I have to do something else.
> >>         >=20
> >>         > Regards.
> >>        =20
> >>         __________________________________________________________
> >>        =20
> >>         Public Seismic Network Mailing List (PSN-L)
> >>        =20
> >>         To leave this list email PSN-L-REQUEST@.............. with
> >>         the body of the message (first line only): unsubscribe
> >>         See http://www.seismicnet.com/maillist.html for more informati=
on.
> >
> >
> >__________________________________________________________
> >
> >Public Seismic Network Mailing List (PSN-L)
> >
> >To leave this list email PSN-L-REQUEST@.............. with
> >the body of the message (first line only): unsubscribe
> >See http://www.seismicnet.com/maillist.html for more information.
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Incresing the period of a lehmans seismomter ?
From: ChrisAtUpw@.......
Date: Sat, 9 May 2009 23:44:13 EDT

 
In a message dated 10/05/2009, shammon1@............. writes:

Try  using a bubble level to know when the boom is level. Then tilt the end 
of the  boom down, never up. I normally start by using a level to make sure 
the  vertical upright is at zero degrees and then I level the boom. I then 
add  about 1-5 degree of tilt in the upper most point of the upright in the  
direction of the boom. I have three level screws the base plate and a 
machine  screw in the end of the boom to make the adjustment. 
Regards, Stve Hammond  


Hi Steve,
 
    The period is not effected by the angle of the boom  itself. It is the 
angle between the local vertical and the line joining the two  centres of 
rotation which is critical for determining the period.
 
    In 
_http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototype.jpg_ 
(http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototype.jpg)  this  line joins the centre of the 1/2" ball bearing on the upright 
with  the fine wire at the top where it is clamped by the edges of the brass  
variable rotating clamp washers. The horizontal arm is set up parallel to 
the  base bar just for convenience.
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 10/05/2009, shammon1@............. writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>Try 
  using a bubble level to know when the boom is level. Then tilt the end=
 of the 
  boom down, never up. I normally start by using a level to make sure the=
 
  vertical upright is at zero degrees and then I level the boom. I then ad=
d 
  about 1-5 degree of tilt in the&nbsp;upper most point of the upright in=
 the 
  direction of the boom. I have three level screws the base plate and a ma=
chine 
  screw in the end of the boom to make the adjustment. <BR>Regards, Stve=
 Hammond 
  </FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Steve,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The period is not effected by the angle of th=
e boom 
itself. It is the angle between the local vertical and the line joining th=
e two 
centres of rotation which is critical for determining the period.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;In&nbsp;<A 
href=3D"http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototy=
pe.jpg">http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototy=
pe.jpg</A>&nbsp;this 
line joins the centre of the 1/2"&nbsp;ball bearing on the upright with 
the&nbsp;fine wire at the top where it is clamped by the&nbsp;edges of the=
 brass 
variable rotating clamp washers. The horizontal arm is set up parallel to=
 the 
base bar just for convenience.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: RE: Incresing the period of a lehmans seismomter ?
From: "Steve Hammond"  shammon1@............. 
Date: Sun, 10 May 2009 00:58:50 -0700

Hi Chris, I agree 100% and I think that's exactly what I said below. I'll
try to state it clearer. Make sure the vertical upright is at zero degree
and then adjust the boom so that it is level. Next add 1-5 degree of tile in
the upper most point of the upright (not the boom). This will change centre
of the line between the two joins. Did anybody ever mention that by changing
the centre line in the uprights the boom will actually lower at the mass end
and the boom needs to be leveled again? Regards, Steve

 

From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of ChrisAtUpw@.......
Sent: Saturday, May 09, 2009 8:44 PM
To: psn-l@..............
Subject: Re: Incresing the period of a lehmans seismomter ?

 

In a message dated 10/05/2009, shammon1@............. writes:

Try using a bubble level to know when the boom is level. Then tilt the end
of the boom down, never up. I normally start by using a level to make sure
the vertical upright is at zero degrees and then I level the boom. I then
add about 1-5 degree of tilt in the upper most point of the upright in the
direction of the boom. I have three level screws the base plate and a
machine screw in the end of the boom to make the adjustment. 
Regards, Stve Hammond 

Hi Steve,

 

    The period is not effected by the angle of the boom itself. It is the
angle between the local vertical and the line joining the two centres of
rotation which is critical for determining the period.

 

    In
http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototype.jpg
this line joins the centre of the 1/2" ball bearing on the upright with the
fine wire at the top where it is clamped by the edges of the brass variable
rotating clamp washers. The horizontal arm is set up parallel to the base
bar just for convenience.

 

    Regards,

 

    Chris Chapman

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<div class=3DSection1>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Hi Chris, I agree 100% and I think that&#8217;s exactly =
what I
said below. I&#8217;ll try to state it clearer. Make sure the vertical =
upright
is at zero degree and then adjust the boom so that it is level. Next add =
1-5
degree of tile in the upper most point of the upright (not the boom). =
This will
change centre of the line between the two joins. Did anybody ever =
mention that
by changing the centre line in the uprights the boom will actually lower =
at the
mass end and the boom needs to be leveled again? Regards, =
Steve<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div>

<div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in'>

<p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
psn-l-request@.............. [mailto:psn-l-request@............... <b>On =
Behalf
Of </b>ChrisAtUpw@.......<br>
<b>Sent:</b> Saturday, May 09, 2009 8:44 PM<br>
<b>To:</b> psn-l@..............<br>
<b>Subject:</b> Re: Incresing the period of a lehmans seismomter =
?<o:p></o:p></span></p>

</div>

</div>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>In a message dated 10/05/2009, shammon1@............. =
writes:<o:p></o:p></span></p>

</div>

<blockquote style=3D'border:none;border-left:solid blue =
1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Try using a bubble level to know when the boom is level. =
Then tilt
the end of the boom down, never up. I normally start by using a level to =
make
sure the vertical upright is at zero degrees and then I level the boom. =
I then
add about 1-5 degree of tilt in the&nbsp;upper most point of the upright =
in the
direction of the boom. I have three level screws the base plate and a =
machine
screw in the end of the boom to make the adjustment. <br>
Regards, Stve Hammond <o:p></o:p></span></p>

</blockquote>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Hi Steve,<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;The period is not effected by the =
angle of
the boom itself. It is the angle between the local vertical and the line
joining the two centres of rotation which is critical for determining =
the
period.<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;In&nbsp;<a
href=3D"http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_protot=
ype.jpg">http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_proto=
type.jpg</a>&nbsp;this
line joins the centre of the 1/2&quot;&nbsp;ball bearing on the upright =
with
the&nbsp;fine wire at the top where it is clamped by the&nbsp;edges of =
the
brass variable rotating clamp washers. The horizontal arm is set up =
parallel to
the base bar just for convenience.<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;Regards,<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman<o:p></o:p></span></p>

</div>

</div>

</body>

</html>

Subject: Anti-Alize Filter Design Program
From: "Geoffrey"  gmvoeth@........... 
Date: Mon, 11 May 2009 17:47:01 -0700

Hello PSN folks;
I just put together a program to
help me design an active anti alize
Low Pass filter N=8 for whatever values
you might want to use. It is based upon
the filters and formulas located
in the ARRL handbook ( many generations
of that book). I will be glad to send it to
any PSN people as an attachment to Email
maybe 500KB attachment as a self extracting
RAR file with an EXE extension. I will not
password protect it if it is emailed directly to you.
I have modified the basic formulas to suit this
program and I believe it works quite nicely.
It seems to run on Win XP and Vista both 32 and 64 bit
as a 32 bit program. Send me your request and
I will email it to you no more questions asked.
Just use it for yourselves and do not try to
sell it to anyone for profit. I am not a pro
but just an amateur like yourselves.
TaTa;
geoff at GVA
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Pivots  Re: Incresing the period of a lehmans seismomter ?
From: "Robert O. Green"  rog@.......... 
Date: Tue, 12 May 2009 20:13:11 -0700

Chris,

Do you have any close up pictures of your upper and lower pivots?

Rob


ChrisAtUpw@....... wrote:
> In a message dated 10/05/2009, shammon1@............. writes:
>
>     Try using a bubble level to know when the boom is level. Then tilt
>     the end of the boom down, never up. I normally start by using a
>     level to make sure the vertical upright is at zero degrees and
>     then I level the boom. I then add about 1-5 degree of tilt in
>     the upper most point of the upright in the direction of the boom.
>     I have three level screws the base plate and a machine screw in
>     the end of the boom to make the adjustment.
>     Regards, Stve Hammond 
>
> Hi Steve,
>     The period is not effected by the angle of the boom itself. It is 
> the angle between the local vertical and the line joining the two 
> centres of rotation which is critical for determining the period.
>     In 
> http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototype.jpg this 
> line joins the centre of the 1/2" ball bearing on the upright with 
> the fine wire at the top where it is clamped by the edges of the brass 
> variable rotating clamp washers. The horizontal arm is set up parallel 
> to the base bar just for convenience.
>     Regards,
>     Chris Chapman
> ------------------------------------------------------------------------
>
>
> Internal Virus Database is out of date.
> Checked by AVG - http://www.avg.com
> Version: 8.0.176 / Virus Database: 270.12.3/2075 - Release Date: 4/22/2009 5:25 PM
>
>   


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Anti-Alize Filter Design Program
From: Robert McClure  bobmcclure90@......... 
Date: Wed, 13 May 2009 16:44:59 -0400

On  Mon, 11 May 2009, Geoffrey wrote:
I just put together a program to help me design an active anti alize
Low Pass filter N=8 for whatever values you might want to use.

Hi Geoff,

  What is an anti alize filter? Do you mean anti-alias? Is this a
program for analog filter design? What do you mean by "active"?

Bob
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Anti-Alize Filter Design Program
From: "Geoffrey"  gmvoeth@........... 
Date: Wed, 13 May 2009 15:58:19 -0700


----- Original Message ----- 
From: "Robert McClure" <bobmcclure90@.........>
To: "psn-l" <psn-l@..............>
Sent: Wednesday, May 13, 2009 1:44 PM
Subject: Re: Anti-Alize Filter Design Program


> On  Mon, 11 May 2009, Geoffrey wrote:
> I just put together a program to help me design an active anti alize
> Low Pass filter N=8 for whatever values you might want to use.
> 
> Hi Geoff,
> 
>  What is an anti alize filter? Do you mean anti-alias?

Yes, I have seen it spelled both ways.
Where the Americans tend to use Zs
I have seen the brits use Ss
Since Im USA I like to use Zs :-)
Like they say colour when we say color.
And they drive on the wrong side of the road too.
But I must say they are better at technology today
than we are, The american public seems to me hateful of industry in general in favor of farming over industry.
Since i like it the other way around im at odds with
my own peoples. They want anyone working in electronics
today to have a min of 4 years after high school.
This was not true when I was young.
Technology is becoming a class of snobs in the USA today.
This filter goes just before the Buffer amps on the output
feeding the A/D converter but only if the amplifier you are
using does not already have one (lpf). It keeps like in my case
60Hz from looking like 5.3 or 5.4 or something like that.
And also it helps keep out man made artifacts like vehicular
activity which is terrible at my location.


 Is this a
> program for analog filter design? What do you mean by "active"?


Active uses amplifiers in this case OpAmp of your choice.
Passive are like R and C without any amplifiers.
C alone is a reactive component as is L.
I have been taught old school Electronics
like condensor instead of capacitor so my terms
might not be up to date.

> 
> Bob
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
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Subject: Re: Pivots  Re: Increasing the period of a Lehman seismometer ?
From: ChrisAtUpw@.......
Date: Wed, 13 May 2009 19:44:10 EDT

 
In a message dated 13/05/2009, rog@.......... writes:

Chris,
Do you have any close up pictures of your upper and lower  pivots?
Rob



Hi Rob,
 
    Sorry, but I don't have any other photos. 
 
    
_http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototype.jpg_ 
(http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototype.jpg) 
 
    The bottom bearing is a 1/2" OD SS ball bearing  crimped in a 1/2" hole 
drilled into the upright bar. The arm is 1/2" HT30  Aluminum alloy, turned 
flat on the end. A rectangular SS faceplate about  10mm x 8mm and 16 thou 
thick is stuck onto this using 2 component acrylic  adhesive Holdtite ST3295. 
The faceplate was cut from a Swann Morton medical  scalpel blade using a 1" 
carbide disk. Other brands of 2 component acrylic  adhesive are available. 
Unlike the brittle epoxies, acrylic adhesives are  slightly flexible, very 
tough and stick the softer metals quite well.
    
    The top suspension is a short 8 thou OD nickel  plated piano wire 
clamped between two bronze disks with an eccentric centre  hole. The inside faces 
of these disks are both recessed about 15 thou so that  only the outside 
1.5mm rings grip the wire. The wire is threaded through a  hole in the centre 
bolt. Both eccentric disks can be rotated to vary the  position of the wire 
clamp.
 
    Behind the disks is the 'wire wind on' SS bolt for  trimming the 
position of the arm. It is held in position by friction at the base  using a 
spring washer and a SS nut. The wire wraps into the bolt thread, so  that the 
wind-on position is constant. The bolt is drilled near the  top. The wire is 
threaded through this hole and is clamped by the top  nut. I used a taper 
reamer to put a small flat on the tip of the first  thread in this nut, so that 
the wire is clamped between this flat and the V of  the bolt thread. To trim 
the position of the mass, you slack off the bolt  clamping the bronze 
washers and adjust the 'wind on' bolt. Then you clamp the  bronze washers again.
 
    The V suspension is 30lb 7 core SS fishing trace  with crimped end 
loops fitting in V section rings on the 1/2"  OD extension rods bolted to the 
square mounting plate. The top  fitting is a 1" and a 1.5" OD SS mudguard 
washers stuck together with  acrylic adhesive. The 1.5" disk has a V section 
edge to hold the trace  wire. I turned this groove, but you can use a 
triangular needle file. The  washer is 1/16" thick. The 4 mm SS wire clamp bolt is 
suitably drilled, the wire  is threaded through and clamped between two flat 
SS washers. This V  suspension prevents the mass from rotating about it's 
long axis due to any off  centre forces from the damping blade.
 
    The mass should be prevented from rotating /  oscillating around the 
long axis of the arm. This motion may not be damped on  amateur seismometers 
and can give rise to serious resonances at a few Hz,  particularly with 
single wire top suspensions. Unless the axis of the damping  force intersects the 
perpendicular from the centre of mass to the swing axis,  any earth motion 
will try to rotate the mass as well as deflecting it from side  to side. 
This null is difficult to achieve in practice. You can use a V wire or  a twin 
tube suspension. You can also design the magnetic damping to control  both 
rotational and translational motions of the mass - in two directions at  
right angles. 
    
 
You need to make the arm and the mass from non  magnetic materials. Never 
mount a magnet on the arm. Never use a ball  rolling on a plane - they slip 
too easily. Choose the position of the top  support so that the bottom 
'bearing' has an almost zero vertical  loading.
    Designing out problems / unwanted responses is  something of an art!

 
    I hope that this helps?
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 13/05/2009, rog@.......... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 
  size=3D2>Chris,<BR>Do you have any close up pictures of your upper and=
 lower 
  pivots?<BR>Rob<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Rob,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Sorry, but I don't have any other photos. </D=
IV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;<A 
href=3D"http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototy=
pe.jpg">http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototy=
pe.jpg</A></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The bottom bearing is a 1/2" OD SS ball beari=
ng 
crimped in a 1/2" hole drilled into the upright bar. The arm is 1/2" HT30=
 
Aluminum alloy, turned flat on the end.&nbsp;A rectangular SS faceplate ab=
out 
10mm x 8mm and&nbsp;16 thou thick is stuck onto this using 2 component acr=
ylic 
adhesive Holdtite ST3295. The faceplate was cut from a Swann Morton medica=
l 
scalpel blade using a 1" carbide disk. Other brands of 2 component acrylic=
 
adhesive are available. Unlike the brittle epoxies, acrylic adhesives are=
 
slightly flexible, very tough and stick the softer metals quite well.</DIV=
>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The top suspension is a short&nbsp;8 thou OD=
 nickel 
plated piano wire clamped between two bronze disks with an eccentric centr=
e 
hole. The inside faces of these disks are both recessed about 15 thou so=
 that 
only the outside 1.5mm rings grip the wire. The wire is threaded through=
 a 
hole&nbsp;in the centre bolt. Both eccentric disks can be rotated to vary=
 the 
position of the wire clamp.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Behind the disks is the 'wire wind on' SS bol=
t for 
trimming the position of the arm. It is held in position by friction at th=
e base 
using a spring washer and a SS nut. The wire&nbsp;wraps into the bolt thre=
ad, so 
that the wind-on position is constant. The&nbsp;bolt is drilled near the=
 
top.&nbsp;The wire is threaded through this hole and is clamped by the top=
 
nut.&nbsp;I&nbsp;used a taper reamer to put a small flat on the tip of the=
 first 
thread in this nut, so that the wire is clamped between this flat and the=
 V of 
the bolt thread.&nbsp;To trim the position of the mass, you slack off the=
 bolt 
clamping the bronze washers and adjust the 'wind on' bolt. Then you clamp=
 the 
bronze washers again.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The V suspension is 30lb 7 core SS fishing tr=
ace 
with crimped end loops fitting&nbsp;in&nbsp;V section rings on the&nbsp;1/=
2" 
OD&nbsp;extension rods bolted to the square mounting plate.&nbsp;The top=
 
fitting&nbsp;is a 1" and a 1.5" OD SS mudguard washers stuck together with=
 
acrylic adhesive. The 1.5" disk has a&nbsp;V section edge to hold the trac=
e 
wire. I turned this groove, but you can use a triangular needle file.&nbsp=
;The 
washer is 1/16" thick. The 4 mm SS wire clamp bolt is suitably drilled, th=
e wire 
is threaded through&nbsp;and clamped between two flat SS&nbsp;washers. Thi=
s V 
suspension prevents the mass from rotating about it's long axis due to any=
 off 
centre forces from the damping blade.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The mass should be prevented from rotating /=
 
oscillating around the long axis of the arm. This motion may not be damped=
 on 
amateur seismometers and can give rise to serious resonances at a few Hz,=
 
particularly with single wire top suspensions. Unless the axis of the damp=
ing 
force intersects the perpendicular from the centre of mass to the swing ax=
is, 
any earth motion will try to rotate the mass as well as deflecting it from=
 side 
to side. This null is difficult to achieve in practice. You can use a V wi=
re or 
a twin tube suspension. You can also design the&nbsp;magnetic damping to=
 control 
both rotational and translational motions of the mass - in two directions=
 at 
right angles. </DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;</DIV>
<DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You need to make the arm and the mass from no=
n 
magnetic&nbsp;materials. Never mount a magnet on the arm. Never use a ball=
 
rolling on a plane - they slip too easily. Choose the position of the top=
 
support so that the bottom 'bearing'&nbsp;has an almost zero vertical 
loading.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Designing out problems / unwanted responses=
 is 
something of an art!</DIV></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I hope that this helps?</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Unreported earthquake?
From: "tchannel"  tchannel@............ 
Date: Wed, 13 May 2009 18:54:28 -0600

Hailey, Idaho  =
http://mbmgquake.mtech.edu/earthworm/wavef_disp/HLID_SPZ_US.2009051300.gi=
f

Missoula, Montana  =
http://mbmgquake.mtech.edu/earthworm/wavef_disp/MSO_SPZ_US.2009051300.gif=


Very confused..???.

I received a signature on all three sensors, Hailey Idaho and Montana =
received it also....The only event posted was a 5.7m Tonga, but the P =
arrive one minute too late for this to match.

Did anyone get this one?

My signal also look too short for that distance,  This appears to be =
much closer than Tonga @5400 miles.   Perhaps Idaho, Utah???   Sometime =
the USGS is slow to report Local events.

   My clock is correct.

Thanks,


Ted
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>
<DIV><FONT size=3D2 face=3DArial>Hailey, Idaho&nbsp; <A=20
href=3D"">http://mbmgquake.mtech.edu/earthworm/wavef_disp/HLID_SPZ_US.200=
9051300.gif</A></FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Missoula, Montana&nbsp; <A=20
href=3D"">http://mbmgquake.mtech.edu/earthworm/wavef_disp/MSO_SPZ_US.2009=
051300.gif</A></FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Very confused..???.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>I received a signature on all three =
sensors, Hailey=20
Idaho and Montana received it also....The only event posted was a 5.7m =
Tonga,=20
but the P arrive one minute too late for this to match.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Did anyone get this one?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>My signal also look too short for that=20
distance,&nbsp; This appears to be much closer than Tonga @5400=20
miles.&nbsp;&nbsp; Perhaps Idaho, Utah???&nbsp;&nbsp; Sometime the USGS =
is slow=20
to report Local events.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>&nbsp;&nbsp; My clock is =
correct.</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>Thanks,</DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 =
face=3DArial>Ted</FONT></DIV></FONT></DIV></BODY></HTML>

Subject: Re: Unreported earthquake?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Thu, 14 May 2009 02:05:04 +0000

Hi

The earthquake appears to be closer to the Idaho station. I would guess
something around 100 to 250 km away from it, might even be closer. This
looks like a local event with the magnitude of ML 3.5 - 4.2, or
something in that range.

But this is just guess based on the data that I see on the plots.

Regards.
J=F3n Fr=EDmann.

On mi=F0, 2009-05-13 at 18:54 -0600, tchannel wrote:
> Hailey, Idaho
> http://mbmgquake.mtech.edu/earthworm/wavef_disp/HLID_SPZ_US.2009051300.gi=
f
> =20
> Missoula, Montana
> http://mbmgquake.mtech.edu/earthworm/wavef_disp/MSO_SPZ_US.2009051300.gif
> =20
> Very confused..???.
> =20
> I received a signature on all three sensors, Hailey Idaho and Montana
> received it also....The only event posted was a 5.7m Tonga, but the P
> arrive one minute too late for this to match.
> =20
> Did anyone get this one?
> =20
> My signal also look too short for that distance,  This appears to be
> much closer than Tonga @5400 miles.   Perhaps Idaho, Utah???
> Sometime the USGS is slow to report Local events.
> =20
>    My clock is correct.
> =20
> Thanks,
> =20
> =20
> Ted

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Pivots  Re: Increasing the period of a Lehman seismometer ?
From: "Robert O. Green"  rog@.......... 
Date: Wed, 13 May 2009 20:34:32 -0700

Chris,

Thank you.  This does help.  You are very kind for sharing your 
expertise and experience.

I will be trying to follow in you foot steps for my Lehman.

Rob


ChrisAtUpw@....... wrote:
> In a message dated 13/05/2009, rog@.......... writes:
>
>     Chris,
>     Do you have any close up pictures of your upper and lower pivots?
>     Rob
>
> Hi Rob,
>     Sorry, but I don't have any other photos.
> http://jclahr.com/science/psn/chapman/2008%20lehman/lehman_prototype.jpg
>     The bottom bearing is a 1/2" OD SS ball bearing crimped in a 1/2" 
> hole drilled into the upright bar. The arm is 1/2" HT30 Aluminum 
> alloy, turned flat on the end. A rectangular SS faceplate about 10mm x 
> 8mm and 16 thou thick is stuck onto this using 2 component acrylic 
> adhesive Holdtite ST3295. The faceplate was cut from a Swann Morton 
> medical scalpel blade using a 1" carbide disk. Other brands of 2 
> component acrylic adhesive are available. Unlike the brittle epoxies, 
> acrylic adhesives are slightly flexible, very tough and stick the 
> softer metals quite well.
>     The top suspension is a short 8 thou OD nickel plated piano wire 
> clamped between two bronze disks with an eccentric centre hole. The 
> inside faces of these disks are both recessed about 15 thou so that 
> only the outside 1.5mm rings grip the wire. The wire is threaded 
> through a hole in the centre bolt. Both eccentric disks can be rotated 
> to vary the position of the wire clamp.
>     Behind the disks is the 'wire wind on' SS bolt for trimming the 
> position of the arm. It is held in position by friction at the base 
> using a spring washer and a SS nut. The wire wraps into the bolt 
> thread, so that the wind-on position is constant. The bolt is drilled 
> near the top. The wire is threaded through this hole and is clamped by 
> the top nut. I used a taper reamer to put a small flat on the tip of 
> the first thread in this nut, so that the wire is clamped between this 
> flat and the V of the bolt thread. To trim the position of the mass, 
> you slack off the bolt clamping the bronze washers and adjust the 
> 'wind on' bolt. Then you clamp the bronze washers again.
>     The V suspension is 30lb 7 core SS fishing trace with crimped end 
> loops fitting in V section rings on the 1/2" OD extension rods bolted 
> to the square mounting plate. The top fitting is a 1" and a 1.5" OD SS 
> mudguard washers stuck together with acrylic adhesive. The 1.5" disk 
> has a V section edge to hold the trace wire. I turned this groove, but 
> you can use a triangular needle file. The washer is 1/16" thick. The 4 
> mm SS wire clamp bolt is suitably drilled, the wire is threaded 
> through and clamped between two flat SS washers. This V suspension 
> prevents the mass from rotating about it's long axis due to any off 
> centre forces from the damping blade.
>     The mass should be prevented from rotating / oscillating around 
> the long axis of the arm. This motion may not be damped on amateur 
> seismometers and can give rise to serious resonances at a few Hz, 
> particularly with single wire top suspensions. Unless the axis of the 
> damping force intersects the perpendicular from the centre of mass to 
> the swing axis, any earth motion will try to rotate the mass as well 
> as deflecting it from side to side. This null is difficult to achieve 
> in practice. You can use a V wire or a twin tube suspension. You can 
> also design the magnetic damping to control both rotational and 
> translational motions of the mass - in two directions at right angles.
>     You need to make the arm and the mass from non magnetic materials. 
> Never mount a magnet on the arm. Never use a ball rolling on a plane - 
> they slip too easily. Choose the position of the top support so that 
> the bottom 'bearing' has an almost zero vertical loading.
>     Designing out problems / unwanted responses is something of an art!
>     I hope that this helps?
>     Regards,
>     Chris Chapman
> ------------------------------------------------------------------------
>
>
> Internal Virus Database is out of date.
> Checked by AVG - http://www.avg.com
> Version: 8.0.176 / Virus Database: 270.12.3/2075 - Release Date: 4/22/2009 5:25 PM
>
>   

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Unreported earthquake?
From: Bob Hancock  icarus@......... 
Date: Wed, 13 May 2009 22:00:34 -0700

Ted -

This appears to be a local event nearer to HLID than MSO.  Was the  
signal strong enough on all three channels that you got a clear  
indication of the P wave first movement.  If so, have you plotted the  
incoming ray path to your station.

Bob Hancock


On May 13, 2009, at 5:54 PM, tchannel wrote:

> Hailey, Idaho  http://mbmgquake.mtech.edu/earthworm/wavef_disp/HLID_SPZ_US.2009051300.gif
>
> Missoula, Montana  http://mbmgquake.mtech.edu/earthworm/wavef_disp/MSO_SPZ_US.2009051300.gif
>
> Very confused..???.
>
> I received a signature on all three sensors, Hailey Idaho and  
> Montana received it also....The only event posted was a 5.7m Tonga,  
> but the P arrive one minute too late for this to match.
>
> Did anyone get this one?
>
> My signal also look too short for that distance,  This appears to be  
> much closer than Tonga @5400 miles.   Perhaps Idaho, Utah???    
> Sometime the USGS is slow to report Local events.
>
>    My clock is correct.
>
> Thanks,
>
>
> Ted

<html><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; "><div><div>Ted =
-</div><div><br></div><div>This appears to be a local event nearer to =
HLID than MSO. &nbsp;Was the signal strong enough on all three channels =
that you got a clear indication of the P wave first movement. &nbsp;If =
so, have you plotted the incoming&nbsp;ray path&nbsp;to your =
station.</div><div><br></div><div>Bob =
Hancock</div><div><br></div><div><br></div><div>On May 13, 2009, at 5:54 =
PM, tchannel wrote:</div><br =
class=3D"Apple-interchange-newline"><blockquote type=3D"cite"><span =
class=3D"Apple-style-span" style=3D"border-collapse: separate; color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: =
normal; font-variant: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; orphans: 2; text-align: auto; text-indent: =
0px; text-transform: none; white-space: normal; widows: 2; word-spacing: =
0px; -webkit-border-horizontal-spacing: 0px; =
-webkit-border-vertical-spacing: 0px; =
-webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: =
auto; -webkit-text-stroke-width: 0; "><div bgcolor=3D"#ffffff"><div><font =
size=3D"2" face=3D"Arial"><div><font size=3D"2" face=3D"Arial">Hailey, =
Idaho&nbsp;<span class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"">http://mbmgquake.mtech.edu/earthworm/wavef_disp/HLID_SPZ_US.2009=
051300.gif</a></font></div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial">Missoula, Montana&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"">http://mbmgquake.mtech.edu/earthworm/wavef_disp/MSO_SPZ_US.20090=
51300.gif</a></font></div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial">Very confused..???.</font></div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" face=3D"Arial">I =
received a signature on all three sensors, Hailey Idaho and Montana =
received it also....The only event posted was a 5.7m Tonga, but the P =
arrive one minute too late for this to match.</font></div><div><font =
size=3D"2" face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial">Did anyone get this one?</font></div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" face=3D"Arial">My =
signal also look too short for that distance,&nbsp; This appears to be =
much closer than Tonga @5400 miles.&nbsp;&nbsp; Perhaps Idaho, =
Utah???&nbsp;&nbsp; Sometime the USGS is slow to report Local =
events.</font></div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial">&nbsp;&nbsp; My clock is =
correct.</font></div><div>&nbsp;</div><div>Thanks,</div><div><font =
size=3D"2" face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial">Ted</font></div></font></div></div></span></blockquote></di=
v><br></body></html>=

Subject: WWSSN
From: Antonio Moura  geopresp@......... 
Date: Thu, 14 May 2009 09:39:53 +0100

Hello

Anyone here know if any of the old 60's sensors, Long or short
period, existing at the *World-Wide Standard Seismographic Network (WWSSN) *can
be adapted to work today with new data acquisition systems? They were
Benioff sensors with variable reluctance for the short-period instruments
and Ewing Press sensors for the long period.

Regards

Rui
<div>Hello</div>
<div>=A0</div>
<div>Anyone here know if any of the old 60&#39;s sensors, Long or short per=
iod,=A0existing at the <strong>World-Wide Standard Seismographic Network (W=
WSSN) </strong>can be adapted to work today with new data acquisition syste=
ms? They were Benioff sensors with variable reluctance for the short-period=
 instruments and Ewing Press sensors for the long period.</div>

<div>=A0</div>
<div>Regards</div>
<div>=A0</div>
<div>Rui=A0</div>

Subject: Re: Unreported earthquake?
From: "tchannel"  tchannel@............ 
Date: Thu, 14 May 2009 06:45:57 -0600

Hi Bob,  Why didn't I think of that?   Do you know where I can get these =
two .psn files?
Thanks, Ted
  ----- Original Message -----=20
  From: Bob Hancock=20
  To: psn-l@.................
  Sent: Wednesday, May 13, 2009 11:00 PM
  Subject: Re: Unreported earthquake?


  Ted -


  This appears to be a local event nearer to HLID than MSO.  Was the =
signal strong enough on all three channels that you got a clear =
indication of the P wave first movement.  If so, have you plotted the =
incoming ray path to your station.


  Bob Hancock




  On May 13, 2009, at 5:54 PM, tchannel wrote:


    Hailey, Idaho  =
http://mbmgquake.mtech.edu/earthworm/wavef_disp/HLID_SPZ_US.2009051300.gi=
f

    Missoula, Montana  =
http://mbmgquake.mtech.edu/earthworm/wavef_disp/MSO_SPZ_US.2009051300.gif=


    Very confused..???.

    I received a signature on all three sensors, Hailey Idaho and =
Montana received it also....The only event posted was a 5.7m Tonga, but =
the P arrive one minute too late for this to match.

    Did anyone get this one?

    My signal also look too short for that distance,  This appears to be =
much closer than Tonga @5400 miles.   Perhaps Idaho, Utah???   Sometime =
the USGS is slow to report Local events.

       My clock is correct.

    Thanks,


    Ted

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY=20
style=3D"WORD-WRAP: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space"=20
bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>Hi Bob,&nbsp; Why didn't I think of=20
that?&nbsp;&nbsp; Do you know where I can get these two .psn =
files?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Thanks, Ted</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
  <A title=3Dicarus@......... href=3D"mailto:icarus@.........">Bob =
Hancock</A>=20
</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Wednesday, May 13, 2009 =
11:00=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: Unreported =
earthquake?</DIV>
  <DIV><BR></DIV>
  <DIV>
  <DIV>Ted -</DIV>
  <DIV><BR></DIV>
  <DIV>This appears to be a local event nearer to HLID than MSO. =
&nbsp;Was the=20
  signal strong enough on all three channels that you got a clear =
indication of=20
  the P wave first movement. &nbsp;If so, have you plotted the =
incoming&nbsp;ray=20
  path&nbsp;to your station.</DIV>
  <DIV><BR></DIV>
  <DIV>Bob Hancock</DIV>
  <DIV><BR></DIV>
  <DIV><BR></DIV>
  <DIV>On May 13, 2009, at 5:54 PM, tchannel wrote:</DIV><BR=20
  class=3DApple-interchange-newline>
  <BLOCKQUOTE type=3D"cite"><SPAN=20
    style=3D"WIDOWS: 2; TEXT-TRANSFORM: none; TEXT-INDENT: 0px; =
BORDER-COLLAPSE: separate; FONT: 14px Helvetica; WHITE-SPACE: normal; =
ORPHANS: 2; LETTER-SPACING: normal; COLOR: rgb(0,0,0); WORD-SPACING: =
0px; -webkit-border-horizontal-spacing: 0px; =
-webkit-border-vertical-spacing: 0px; =
-webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: =
auto; -webkit-text-stroke-width: 0"=20
    class=3DApple-style-span>
    <DIV bgcolor=3D"#ffffff">
    <DIV><FONT size=3D2 face=3DArial>
    <DIV><FONT size=3D2 face=3DArial>Hailey, Idaho&nbsp;<SPAN=20
    class=3DApple-converted-space>&nbsp;</SPAN><A=20
    =
href=3D"">http://mbmgquake.mtech.edu/earthworm/wavef_disp/HLID_SPZ_US.200=
9051300.gif</A></FONT></DIV>
    <DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2 face=3DArial>Missoula, Montana&nbsp;<SPAN=20
    class=3DApple-converted-space>&nbsp;</SPAN><A=20
    =
href=3D"">http://mbmgquake.mtech.edu/earthworm/wavef_disp/MSO_SPZ_US.2009=
051300.gif</A></FONT></DIV>
    <DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2 face=3DArial>Very confused..???.</FONT></DIV>
    <DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2 face=3DArial>I received a signature on all three =
sensors,=20
    Hailey Idaho and Montana received it also....The only event posted =
was a=20
    5.7m Tonga, but the P arrive one minute too late for this to=20
    match.</FONT></DIV>
    <DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2 face=3DArial>Did anyone get this =
one?</FONT></DIV>
    <DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2 face=3DArial>My signal also look too short for =
that=20
    distance,&nbsp; This appears to be much closer than Tonga @5400=20
    miles.&nbsp;&nbsp; Perhaps Idaho, Utah???&nbsp;&nbsp; Sometime the =
USGS is=20
    slow to report Local events.</FONT></DIV>
    <DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2 face=3DArial>&nbsp;&nbsp; My clock is =
correct.</FONT></DIV>
    <DIV>&nbsp;</DIV>
    <DIV>Thanks,</DIV>
    <DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
    <DIV><FONT size=3D2=20
  =
face=3DArial>Ted</FONT></DIV></FONT></DIV></DIV></SPAN></BLOCKQUOTE></DIV=
><BR></BLOCKQUOTE></BODY></HTML>

Subject: Re: Unreported earthquake?
From: Bob Hancock  icarus@......... 
Date: Thu, 14 May 2009 06:24:05 -0700

Hi Ted -

There is more than one way to do this - the easiest would be to look  
at your data and compute the incoming ray path.  If you have good P &  
S waves, you could also get a rough distance from your station.   
Another way would be to download the SAC files from HLID and MSO using  
the VASE program, which is available through IRIS.  You can then  
convert them to PSN format through WiNQUAKE, or leave them in SAC  
format.  Note that WINQUAKE can read a data set in PSN format, but not  
in SAC format.  With P & S wave data from all three stations, you  
could draw the arcs and see where they crossover.  That would be more  
accurate.

Since the event was visible at both HLID an MSO, I would not be  
surprised if the records are updated sometime today.

Bob Hancock


On May 14, 2009, at 5:45 AM, tchannel wrote:

> Hi Bob,  Why didn't I think of that?   Do you know where I can get  
> these two .psn files?
> Thanks, Ted
> ----- Original Message -----
> From: Bob Hancock
> To: psn-l@..............
> Sent: Wednesday, May 13, 2009 11:00 PM
> Subject: Re: Unreported earthquake?
>
> Ted -
>
> This appears to be a local event nearer to HLID than MSO.  Was the  
> signal strong enough on all three channels that you got a clear  
> indication of the P wave first movement.  If so, have you plotted  
> the incoming ray path to your station.
>
> Bob Hancock
>
>
> On May 13, 2009, at 5:54 PM, tchannel wrote:
>
>> Hailey, Idaho  http://mbmgquake.mtech.edu/earthworm/wavef_disp/HLID_SPZ_US.2009051300.gif
>>
>> Missoula, Montana  http://mbmgquake.mtech.edu/earthworm/wavef_disp/MSO_SPZ_US.2009051300.gif
>>
>> Very confused..???.
>>
>> I received a signature on all three sensors, Hailey Idaho and  
>> Montana received it also....The only event posted was a 5.7m Tonga,  
>> but the P arrive one minute too late for this to match.
>>
>> Did anyone get this one?
>>
>> My signal also look too short for that distance,  This appears to  
>> be much closer than Tonga @5400 miles.   Perhaps Idaho, Utah???    
>> Sometime the USGS is slow to report Local events.
>>
>>    My clock is correct.
>>
>> Thanks,
>>
>>
>> Ted
>
>

<html><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; "><div>Hi Ted =
-</div><div><br></div><div>There is more than one way to do this - the =
easiest would be to look at your data and compute the incoming ray path. =
&nbsp;If you have good P &amp; S waves, you could also get a rough =
distance from your station. &nbsp;Another way would be to download the =
SAC files from HLID and MSO using the VASE program, which is available =
through IRIS. &nbsp;You can then convert them to PSN format through =
WiNQUAKE, or leave them in SAC format. &nbsp;Note that WINQUAKE =
can&nbsp;read&nbsp;a&nbsp;data set&nbsp;in PSN format, but not in SAC =
format. &nbsp;With P &amp; S wave data from all three stations, you =
could draw the arcs and see where they crossover. &nbsp;That would be =
more accurate. &nbsp;</div><div><br></div><div>Since the event was =
visible at both HLID an MSO, I would not be surprised if the records are =
updated sometime today.</div><div><br></div><div>Bob =
Hancock</div><div><br></div><br><div><div>On May 14, 2009, at 5:45 AM, =
tchannel wrote:</div><br class=3D"Apple-interchange-newline"><blockquote =
type=3D"cite"><span class=3D"Apple-style-span" style=3D"border-collapse: =
separate; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant: normal; font-weight: normal; =
letter-spacing: normal; line-height: normal; orphans: 2; text-align: =
auto; text-indent: 0px; text-transform: none; white-space: normal; =
widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; =
-webkit-border-vertical-spacing: 0px; =
-webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: =
auto; -webkit-text-stroke-width: 0; "><div bgcolor=3D"#ffffff" =
style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; "><div><font size=3D"2" =
face=3D"Arial">Hi Bob,&nbsp; Why didn't I think of that?&nbsp;&nbsp; Do =
you know where I can get these two .psn files?</font></div><div><font =
size=3D"2" face=3D"Arial">Thanks, Ted</font></div><blockquote =
style=3D"border-left-color: rgb(0, 0, 0); border-left-width: 2px; =
border-left-style: solid; padding-left: 5px; padding-right: 0px; =
margin-left: 5px; margin-right: 0px; "><div style=3D"font: normal normal =
normal 10pt/normal arial; ">----- Original Message -----</div><div =
style=3D"font: normal normal normal 10pt/normal arial; background-image: =
initial; background-repeat: initial; background-attachment: initial; =
-webkit-background-clip: initial; -webkit-background-origin: initial; =
background-color: rgb(228, 228, 228); background-position: initial =
initial; "><b>From:</b><span =
class=3D"Apple-converted-space">&nbsp;</span><a title=3D"icarus@........."=
 href=3D"mailto:icarus@.........">Bob Hancock</a></div><div style=3D"font:=
 normal normal normal 10pt/normal arial; "><b>To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span><a =
title=3D"psn-l@.............." =
href=3D"mailto:psn-l@..............">psn-l@..............</a></div><div =
style=3D"font: normal normal normal 10pt/normal arial; =
"><b>Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Wednesday, May 13, 2009 =
11:00 PM</div><div style=3D"font: normal normal normal 10pt/normal =
arial; "><b>Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Re: Unreported =
earthquake?</div><div><br></div><div><div>Ted =
-</div><div><br></div><div>This appears to be a local event nearer to =
HLID than MSO. &nbsp;Was the signal strong enough on all three channels =
that you got a clear indication of the P wave first movement. &nbsp;If =
so, have you plotted the incoming&nbsp;ray path&nbsp;to your =
station.</div><div><br></div><div>Bob =
Hancock</div><div><br></div><div><br></div><div>On May 13, 2009, at 5:54 =
PM, tchannel wrote:</div><br =
class=3D"Apple-interchange-newline"><blockquote type=3D"cite"><span =
class=3D"Apple-style-span" style=3D"widows: 2; text-transform: none; =
text-indent: 0px; border-collapse: separate; font: normal normal normal =
14px/normal Helvetica; white-space: normal; orphans: 2; letter-spacing: =
normal; color: rgb(0, 0, 0); word-spacing: 0px; =
-webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: =
0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: =
auto; -webkit-text-stroke-width: 0px; "><div =
bgcolor=3D"#ffffff"><div><font size=3D"2" face=3D"Arial"><div><font =
size=3D"2" face=3D"Arial">Hailey, Idaho&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"">http://mbmgquake.mtech.edu/earthworm/wavef_disp/HLID_SPZ_US.2009=
051300.gif</a></font></div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial">Missoula, Montana&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"">http://mbmgquake.mtech.edu/earthworm/wavef_disp/MSO_SPZ_US.20090=
51300.gif</a></font></div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial">Very confused..???.</font></div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" face=3D"Arial">I =
received a signature on all three sensors, Hailey Idaho and Montana =
received it also....The only event posted was a 5.7m Tonga, but the P =
arrive one minute too late for this to match.</font></div><div><font =
size=3D"2" face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial">Did anyone get this one?</font></div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" face=3D"Arial">My =
signal also look too short for that distance,&nbsp; This appears to be =
much closer than Tonga @5400 miles.&nbsp;&nbsp; Perhaps Idaho, =
Utah???&nbsp;&nbsp; Sometime the USGS is slow to report Local =
events.</font></div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial">&nbsp;&nbsp; My clock is =
correct.</font></div><div>&nbsp;</div><div>Thanks,</div><div><font =
size=3D"2" face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial"></font>&nbsp;</div><div><font size=3D"2" =
face=3D"Arial">Ted</font></div></font></div></div></span></blockquote></di=
v><br></blockquote></div></span><br =
class=3D"Apple-interchange-newline"></blockquote></div><br></body></html>=

Subject: Re: WWSSN
From: ChrisAtUpw@.......
Date: Thu, 14 May 2009 19:31:38 EDT

 
In a message dated 14/05/2009, geopresp@......... writes:

Anyone here know if any of the old 60's sensors, Long or short  period, 
existing at the World-Wide Standard Seismographic Network  (WWSSN) can be 
adapted to work today with new data acquisition  systems? They were Benioff 
sensors with variable reluctance for the  short-period instruments and Ewing 
Press sensors for the long period.
Regards
Rui 



Hi Rui,
 
    Several Sprengnethers, both V and H, have been  adapted successfully. 
If you add a capacitative position sensor, you  may use the original sensor 
coils + magnets for feedback to get an  excellent broadband response. New 
amplifiers and ADCs should not be a  problem.
    Randall Peters has modified some Sprengnethers. See  
_http://physics.mercer.edu/hpage/peters.html_ (http://physics.mercer.edu/hpage/peters.html) 
    I do not know enough about the larger Benioff  machines, but if the 
springs and suspensions are OK, I can see no reason in  principle why not. You 
might need to look carefully before buying one. They are  likely to have 
been out of use and not maintained for more than 25  years. Some of them used 
photographic recording using light reflected from  sensitive galvanometers to 
give gain with an 'optical lever'. These galvos had  delicate suspension 
systems, so you may need a replacement sensor. Incidentally,  you can get 
resolutions down to <15 nano metres using pairs of large  area silicon 
photocells, a simple moving shutter, a lens and a  tungsten filament bulb, but the 
operating range is restricted by the size of the  photocells and any drift in 
the instrument. You may be able to remove drift  problems with a long period 
integrator and force feedback, while retaining  the original response. 
    I remember some mini Lehmans being  offered on psn about 5 years ago. 
Seismic sensors occasionally  appear on Ebay, but I have not seen anything 
there that I would want to  own, due to very poor condition / parts missing / 
huge prices being demanded for  what appeared to be scrap. Older type 
seismometers tend to be both large and  very heavy = costly to transport. The USGS 
disposed of several of their early  borehole electronic triaxial KS-36000 
units some years back. Check with psn  archives? 
    For a Press-Ewing photo see 
_http://sismordia.blogspot.com/2008/08/sunday-seismometer-10.html_ (http://sismor
dia.blogspot.com/2008/08/sunday-seismometer-10.html) 
    
_http://www.blogcatalog.com/blogs/sismordia-seismology-at-concordia/posts/tag/sunday+seismometer/_ 
(http://www.blogcatalog.com/blogs/sismordia-seismology-at-concordia/posts/tag/sunday+seismometer/) 
    Some very early seismometers used mechanical levers  to amplify the 
ground motion and weighed up to several tons. Later seismometers  used a magnet 
+ coil to drive a sensitive galvanometer fitted with a mirror. A  beam of 
light was reflected from the mirror and focussed onto  photographic film / 
paper, so you had to chemically develop the image  before you could read it. 
You could probably replace the photographic film  with a pair of differential 
silicon photocells. The WWSSN network started  in ~1959, peaked in the 
1970s with about 115 stations world wide and was  replaced after 1983. They used 
paper recordings. 
    I suspect that the answer to your question very  much depends on what 
you are capable of designing / repairing / making /  adapting. Broken / 
missing low Tc springs could be a problem to replace. They  were made specially 
for the particular seismometers. Rewinding coils definitely  requires skill, 
care, time, good eyesight and preferably a coil winding  machine. 
    Where are you based? Are you considering any  particular instrument 
types? 
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 14/05/2009, geopresp@......... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>
  <DIV>Anyone here know if any of the old 60's sensors, Long or short 
  period,&nbsp;existing at the <STRONG>World-Wide Standard Seismographic=
 Network 
  (WWSSN) </STRONG>can be adapted to work today with new data acquisition=
 
  systems? They were Benioff sensors with variable reluctance for the 
  short-period instruments and Ewing Press sensors for the long period.</D=
IV>
  <DIV>Regards</DIV>
  <DIV>Rui&nbsp;</DIV></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Rui,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Several Sprengnethers, both V and H,&nbsp;hav=
e been 
adapted successfully. If you add a capacitative position sensor, you 
may&nbsp;use the original sensor coils + magnets for feedback to get an 
excellent&nbsp;broadband response. New amplifiers and ADCs&nbsp;should not=
 be a 
problem.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Randall Peters has modified some Sprengnether=
s. See 
&nbsp;<A 
href=3D"http://physics.mercer.edu/hpage/peters.html">http://physics.mercer=
..edu/hpage/peters.html</A></DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I do&nbsp;not know enough about the larger Be=
nioff 
machines, but if the springs and suspensions are OK, I can see no reason=
 in 
principle why not. You might need to look carefully before buying one. The=
y are 
likely to have been out of use and not maintained for more than 25 
years.&nbsp;Some of them used photographic recording using light reflected=
 from 
sensitive galvanometers to give gain with an 'optical lever'. These galvos=
 had 
delicate suspension systems, so you may need a replacement sensor. Inciden=
tally, 
you can get resolutions down to &lt;15 nano metres using pairs of&nbsp;lar=
ge 
area silicon photocells, a&nbsp;simple moving shutter, a lens&nbsp;and a=
 
tungsten filament bulb, but the operating range is restricted by the size=
 of the 
photocells and any drift in the instrument. You may&nbsp;be able to remove=
 drift 
problems with&nbsp;a long period integrator and force feedback, while reta=
ining 
the original response.&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I remember some mini&nbsp;Lehmans being 
offered&nbsp;on&nbsp;psn about 5 years ago.&nbsp;Seismic sensors occasiona=
lly 
appear on Ebay, but I have not seen anything there&nbsp;that I would want=
 to 
own, due to very poor condition / parts missing / huge prices being demand=
ed for 
what appeared to be scrap. Older type seismometers tend to be both large=
 and 
very heavy =3D costly to transport. The USGS disposed of several of their=
 early 
borehole electronic triaxial KS-36000 units some years back. Check with ps=
n 
archives?&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;For a Press-Ewing photo see <A 
href=3D"http://sismordia.blogspot.com/2008/08/sunday-seismometer-10.html">=
http://sismordia.blogspot.com/2008/08/sunday-seismometer-10.html</A></DIV>
<DIV>&nbsp;&nbsp;&nbsp; <A 
href=3D"http://www.blogcatalog.com/blogs/sismordia-seismology-at-concordia=
/posts/tag/sunday+seismometer/">http://www.blogcatalog.com/blogs/sismordia=
-seismology-at-concordia/posts/tag/sunday+seismometer/</A></DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Some very early seismometers used mechanical=
 levers 
to amplify the ground motion and weighed up to several tons. Later seismom=
eters 
used a magnet + coil to drive a sensitive galvanometer fitted with a mirro=
r. A 
beam of light was reflected from the mirror and focussed onto 
photographic&nbsp;film / paper, so you had to chemically develop the image=
 
before you could read it. You could probably replace the photographic film=
 
with&nbsp;a pair of differential silicon photocells. The WWSSN network sta=
rted 
in ~1959, peaked in the 1970s with about 115 stations world wide and was=
 
replaced after 1983.&nbsp;They used paper recordings. </DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I suspect that the answer to your question ve=
ry 
much depends on what you are capable of designing / repairing / making /=
 
adapting. Broken / missing low Tc springs could be a problem to replace.=
 They 
were made specially for the particular seismometers. Rewinding coils defin=
itely 
requires skill, care, time, good eyesight&nbsp;and preferably a coil windi=
ng 
machine. </DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Where are you based? Are you considering any=
 
particular instrument types? </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Mystery Earthquake
From: "tchannel"  tchannel@............ 
Date: Fri, 15 May 2009 06:50:55 -0600

The USGS posted this event =
http://earthquake.usgs.gov/eqcenter/recenteqsus/Quakes/us2009gpb2.php It =
was a 3.1 North of Boise 88km.

Thanks to Bob and others for trying to help me identify it.   I wanted =
to try to pin point the epicenter on my own, but was off by about 100km. =
  I had a very difficult time trying to determine the S on any of the =
five sensors we are running locally.  There are many remote stations in =
Idaho, but most of them are not maintained.   Hailey Idaho was avail, =
and that helped. This is a good example why good design and quiet =
locations are so  important.    At our stations the P and S were only 10 =
seconds apart and the S not well defined at all.  All this made accuracy =
very difficult.

Thanks, again
Ted

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>The USGS posted this event <A=20
href=3D"http://earthquake.usgs.gov/eqcenter/recenteqsus/Quakes/us2009gpb2=
..php">http://earthquake.usgs.gov/eqcenter/recenteqsus/Quakes/us2009gpb2.p=
hp</A>&nbsp;It=20
was a 3.1 North of&nbsp;Boise 88km.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Thanks to Bob and others for trying to =
help me=20
identify it.&nbsp;&nbsp; I wanted to try to pin point the epicenter on =
my own,=20
but was off by about 100km.&nbsp;&nbsp; I had a very difficult time =
trying to=20
determine the S on any of the five sensors we are running=20
locally.&nbsp;&nbsp;There are many remote stations in Idaho, but most of =

them&nbsp;are not maintained.&nbsp;&nbsp; Hailey Idaho was avail, and =
that=20
helped.&nbsp;This is a good example why good design and quiet locations =
are=20
so&nbsp; important.&nbsp;&nbsp;&nbsp; At our stations the P and S were =
only 10=20
seconds apart and the S not well defined at all.&nbsp; All this made =
accuracy=20
very difficult.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Thanks, again</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Ted</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV></BODY></HTML>

Subject: Strong earthquake alert
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Fri, 15 May 2009 21:37:04 +0000

Hi all

I belive that there is a good chance of a strong earthquake near Kodiak
Island in Alaska soon. The current swarm in that area gives me the clues
I need to make that suggestion. When it might happen is unclear, but at
the speed the current swarm is developing, the earthquake might happen
in the next 24 to 72 at the earliest.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: RE: Strong earthquake alert
From: "Gary Lindgren"  gel@................. 
Date: Sat, 16 May 2009 14:23:44 -0700

Jon,
How did you do that? Several strong earthquakes today on Kodiak Island, =
just
as you predicted. Good predictions.
Gary
Palo Alto CA





-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Friday, May 15, 2009 2:37 PM
To: PSN-Postlist
Subject: Strong earthquake alert

Hi all

I belive that there is a good chance of a strong earthquake near Kodiak
Island in Alaska soon. The current swarm in that area gives me the clues
I need to make that suggestion. When it might happen is unclear, but at
the speed the current swarm is developing, the earthquake might happen
in the next 24 to 72 at the earliest.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: RE: Strong earthquake alert
From: "Kareem Lanier"  system98765@............. 
Date: Sat, 16 May 2009 14:45:52 -0700

Yeah, looks like at least three magnitude 5 quakes, including a M5.9. =
Very
interesting call. And another M5 event within the past hour there too.

So, it seemed like the swarm indicated it?  Another note was that the
largest event in the sequence was the deepest, about 70 km or so while =
the
others are roughly six miles to depth. Wonder if something larger could =
be
coming in that area?=20


-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of Gary Lindgren
Sent: Saturday, May 16, 2009 2:24 PM
To: psn-l@..............
Subject: RE: Strong earthquake alert

Jon,
How did you do that? Several strong earthquakes today on Kodiak Island, =
just
as you predicted. Good predictions.
Gary
Palo Alto CA





-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Friday, May 15, 2009 2:37 PM
To: PSN-Postlist
Subject: Strong earthquake alert

Hi all

I belive that there is a good chance of a strong earthquake near Kodiak
Island in Alaska soon. The current swarm in that area gives me the clues =
I
need to make that suggestion. When it might happen is unclear, but at =
the
speed the current swarm is developing, the earthquake might happen in =
the
next 24 to 72 at the earliest.

Regards.
--
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

http://www.seismicnet.com/maillist.html for more information.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

http://www.seismicnet.com/maillist.html for more information.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: RE: Strong earthquake alert
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sat, 16 May 2009 22:06:30 +0000

Hi

I am currently devloping a idea on how to prediect some earthquakes.
This started with a swarm events that incresed in numbers as the time
did pass. That was a good sign that a strong earthquake was going to
happen in the area soon.

As it currently stands now I am expecting more earthquakes in that area,
with the possiblity of one earthquake that is going to be Mw6.0 or
stronger. The time frame is currently 24 to 72 hours as it stands now.

My predections are far from being good (but are improving), but there is
also a chance that this swarm might end as fast as it did start. But
that is a lesser chance then the other option.

Regards.
J=F3n Fr=EDmann.

On lau, 2009-05-16 at 14:23 -0700, Gary Lindgren wrote:
> Jon,
> How did you do that? Several strong earthquakes today on Kodiak Island, j=
ust
> as you predicted. Good predictions.
> Gary
> Palo Alto CA
>=20
>=20
>=20
>=20
>=20
> -----Original Message-----
> From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
> Behalf Of J=F3n Fr=EDmann
> Sent: Friday, May 15, 2009 2:37 PM
> To: PSN-Postlist
> Subject: Strong earthquake alert
>=20
> Hi all
>=20
> I belive that there is a good chance of a strong earthquake near Kodiak
> Island in Alaska soon. The current swarm in that area gives me the clues
> I need to make that suggestion. When it might happen is unclear, but at
> the speed the current swarm is developing, the earthquake might happen
> in the next 24 to 72 at the earliest.
>=20
> Regards.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Earthquake Prediction
From: "Geoffrey"  gmvoeth@........... 
Date: Sun, 17 May 2009 11:53:37 -0700

Howdy PSN;

I understand you guys to be talking about EQ predictions.
From what I see it is a lot like the US Navy says about
accidents. There is a correlation between the number
of small accidents and large accidents ( saying they
are really accidents and not some kind of premeditated thing)

So you watch the number of small accidents or the frequency thereof
and when you see the sudden increase of small ones
then a big one is right around the corner if you do not
do something right away to reduce the small ones.

There seems to be a relationship between accidents
and Earthquakes, I'm not a mathematician in Statistical
things ( other things neither) but it seems it may be a kind of law of nature
the way both of these things are behaving.
Does anyone concur ??

geoff


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Earthquake Prediction
From: "tchannel"  tchannel@............ 
Date: Sun, 17 May 2009 17:40:40 -0600

Geoffrey,  You may have something there!    I also an not a mathematician, 
but one educated person told me that earthquakes are like a basket of 
sleeping puppies, when one moves it trigger a series of additional 
movements.   I have found this also to note worthy.

Ted



----- Original Message ----- 
From: "Geoffrey" <gmvoeth@...........>
To: "PSN-LIST" <psn-l@..............>
Sent: Sunday, May 17, 2009 12:53 PM
Subject: Earthquake Prediction


> Howdy PSN;
>
> I understand you guys to be talking about EQ predictions.
> From what I see it is a lot like the US Navy says about
> accidents. There is a correlation between the number
> of small accidents and large accidents ( saying they
> are really accidents and not some kind of premeditated thing)
>
> So you watch the number of small accidents or the frequency thereof
> and when you see the sudden increase of small ones
> then a big one is right around the corner if you do not
> do something right away to reduce the small ones.
>
> There seems to be a relationship between accidents
> and Earthquakes, I'm not a mathematician in Statistical
> things ( other things neither) but it seems it may be a kind of law of 
> nature
> the way both of these things are behaving.
> Does anyone concur ??
>
> geoff
>
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with the body of the 
> message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information. 

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Earthquake Prediction
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sun, 17 May 2009 23:58:07 +0000

Hi

I find the humor and the irony here unworty. Earthquake prediction is
real sience.

http://hraun.vedur.is/ja/prenlab/
http://hraun.vedur.is/ja/prenlab/stat1.html

More data can be found on the internet. Use google!

Regards.
J=F3n Fr=EDmann.

On sun, 2009-05-17 at 17:40 -0600, tchannel wrote:
> Geoffrey,  You may have something there!    I also an not a mathematician=
,=20
> but one educated person told me that earthquakes are like a basket of=20
> sleeping puppies, when one moves it trigger a series of additional=20
> movements.   I have found this also to note worthy.
>=20
> Ted
>=20
>=20
>=20
> ----- Original Message -----=20
> From: "Geoffrey" <gmvoeth@...........>
> To: "PSN-LIST" <psn-l@..............>
> Sent: Sunday, May 17, 2009 12:53 PM
> Subject: Earthquake Prediction
>=20
>=20
> > Howdy PSN;
> >
> > I understand you guys to be talking about EQ predictions.
> > From what I see it is a lot like the US Navy says about
> > accidents. There is a correlation between the number
> > of small accidents and large accidents ( saying they
> > are really accidents and not some kind of premeditated thing)
> >
> > So you watch the number of small accidents or the frequency thereof
> > and when you see the sudden increase of small ones
> > then a big one is right around the corner if you do not
> > do something right away to reduce the small ones.
> >
> > There seems to be a relationship between accidents
> > and Earthquakes, I'm not a mathematician in Statistical
> > things ( other things neither) but it seems it may be a kind of law of=20
> > nature
> > the way both of these things are behaving.
> > Does anyone concur ??
> >
> > geoff
> >
> >
> > __________________________________________________________
> >
> > Public Seismic Network Mailing List (PSN-L)
> >
> > To leave this list email PSN-L-REQUEST@.............. with the body of =
the=20
> > message (first line only): unsubscribe
> > See http://www.seismicnet.com/maillist.html for more information.=20
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: English Channel Events
From: "Marchal van Lare"  vanlare@............. 
Date: Tue, 19 May 2009 21:09:41 +0200

Hi all,

Remember the discussion a little while ago about the English Channel =
'swarm'; check out the video on youtube: =
http://www.youtube.com/watch?v=3DH33XlT9Oxlk

The video is made by someone aboard a Dutch minesweeper close to the =
Normandy coast (France). The video was shot on April 23rd ~17:40 UTC and =
the detonation was responsible for the event reported by the BGS: =
http://www.quakes.bgs.ac.uk/recent_events/20090423174150.3.html

Regards,

Marchal
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hi all,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Remember&nbsp;the discussion a little =
while ago=20
about the English Channel 'swarm'; check out the video on youtube: <A=20
href=3D"http://www.youtube.com/watch?v=3DH33XlT9Oxlk">http://www.youtube.=
com/watch?v=3DH33XlT9Oxlk</A></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>The video is made by someone aboard a =
Dutch=20
minesweeper close to the Normandy coast (France).&nbsp;The =
video&nbsp;was shot=20
on April 23rd&nbsp;~17:40 UTC and the detonation was responsible for the =
event=20
reported by the BGS: <A=20
href=3D"http://www.quakes.bgs.ac.uk/recent_events/20090423174150.3.html">=
http://www.quakes.bgs.ac.uk/recent_events/20090423174150.3.html</A></FONT=
></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Regards,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Marchal</FONT></DIV></BODY></HTML>

Subject: Re: English Channel Events
From: JAMES RIDOUT  jamesridout@.............. 
Date: Tue, 19 May 2009 19:15:58 +0000 (GMT)

Hi, Thats great!, What are they blowing up? WW2 Mines, or testing something=
?

--- On Tue, 19/5/09, Marchal van Lare <vanlare@.............> wrote:

From: Marchal van Lare <vanlare@.............>
Subject: English Channel Events
To: psn-l@..............
Date: Tuesday, 19 May, 2009, 8:09 PM





Hi all,
=A0
Remember=A0the discussion a little while ago about the English Channel 'swa=
rm'; check out the video on youtube: http://www.youtube.com/watch?v=3DH33Xl=
T9Oxlk
=A0
The video is made by someone aboard a Dutch minesweeper close to the Norman=
dy coast (France).=A0The video=A0was shot on April 23rd=A0~17:40 UTC and th=
e detonation was responsible for the event reported by the BGS: http://www.=
quakes.bgs.ac.uk/recent_events/20090423174150.3.html
=A0
Regards,
=A0
Marchal
<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;">Hi, Thats great!, What are they blowing up? W=
W2 Mines, or testing something?<BR><BR>--- On <B>Tue, 19/5/09, Marchal van =
Lare <I>&lt;vanlare@.............&gt;</I></B> wrote:<BR>
<BLOCKQUOTE style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(=
16,16,255) 2px solid">From: Marchal van Lare &lt;vanlare@.............&gt;<=
BR>Subject: English Channel Events<BR>To: psn-l@..............<BR>Date: Tue=
sday, 19 May, 2009, 8:09 PM<BR><BR>
<DIV id=3Dyiv1790344872>
<STYLE></STYLE>

<DIV><FONT face=3DArial size=3D2>Hi all,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Remember&nbsp;the discussion a little whil=
e ago about the English Channel 'swarm'; check out the video on youtube: <A=
 href=3D"http://www.youtube.com/watch?v=3DH33XlT9Oxlk" target=3D_blank rel=
=3Dnofollow>http://www.youtube.com/watch?v=3DH33XlT9Oxlk</A></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>The video is made by someone aboard a Dutc=
h minesweeper close to the Normandy coast (France).&nbsp;The video&nbsp;was=
 shot on April 23rd&nbsp;~17:40 UTC and the detonation was responsible for =
the event reported by the BGS: <A href=3D"http://www.quakes.bgs.ac.uk/recen=
t_events/20090423174150.3.html" target=3D_blank rel=3Dnofollow>http://www.q=
uakes.bgs.ac.uk/recent_events/20090423174150.3.html</A></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Regards,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Marchal</FONT></DIV></DIV></BLOCKQUOTE></t=
d></tr></table>

Subject: Re: English Channel Events
From: "Marchal van Lare"  vanlare@............. 
Date: Tue, 19 May 2009 21:34:02 +0200

Hi,=20

They are clearing a WWII German mine in that Youtube movie, the =
authorities think there are still 100.000 to 300.000 old mines on the =
seabeds in the Channel and the North Sea.

Before 2005, about 50 of those old mines were localised yearly. In 2005 =
a deadly accident occured with a Dutch fishingboat; since then about 50 =
a month (!) of those old sea mines are localized. This explains those =
swarms of events also; the detonations need to be carried out during =
quiet weather.

Regards, Marchal

----- Original Message -----=20
  From: JAMES RIDOUT=20
  To: psn-l@.................
  Sent: Tuesday, May 19, 2009 9:15 PM
  Subject: Re: English Channel Events


        Hi, Thats great!, What are they blowing up? WW2 Mines, or =
testing something?

        --- On Tue, 19/5/09, Marchal van Lare <vanlare@.............> =
wrote:

          From: Marchal van Lare <vanlare@.............>
          Subject: English Channel Events
          To: psn-l@..............
          Date: Tuesday, 19 May, 2009, 8:09 PM


          Hi all,

          Remember the discussion a little while ago about the English =
Channel 'swarm'; check out the video on youtube: =
http://www.youtube.com/watch?v=3DH33XlT9Oxlk

          The video is made by someone aboard a Dutch minesweeper close =
to the Normandy coast (France). The video was shot on April 23rd ~17:40 =
UTC and the detonation was responsible for the event reported by the =
BGS: http://www.quakes.bgs.ac.uk/recent_events/20090423174150.3.html

          Regards,

          Marchal=20
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hi, </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>They are clearing a WWII German mine in =
that=20
Youtube movie, the authorities think there are still 100.000 to 300.000 =
old=20
mines on the seabeds in the Channel and the North Sea.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Before 2005, about 50 of those old =
mines were=20
localised yearly. In 2005 a deadly accident occured with a Dutch =
fishingboat;=20
since then about 50 a month (!) of those old sea mines are localized. =
This=20
explains those swarms of events also; the detonations need to be carried =
out=20
during quiet weather.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Regards, Marchal</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Djamesridout@.................
  href=3D"mailto:jamesridout@..............">JAMES RIDOUT</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, May 19, 2009 =
9:15 PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: English Channel =
Events</DIV>
  <DIV><BR></DIV>
  <TABLE cellSpacing=3D0 cellPadding=3D0 border=3D0>
    <TBODY>
    <TR>
      <TD vAlign=3Dtop>Hi, Thats great!, What are they blowing up? WW2 =
Mines, or=20
        testing something?<BR><BR>--- On <B>Tue, 19/5/09, Marchal van =
Lare=20
        <I>&lt;<A=20
        =
href=3D"mailto:vanlare@.............">vanlare@.............</A>&gt;</I></=
B>=20
        wrote:<BR>
        <BLOCKQUOTE=20
        style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: =
rgb(16,16,255) 2px solid">From:=20
          Marchal van Lare &lt;<A=20
          =
href=3D"mailto:vanlare@.............">vanlare@.............</A>&gt;<BR>Su=
bject:=20
          English Channel Events<BR>To: <A=20
          =
href=3D"mailto:psn-l@..............">psn-l@..............</A><BR>Date:=20
          Tuesday, 19 May, 2009, 8:09 PM<BR><BR>
          <DIV id=3Dyiv1790344872>
          <STYLE></STYLE>

          <DIV><FONT face=3DArial size=3D2>Hi all,</FONT></DIV>
          <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
          <DIV><FONT face=3DArial size=3D2>Remember&nbsp;the discussion =
a little=20
          while ago about the English Channel 'swarm'; check out the =
video on=20
          youtube: <A =
href=3D"http://www.youtube.com/watch?v=3DH33XlT9Oxlk"=20
          target=3D_blank=20
          =
rel=3Dnofollow>http://www.youtube.com/watch?v=3DH33XlT9Oxlk</A></FONT></D=
IV>
          <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
          <DIV><FONT face=3DArial size=3D2>The video is made by someone =
aboard a=20
          Dutch minesweeper close to the Normandy coast =
(France).&nbsp;The=20
          video&nbsp;was shot on April 23rd&nbsp;~17:40 UTC and the =
detonation=20
          was responsible for the event reported by the BGS: <A=20
          =
href=3D"http://www.quakes.bgs.ac.uk/recent_events/20090423174150.3.html" =

          target=3D_blank=20
          =
rel=3Dnofollow>http://www.quakes.bgs.ac.uk/recent_events/20090423174150.3=
..html</A></FONT></DIV>
          <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
          <DIV><FONT face=3DArial size=3D2>Regards,</FONT></DIV>
          <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
          <DIV><FONT face=3DArial=20
    =
size=3D2>Marchal</FONT></DIV></DIV></BLOCKQUOTE></TD></TR></TBODY></TABLE=
></BLOCKQUOTE></BODY></HTML>

Subject: Re: English Channel Events
From: JAMES RIDOUT  jamesridout@.............. 
Date: Tue, 19 May 2009 20:18:36 +0000 (GMT)

Hi,=A0The depth of that event was 6.7km, Would that really have such an efe=
ct on the surface?

--- On Tue, 19/5/09, Marchal van Lare <vanlare@.............> wrote:

From: Marchal van Lare <vanlare@.............>
Subject: Re: English Channel Events
To: psn-l@..............
Date: Tuesday, 19 May, 2009, 8:34 PM



Hi,=20
=A0
They are clearing a WWII German mine in that Youtube movie, the authorities=
 think there are still 100.000 to 300.000 old mines on the seabeds in the C=
hannel and the North Sea.
=A0
Before 2005, about 50 of those old mines were localised yearly. In 2005 a d=
eadly accident occured with a Dutch fishingboat; since then about 50 a mont=
h (!) of those old sea mines are localized. This explains those swarms of e=
vents also; the detonations need to be carried out during quiet weather.
=A0
Regards, Marchal
=A0
----- Original Message -----=20

From: JAMES RIDOUT=20
To: psn-l@.................
Sent: Tuesday, May 19, 2009 9:15 PM
Subject: Re: English Channel Events





Hi, Thats great!, What are they blowing up? WW2 Mines, or testing something=
?

--- On Tue, 19/5/09, Marchal van Lare <vanlare@.............> wrote:

From: Marchal van Lare <vanlare@.............>
Subject: English Channel Events
To: psn-l@..............
Date: Tuesday, 19 May, 2009, 8:09 PM





Hi all,
=A0
Remember=A0the discussion a little while ago about the English Channel 'swa=
rm'; check out the video on youtube: http://www.youtube.com/watch?v=3DH33Xl=
T9Oxlk
=A0
The video is made by someone aboard a Dutch minesweeper close to the Norman=
dy coast (France).=A0The video=A0was shot on April 23rd=A0~17:40 UTC and th=
e detonation was responsible for the event reported by the BGS: http://www.=
quakes.bgs.ac.uk/recent_events/20090423174150.3.html
=A0
Regards,
=A0
Marchal
<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;">Hi,&nbsp;The depth of that event was 6.7km, W=
ould that really have such an efect on the surface?<BR><BR>--- On <B>Tue, 1=
9/5/09, Marchal van Lare <I>&lt;vanlare@.............&gt;</I></B> wrote:<BR=
>
<BLOCKQUOTE style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(=
16,16,255) 2px solid">From: Marchal van Lare &lt;vanlare@.............&gt;<=
BR>Subject: Re: English Channel Events<BR>To: psn-l@..............<BR>Date:=
 Tuesday, 19 May, 2009, 8:34 PM<BR><BR>
<DIV id=3Dyiv1528952572>
<DIV><FONT face=3DArial size=3D2>Hi, </FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>They are clearing a WWII German mine in th=
at Youtube movie, the authorities think there are still 100.000 to 300.000 =
old mines on the seabeds in the Channel and the North Sea.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Before 2005, about 50 of those old mines w=
ere localised yearly. In 2005 a deadly accident occured with a Dutch fishin=
gboat; since then about 50 a month (!) of those old sea mines are localized=
.. This explains those swarms of events also; the detonations need to be car=
ried out during quiet weather.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Regards, Marchal</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5p=
x; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial"><B>From:</B> <A title=
=3Djamesridout@.............. href=3D"mailto:jamesridout@.............." ta=
rget=3D_blank rel=3Dnofollow>JAMES RIDOUT</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A title=3Dpsn-l@.............. =
href=3D"mailto:psn-l@.............." target=3D_blank rel=3Dnofollow>psn-l@w=
ebtronics.com</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, May 19, 2009 9:15 PM<=
/DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: English Channel Events<=
/DIV>
<DIV><BR></DIV>
<TABLE cellSpacing=3D0 cellPadding=3D0 border=3D0>
<TBODY>
<TR>
<TD vAlign=3Dtop>Hi, Thats great!, What are they blowing up? WW2 Mines, or =
testing something?<BR><BR>--- On <B>Tue, 19/5/09, Marchal van Lare <I>&lt;<=
A href=3D"mailto:vanlare@............." target=3D_blank rel=3Dnofollow>vanl=
are@.............</A>&gt;</I></B> wrote:<BR>
<BLOCKQUOTE style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(=
16,16,255) 2px solid">From: Marchal van Lare &lt;<A href=3D"mailto:vanlare@=
zeelandnet.nl" target=3D_blank rel=3Dnofollow>vanlare@.............</A>&gt;=
<BR>Subject: English Channel Events<BR>To: <A href=3D"mailto:psn-l@webtroni=
cs.com" target=3D_blank rel=3Dnofollow>psn-l@..............</A><BR>Date: Tu=
esday, 19 May, 2009, 8:09 PM<BR><BR>
<DIV id=3Dyiv1790344872>
<STYLE></STYLE>

<DIV><FONT face=3DArial size=3D2>Hi all,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Remember&nbsp;the discussion a little whil=
e ago about the English Channel 'swarm'; check out the video on youtube: <A=
 href=3D"http://www.youtube.com/watch?v=3DH33XlT9Oxlk" target=3D_blank rel=
=3Dnofollow>http://www.youtube.com/watch?v=3DH33XlT9Oxlk</A></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>The video is made by someone aboard a Dutc=
h minesweeper close to the Normandy coast (France).&nbsp;The video&nbsp;was=
 shot on April 23rd&nbsp;~17:40 UTC and the detonation was responsible for =
the event reported by the BGS: <A href=3D"http://www.quakes.bgs.ac.uk/recen=
t_events/20090423174150.3.html" target=3D_blank rel=3Dnofollow>http://www.q=
uakes.bgs.ac.uk/recent_events/20090423174150.3.html</A></FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Regards,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Marchal</FONT></DIV></DIV></BLOCKQUOTE></T=
D></TR></TBODY></TABLE></BLOCKQUOTE></DIV></BLOCKQUOTE></td></tr></table>

Subject: Re: Earthquake Prediction
From: "Geoffrey"  gmvoeth@........... 
Date: Tue, 19 May 2009 17:53:51 -0700

Hello PSN (humans as individual cells):
A thought about Normative Geology:
Accidents are probably more important
than Earthquakes since accidents
can be murder centric and not simply
a perceived act of some kind of god.
I have this personal belief that the
DPS's here in America are using safety
as a weapon and not to save/help people.
They are like the Feds CIA but on
a state level and their expertise will
rival any geophysics major.
America is not an individual oriented country
but an alien creature made up of human souls
as its individual cells, and the quicker the rest of
the world realizes this the better off they will be.
Earthquakes are only important to our country in the
social sense and never to the government on the individual level.
As a foreign member of PSN you most probably do not
understand the creature (USA) you are dealing with.
Since, America likes to paint an erroneous picture
of us to the rest of the world.
As a scientist keep an open mind or
you will be blinded by that alien creature
that makes gangs and groups and countries.
A true scientist is a danger to himself
since he in fact does keep an open mind.
The animal human will take undue advantage
of a true scientist (A minority on this Earth
But hopefully its future).
And this is all from a life long citizen of the USA
Who has served with at least three honorable discharges
from the US Navy (every DD214 I have ever received).
What I am saying here is that there may be a natural correlation that applies to both areas of science
(Of Which Math is a part) The trouble with your predictions
like with others is that there may be no warning signs
whatsoever prior to a major event. I have this belief
rooted in science that says nature made man and so
what ever is made by man is actually made by nature.
This is not any kind of religious belief but only
a logical observation. This life is most serious to me
since it is the ONLY one I shall ever have as geoff.
I don't play with your sense of reality any more than you play with mine. Please (On My HANDS AND KNEES BEGGING) Keep an open mind 
ignore those subjective thoughts. Life with science
is a never ending series of arguments without any violence
between people. The more like a (logically)good, objective, machine; the better the science. The disciplines are overlapping and 
there
are commonalities to be shared between them.
geoff


----- Original Message ----- 
From: "Jón Frímann" <jonfr@.........>
To: <psn-l@..............>
Sent: Sunday, May 17, 2009 4:58 PM
Subject: Re: Earthquake Prediction


Hi

I find the humor and the irony here unworty. Earthquake prediction is
real sience.

http://hraun.vedur.is/ja/prenlab/
http://hraun.vedur.is/ja/prenlab/stat1.html

More data can be found on the internet. Use google!

Regards.
Jón Frímann.

On sun, 2009-05-17 at 17:40 -0600, tchannel wrote:
> Geoffrey,  You may have something there!    I also an not a mathematician,
> but one educated person told me that earthquakes are like a basket of
> sleeping puppies, when one moves it trigger a series of additional
> movements.   I have found this also to note worthy.
>
> Ted
>
>
>
> ----- Original Message ----- 
> From: "Geoffrey" <gmvoeth@...........>
> To: "PSN-LIST" <psn-l@..............>
> Sent: Sunday, May 17, 2009 12:53 PM
> Subject: Earthquake Prediction
>
>
> > Howdy PSN;
> >
> > I understand you guys to be talking about EQ predictions.
> > From what I see it is a lot like the US Navy says about
> > accidents. There is a correlation between the number
> > of small accidents and large accidents ( saying they
> > are really accidents and not some kind of premeditated thing)
> >
> > So you watch the number of small accidents or the frequency thereof
> > and when you see the sudden increase of small ones
> > then a big one is right around the corner if you do not
> > do something right away to reduce the small ones.
> >
> > There seems to be a relationship between accidents
> > and Earthquakes, I'm not a mathematician in Statistical
> > things ( other things neither) but it seems it may be a kind of law of
> > nature
> > the way both of these things are behaving.
> > Does anyone concur ??
> >
> > geoff
> >
> >
> > __________________________________________________________
> >
> > Public Seismic Network Mailing List (PSN-L)
> >
> > To leave this list email PSN-L-REQUEST@.............. with the body of the
> > message (first line only): unsubscribe
> > See http://www.seismicnet.com/maillist.html for more information.
>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: English Channel Events
From: "Marchal van Lare"  vanlare@............. 
Date: Thu, 21 May 2009 00:05:45 +0200

Hi,

The waveform of the detonation looks different when compared to that of =
a real event. The detonation took place at a depth of only 30 metres (on =
or a little under the seabed). The waveform of an explosion gets =
distorded and could be interpreted as a real natural event.

Regards,

Marchal
  ----- Original Message -----=20
  From: JAMES RIDOUT=20
  To: psn-l@.................
  Sent: Tuesday, May 19, 2009 10:18 PM
  Subject: Re: English Channel Events


        Hi, The depth of that event was 6.7km, Would that really have =
such an efect on the surface?

        --- On Tue, 19/5/09, Marchal van Lare <vanlare@.............> =
wrote:

          From: Marchal van Lare <vanlare@.............>
          Subject: Re: English Channel Events
          To: psn-l@..............
          Date: Tuesday, 19 May, 2009, 8:34 PM


          Hi,=20

          They are clearing a WWII German mine in that Youtube movie, =
the authorities think there are still 100.000 to 300.000 old mines on =
the seabeds in the Channel and the North Sea.

          Before 2005, about 50 of those old mines were localised =
yearly. In 2005 a deadly accident occured with a Dutch fishingboat; =
since then about 50 a month (!) of those old sea mines are localized. =
This explains those swarms of events also; the detonations need to be =
carried out during quiet weather.

          Regards, Marchal

          ----- Original Message -----=20
            From: JAMES RIDOUT=20
            To: psn-l@.................
            Sent: Tuesday, May 19, 2009 9:15 PM
            Subject: Re: English Channel Events


                  Hi, Thats great!, What are they blowing up? WW2 Mines, =
or testing something?

                  --- On Tue, 19/5/09, Marchal van Lare =
<vanlare@.............> wrote:

                    From: Marchal van Lare <vanlare@.............>
                    Subject: English Channel Events
                    To: psn-l@..............
                    Date: Tuesday, 19 May, 2009, 8:09 PM


                    Hi all,

                    Remember the discussion a little while ago about the =
English Channel 'swarm'; check out the video on youtube: =
http://www.youtube.com/watch?v=3DH33XlT9Oxlk

                    The video is made by someone aboard a Dutch =
minesweeper close to the Normandy coast (France). The video was shot on =
April 23rd ~17:40 UTC and the detonation was responsible for the event =
reported by the BGS: =
http://www.quakes.bgs.ac.uk/recent_events/20090423174150.3.html

                    Regards,

                    Marchal=20
      =20
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hi,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>The waveform of the detonation looks =
different when=20
compared to that of a real event. The detonation took place at a depth =
of only=20
30 metres (on or a little under the seabed). The waveform of an =
explosion gets=20
distorded and could be interpreted as a real natural event.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Regards,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Marchal</FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Djamesridout@.................
  href=3D"mailto:jamesridout@..............">JAMES RIDOUT</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, May 19, 2009 =
10:18=20
PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: English Channel =
Events</DIV>
  <DIV><BR></DIV>
  <TABLE cellSpacing=3D0 cellPadding=3D0 border=3D0>
    <TBODY>
    <TR>
      <TD vAlign=3Dtop>Hi,&nbsp;The depth of that event was 6.7km, Would =
that=20
        really have such an efect on the surface?<BR><BR>--- On <B>Tue, =
19/5/09,=20
        Marchal van Lare <I>&lt;<A=20
        =
href=3D"mailto:vanlare@.............">vanlare@.............</A>&gt;</I></=
B>=20
        wrote:<BR>
        <BLOCKQUOTE=20
        style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: =
rgb(16,16,255) 2px solid">From:=20
          Marchal van Lare &lt;<A=20
          =
href=3D"mailto:vanlare@.............">vanlare@.............</A>&gt;<BR>Su=
bject:=20
          Re: English Channel Events<BR>To: <A=20
          =
href=3D"mailto:psn-l@..............">psn-l@..............</A><BR>Date:=20
          Tuesday, 19 May, 2009, 8:34 PM<BR><BR>
          <DIV id=3Dyiv1528952572>
          <DIV><FONT face=3DArial size=3D2>Hi, </FONT></DIV>
          <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
          <DIV><FONT face=3DArial size=3D2>They are clearing a WWII =
German mine in=20
          that Youtube movie, the authorities think there are still =
100.000 to=20
          300.000 old mines on the seabeds in the Channel and the North=20
          Sea.</FONT></DIV>
          <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
          <DIV><FONT face=3DArial size=3D2>Before 2005, about 50 of =
those old mines=20
          were localised yearly. In 2005 a deadly accident occured with =
a Dutch=20
          fishingboat; since then about 50 a month (!) of those old sea =
mines=20
          are localized. This explains those swarms of events also; the=20
          detonations need to be carried out during quiet =
weather.</FONT></DIV>
          <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
          <DIV><FONT face=3DArial size=3D2>Regards, Marchal</FONT></DIV>
          <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
          <DIV>----- Original Message ----- </DIV>
          <BLOCKQUOTE=20
          style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: =
5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
            <DIV style=3D"BACKGROUND: #e4e4e4; FONT: 10pt =
arial"><B>From:</B> <A=20
            title=3Djamesridout@.................
            href=3D"mailto:jamesridout@.............." target=3D_blank=20
            rel=3Dnofollow>JAMES RIDOUT</A> </DIV>
            <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
            title=3Dpsn-l@.............. =
href=3D"mailto:psn-l@.............."=20
            target=3D_blank rel=3Dnofollow>psn-l@..............</A> =
</DIV>
            <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, May =
19, 2009=20
            9:15 PM</DIV>
            <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: English =
Channel=20
            Events</DIV>
            <DIV><BR></DIV>
            <TABLE cellSpacing=3D0 cellPadding=3D0 border=3D0>
              <TBODY>
              <TR>
                <TD vAlign=3Dtop>Hi, Thats great!, What are they blowing =
up? WW2=20
                  Mines, or testing something?<BR><BR>--- On <B>Tue, =
19/5/09,=20
                  Marchal van Lare <I>&lt;<A =
href=3D"mailto:vanlare@............."=20
                  target=3D_blank=20
                  rel=3Dnofollow>vanlare@.............</A>&gt;</I></B> =
wrote:<BR>
                  <BLOCKQUOTE=20
                  style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: rgb(16,16,255) 2px solid">From:=20
                    Marchal van Lare &lt;<A =
href=3D"mailto:vanlare@............."=20
                    target=3D_blank=20
                    =
rel=3Dnofollow>vanlare@.............</A>&gt;<BR>Subject:=20
                    English Channel Events<BR>To: <A=20
                    href=3D"mailto:psn-l@.............." target=3D_blank =

                    rel=3Dnofollow>psn-l@..............</A><BR>Date: =
Tuesday, 19=20
                    May, 2009, 8:09 PM<BR><BR>
                    <DIV id=3Dyiv1790344872>
                    <STYLE></STYLE>

                    <DIV><FONT face=3DArial size=3D2>Hi =
all,</FONT></DIV>
                    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
                    <DIV><FONT face=3DArial size=3D2>Remember&nbsp;the =
discussion a=20
                    little while ago about the English Channel 'swarm'; =
check=20
                    out the video on youtube: <A=20
                    =
href=3D"http://www.youtube.com/watch?v=3DH33XlT9Oxlk"=20
                    target=3D_blank=20
                    =
rel=3Dnofollow>http://www.youtube.com/watch?v=3DH33XlT9Oxlk</A></FONT></D=
IV>
                    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
                    <DIV><FONT face=3DArial size=3D2>The video is made =
by someone=20
                    aboard a Dutch minesweeper close to the Normandy =
coast=20
                    (France).&nbsp;The video&nbsp;was shot on April=20
                    23rd&nbsp;~17:40 UTC and the detonation was =
responsible for=20
                    the event reported by the BGS: <A=20
                    =
href=3D"http://www.quakes.bgs.ac.uk/recent_events/20090423174150.3.html" =

                    target=3D_blank=20
                    =
rel=3Dnofollow>http://www.quakes.bgs.ac.uk/recent_events/20090423174150.3=
..html</A></FONT></DIV>
                    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
                    <DIV><FONT face=3DArial =
size=3D2>Regards,</FONT></DIV>
                    <DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
                    <DIV><FONT face=3DArial=20
                  =
size=3D2>Marchal</FONT></DIV></DIV></BLOCKQUOTE></TD></TR></TBODY></TABLE=
></BLOCKQUOTE></DIV></BLOCKQUOTE></TD></TR></TBODY></TABLE></BLOCKQUOTE><=
/BODY></HTML>

Subject: Did I get 12 second period ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sun, 24 May 2009 20:35:23 +0000

Hi all

I did one little change to my lehman seismometer. I did rase the front
of the seismomter up from where it was. This appears to have incresed
it's period to about 12 seconds.

Here is are pictures of what I did.
http://www.jonfr.com/myndir/v/geology/lehman/p5240001.jpg.html

I can send psn file to anyone how wants.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Gurlap CMG-5T
From: "tchannel"  tchannel@............ 
Date: Sun, 24 May 2009 14:46:07 -0600

Hi Folks, =20
I have been reading  about the Gurlap CMG-5T Triaxial Accelerometer.   I =
have found the operator's guide as a pdf file.

Just curious what is inside the housing.   I am not going to purchase =
one, but I see the manufacture mentioned from time to time.   Does =
anyone have a pictures of the inside, or an explanation of it's inner =
workings.   I also could not find a price,  just curious of the price =
range.

Thanks, Ted
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial><FONT size=3D3>Hi Folks</FONT>,&nbsp;=20
<P><FONT size=3D3>I have been reading&nbsp; about the Gurlap CMG-5T =
Triaxial=20
Accelerometer.&nbsp;&nbsp; I have found the operator's guide as a pdf=20
file.</FONT></P>
<P><FONT size=3D3>Just curious what is inside the housing.&nbsp;&nbsp; I =
am not=20
going to purchase one, but I see the manufacture mentioned from time to=20
time.&nbsp;&nbsp; Does anyone have a pictures of the inside, or an =
explanation=20
of it's inner workings.&nbsp;&nbsp; I also could not find a price,&nbsp; =
just=20
curious of the price range.</FONT></P>
<P><FONT size=3D3>Thanks, Ted</FONT></P></FONT></DIV></BODY></HTML>

Subject: Possible big earthquake going to hit Greece/Macedonia soon
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sun, 24 May 2009 23:20:27 +0000

Hi all

There has been a large swarm in Greece/Macedonia today. I find it
possible that there might be big earthquake there soon. However, the
data so far is unclear on if that is going to happen or not.

EMSC has great info on the earthquakes that have happened so far.

http://www.emsc-csem.org/index.php?page=3Dcurrent&sub=3Dlist

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: RE: Possible big earthquake going to hit Greece/Macedonia soon
From: "Kareem Lanier"  system98765@............. 
Date: Sun, 24 May 2009 16:22:41 -0700

My ear is to the ground.

Is the swarm deeper than their usual swarm depths?=20

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Sunday, May 24, 2009 4:20 PM
To: PSN-Postlist
Subject: Possible big earthquake going to hit Greece/Macedonia soon

Hi all

There has been a large swarm in Greece/Macedonia today. I find it =
possible
that there might be big earthquake there soon. However, the data so far =
is
unclear on if that is going to happen or not.

EMSC has great info on the earthquakes that have happened so far.

http://www.emsc-csem.org/index.php?page=3Dcurrent&sub=3Dlist

Regards.
--
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

http://www.seismicnet.com/maillist.html for more information.

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Subject: RE: Possible big earthquake going to hit Greece/Macedonia soon
From: "Kareem Lanier"  system98765@............. 
Date: Sun, 24 May 2009 16:22:41 -0700

My ear is to the ground.

Is the swarm deeper than their usual swarm depths?=20

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Sunday, May 24, 2009 4:20 PM
To: PSN-Postlist
Subject: Possible big earthquake going to hit Greece/Macedonia soon

Hi all

There has been a large swarm in Greece/Macedonia today. I find it =
possible
that there might be big earthquake there soon. However, the data so far =
is
unclear on if that is going to happen or not.

EMSC has great info on the earthquakes that have happened so far.

http://www.emsc-csem.org/index.php?page=3Dcurrent&sub=3Dlist

Regards.
--
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

http://www.seismicnet.com/maillist.html for more information.

__________________________________________________________

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Subject: Re: Did I get 12 second period ?
From: "Geoffrey"  gmvoeth@........... 
Date: Sun, 24 May 2009 22:48:29 -0700

It Seems To Me your floor was not level to begin with ?
You most probably needed an angle of 1 degree or less
from level ?
I figure a little over 2 degrees for only 5 seconds
using trig to figure the effect on the acceleration
of gravity.
P=2PiSQR(L/g)
P = period in seconds
Pi = 3.121(whatever)
SQR = SQUARE ROOT OF()
L = length of pendulum in inches
g = gravity in inches per (second squared)
g' = SINE or COSINE of the anglular displacement from zero g

If you fix L
at current gravity
you change angle according to
SINE or COSINE
like g sin(angle) relative to horizontal
or vertical.
At vertical you got full g
but at horizontal or inverted its zero.
Sort of vectored by a lever arm.
A spring with a linear constant acts
just like a pendulum.
If it takes 10 inches to get one second on a
pendulum it also takes ten inches of extension
of a spring to get one second.
Or so it seems to me.
In Physics class we used this frictionless
puck floating on a rail at different angles
to show how it could affect the acceleration.
Frictionless on a cushion of air.


----- Original Message ----- 
From: "Jón Frímann" <jonfr@.........>
To: "PSN-Postlist" <PSN-L@..............>
Sent: Sunday, May 24, 2009 1:35 PM
Subject: Did I get 12 second period ?


Hi all

I did one little change to my lehman seismometer. I did rase the front
of the seismomter up from where it was. This appears to have incresed
it's period to about 12 seconds.

Here is are pictures of what I did.
http://www.jonfr.com/myndir/v/geology/lehman/p5240001.jpg.html

I can send psn file to anyone how wants.

Regards.
-- 
Jón Frímann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Did I get 12 second period ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Mon, 25 May 2009 12:54:38 +0000

Hi

The floor is level, this is the same floor where I keep my geophone,
with any issues.

However, the lehman sensor appears to be this high so I can get 12 to 20
second period. I am not sure why that is.

The only problem that I am dealing with now is that once I have setup
the correct period. I something find that the coil slides to the magnets
and gets stuck there. I do not know why that movment happens. I am
trying to fix that issue.

Regards.
J=F3n Fr=EDmann.

On sun, 2009-05-24 at 22:48 -0700, Geoffrey wrote:
> It Seems To Me your floor was not level to begin with ?
> You most probably needed an angle of 1 degree or less
> from level ?
> I figure a little over 2 degrees for only 5 seconds
> using trig to figure the effect on the acceleration
> of gravity.
> P=3D2PiSQR(L/g)
> P =3D period in seconds
> Pi =3D 3.121(whatever)
> SQR =3D SQUARE ROOT OF()
> L =3D length of pendulum in inches
> g =3D gravity in inches per (second squared)
> g' =3D SINE or COSINE of the anglular displacement from zero g
>=20
> If you fix L
> at current gravity
> you change angle according to
> SINE or COSINE
> like g sin(angle) relative to horizontal
> or vertical.
> At vertical you got full g
> but at horizontal or inverted its zero.
> Sort of vectored by a lever arm.
> A spring with a linear constant acts
> just like a pendulum.
> If it takes 10 inches to get one second on a
> pendulum it also takes ten inches of extension
> of a spring to get one second.
> Or so it seems to me.
> In Physics class we used this frictionless
> puck floating on a rail at different angles
> to show how it could affect the acceleration.
> Frictionless on a cushion of air.
>=20
>=20
> ----- Original Message -----=20
> From: "J=F3n Fr=EDmann" <jonfr@.........>
> To: "PSN-Postlist" <PSN-L@..............>
> Sent: Sunday, May 24, 2009 1:35 PM
> Subject: Did I get 12 second period ?
>=20
>=20
> Hi all
>=20
> I did one little change to my lehman seismometer. I did rase the front
> of the seismomter up from where it was. This appears to have incresed
> it's period to about 12 seconds.
>=20
> Here is are pictures of what I did.
> http://www.jonfr.com/myndir/v/geology/lehman/p5240001.jpg.html
>=20
> I can send psn file to anyone how wants.
>=20
> Regards.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: RE: Did I get 12 second period ?
From: "Gary Lindgren"  gel@................. 
Date: Mon, 25 May 2009 08:31:12 -0700

Hi Jon,
Now you want to adjust the beam to be horizontal again. And what do you =
have
as the feet for your seismo. They look rubber tipped, I suggest brass or
stainless steel acorn nuts. You don't want the feet to act as a cushion.
Gary




-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... =
On
Behalf Of J=F3n Fr=EDmann
Sent: Sunday, May 24, 2009 1:35 PM
To: PSN-Postlist
Subject: Did I get 12 second period ?

Hi all

I did one little change to my lehman seismometer. I did rase the front
of the seismomter up from where it was. This appears to have incresed
it's period to about 12 seconds.

Here is are pictures of what I did.
http://www.jonfr.com/myndir/v/geology/lehman/p5240001.jpg.html

I can send psn file to anyone how wants.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Did I get 12 second period ?
From: "Geoffrey"  gmvoeth@........... 
Date: Mon, 25 May 2009 11:00:38 -0700

Hello Mr. Frimann;

I understand you live in cold country.
Could it be possible that ice will
somehow throw your entire
house out of level however slight
that may be ??
Freezing around the foundation ?
An error of only a fraction of a degree
from level will make a difference with the device
you are using. By comparison a geophone
will operate with more slop ( greater displacement
in orientation ). I think my geophone has a slop of
5 degrees from level. ( HS-10-1 ).
Possibly there is something magnetic on your boom
attracting to the magnets ??
regards
geoff

----- Original Message ----- 
From: "Jón Frímann" <jonfr@.........>
To: <psn-l@..............>
Sent: Monday, May 25, 2009 5:54 AM
Subject: Re: Did I get 12 second period ?


Hi

The floor is level, this is the same floor where I keep my geophone,
with any issues.

However, the lehman sensor appears to be this high so I can get 12 to 20
second period. I am not sure why that is.

The only problem that I am dealing with now is that once I have setup
the correct period. I something find that the coil slides to the magnets
and gets stuck there. I do not know why that movment happens. I am
trying to fix that issue.

Regards.
Jón Frímann.

On sun, 2009-05-24 at 22:48 -0700, Geoffrey wrote:
> It Seems To Me your floor was not level to begin with ?
> You most probably needed an angle of 1 degree or less
> from level ?
> I figure a little over 2 degrees for only 5 seconds
> using trig to figure the effect on the acceleration
> of gravity.
> P=2PiSQR(L/g)
> P = period in seconds
> Pi = 3.121(whatever)
> SQR = SQUARE ROOT OF()
> L = length of pendulum in inches
> g = gravity in inches per (second squared)
> g' = SINE or COSINE of the anglular displacement from zero g
>
> If you fix L
> at current gravity
> you change angle according to
> SINE or COSINE
> like g sin(angle) relative to horizontal
> or vertical.
> At vertical you got full g
> but at horizontal or inverted its zero.
> Sort of vectored by a lever arm.
> A spring with a linear constant acts
> just like a pendulum.
> If it takes 10 inches to get one second on a
> pendulum it also takes ten inches of extension
> of a spring to get one second.
> Or so it seems to me.
> In Physics class we used this frictionless
> puck floating on a rail at different angles
> to show how it could affect the acceleration.
> Frictionless on a cushion of air.
>
>
> ----- Original Message ----- 
> From: "Jón Frímann" <jonfr@.........>
> To: "PSN-Postlist" <PSN-L@..............>
> Sent: Sunday, May 24, 2009 1:35 PM
> Subject: Did I get 12 second period ?
>
>
> Hi all
>
> I did one little change to my lehman seismometer. I did rase the front
> of the seismomter up from where it was. This appears to have incresed
> it's period to about 12 seconds.
>
> Here is are pictures of what I did.
> http://www.jonfr.com/myndir/v/geology/lehman/p5240001.jpg.html
>
> I can send psn file to anyone how wants.
>
> Regards.

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: 4.7 North Korea?  Possibably nuclear test?
From: "tchannel"  tchannel@............ 
Date: Mon, 25 May 2009 15:39:44 -0600

Hi Folks,  Did anyone pick this up??   I have a very unusual signal =
during this hour,  I will process it asap. =20

=20
The shallow, magnitude 4.7 seismic event that occurred on 25 May 2009 at =
00:54:43 UTC is linked to the claim of a nuclear test by North Korean =
officials. While the USGS cannot positively identify the seismic event =
as a nuclear test, it was shallow and located in the vicinity of the 9 =
October 2006 North Korean nuclear test (magnitude 4.3). Moreover, =
comparisons of the seismograms of the 9 October 2006 and 25 May 2009 =
events at individual seismic stations shows similar features, suggesting =
that the two events are in close spatial proximity and are the same type =
of source, although the more recent event is larger.

Thanks, Ted
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>Hi Folks,&nbsp; Did anyone pick this=20
up??&nbsp;&nbsp; I have a very unusual signal during this hour,&nbsp; I =
will=20
process it asap.&nbsp;&nbsp;</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>The shallow, magnitude 4.7 seismic event that occurred on 25 May =
2009 at=20
00:54:43 UTC is linked to the claim of a nuclear test by North Korean =
officials.=20
While the USGS cannot positively identify the seismic event as a nuclear =
test,=20
it was shallow and located in the vicinity of the <A=20
href=3D"http://earthquake.usgs.gov/eqcenter/eqinthenews/2006/ustqab/">9 =
October=20
2006 North Korean nuclear test</A> (magnitude 4.3). Moreover, =
comparisons of the=20
seismograms of the 9 October 2006 and 25 May 2009 events at individual =
seismic=20
stations shows similar features, suggesting that the two events are in =
close=20
spatial proximity and are the same type of source, although the more =
recent=20
event is larger.</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Thanks, Ted</FONT></DIV></BODY></HTML>

Subject: North Korea
From: "tchannel"  tchannel@............ 
Date: Mon, 25 May 2009 16:02:45 -0600

Hi Again,  No, I did not get it........No surprise, too small for me.   =
I had some noise during this time, but it was definitely just noise.

Ted
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>Hi Again,&nbsp; No, I did not get =
it........No=20
surprise, too small for me.&nbsp;&nbsp; I had some noise during this =
time, but=20
it was definitely just noise.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Ted</FONT></DIV></BODY></HTML>

Subject: Re: Did I get 12 second period ?
From: ChrisAtUpw@.......
Date: Mon, 25 May 2009 18:23:27 EDT

In a message dated 25/05/2009, gmvoeth@........... writes:

The  floor is level, this is the same floor where I keep my geophone, with 
any  issues.

However, the lehman sensor appears to be this high so I can get  12 to 20
second period. I am not sure why that is.
Hi Jon,
 
    It is the angle between the local vertical and the  line joining the 
centres of rotation of the top and bottom bearings which  determines the 
period.
    _http://www.jonfr.com/myndir/v/geology/lehman/p5100003.jpg.html_ 
(http://www.jonfr.com/myndir/v/geology/lehman/p5100003.jpg.html)  shows  the 
bottom bearing. You need to loosen the nuts and unscrew them so that the  head of 
the bolt is a few mm or more further AWAY from the bottom cross bar,  
towards the mass. The tighten the nuts again. You will also have to adjust  the 
top suspension. Maybe adjust the top suspension so that the bolt head is  
further away from the mass end?

The only  problem that I am dealing with now is that once I have setup the 
correct  period. I sometimes find that the coil slides to the magnets and 
gets stuck  there. I do not know why that movment happens. 
    _http://www.jonfr.com/myndir/v/geology/lehman/p5100005.jpg.html_ 
(http://www.jonfr.com/myndir/v/geology/lehman/p5100005.jpg.html) 



You have a bolt through the centre of the coil and  another one suspending 
it from the arm. Are these bolts, nuts,  washers completely NON MAGNETIC? 
eg.Brass and not nickel plated? Can you  replace the metal bolt through the 
coil with a nylon bolt? Maybe bolt or stick  the coil to a sheet of fibreglass 
/ plastic and attach this to the arm?
    What metal is the plate supporting the  magnet?
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>In a message dated 25/05/2009, gmvoeth@........... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>The 
  floor is level, this is the same floor where I keep my geophone, with an=
y 
  issues.<BR><BR>However, the lehman sensor appears to be this high so I=
 can get 
  12 to 20<BR>second period. I am not sure why that is.</FONT></BLOCKQUOTE=
>
<DIV>Hi Jon,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;It is the angle between the local vertical an=
d the 
line joining the centres of rotation of the top and bottom bearings which=
 
determines the period.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;<A 
href=3D"http://www.jonfr.com/myndir/v/geology/lehman/p5100003.jpg.html">ht=
tp://www.jonfr.com/myndir/v/geology/lehman/p5100003.jpg.html</A>&nbsp;show=
s 
the bottom bearing. You need to loosen the nuts and unscrew them so that=
 the 
head of the bolt is a few mm or more further AWAY from the bottom cross ba=
r, 
towards the mass. The tighten the nuts again.&nbsp;You will also have to=
 adjust 
the top suspension. Maybe adjust the top suspension so that the bolt head=
 is 
further away from the mass end?</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>The only 
  problem that I am dealing with now is that once I have setup the correct=
 
  period. I sometimes find that the coil slides to the magnets and gets st=
uck 
  there. I do not know why that movment happens. </FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;<A 
href=3D"http://www.jonfr.com/myndir/v/geology/lehman/p5100005.jpg.html">ht=
tp://www.jonfr.com/myndir/v/geology/lehman/p5100005.jpg.html</A></DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0=
00000 
size=3D2><BR>&nbsp;</DIV></FONT>
<DIV></DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You have a bolt through the centre of the coi=
l and 
another one&nbsp;suspending it from the arm. Are these bolts, nuts, 
washers&nbsp;completely NON MAGNETIC? eg.Brass and not nickel plated? Can=
 you 
replace the metal bolt through the coil with a nylon bolt? Maybe bolt or=
 stick 
the coil to a sheet of fibreglass / plastic and attach this to the arm?</D=
IV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;What metal is the plate supporting the 
magnet?</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Re: Did I get 12 second period ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Mon, 25 May 2009 23:43:21 +0000

Hi all

After spending almost thee hours on the setup on the sensor. It appears
that I have managed to get ~15 second period, at least that is what
early resault tell me, I don't think I can get any better then that. I
did solve the magent pull issue by incresing the distance between the
coil and the magnet, it still gives signal. Everything that comes close
to the magent is made out of non-magnetic stuff, but for some unkown
reason there was magnetic pull.

The setup is not much diffrent. But I did change about the legs, so
there is no soft spot under them any more.

Current housing build rules state that gravel must be put around basis
of a house. The ground also only freezes 70 cm over the winter here in
Iceland. The place where I live is build on a bedrock that goes down few
km, I would guess.

Regards.
J=F3n Fr=EDmann.



On m=E1n, 2009-05-25 at 18:23 -0400, ChrisAtUpw@....... wrote:
> In a message dated 25/05/2009, gmvoeth@........... writes:
>         The floor is level, this is the same floor where I keep my
>         geophone, with any issues.
>        =20
>         However, the lehman sensor appears to be this high so I can
>         get 12 to 20
>         second period. I am not sure why that is.
> Hi Jon,
> =20
>     It is the angle between the local vertical and the line joining
> the centres of rotation of the top and bottom bearings which
> determines the period.
>     http://www.jonfr.com/myndir/v/geology/lehman/p5100003.jpg.html shows =
the bottom bearing. You need to loosen the nuts and unscrew them so that th=
e head of the bolt is a few mm or more further AWAY from the bottom cross b=
ar, towards the mass. The tighten the nuts again. You will also have to adj=
ust the top suspension. Maybe adjust the top suspension so that the bolt he=
ad is further away from the mass end?
>         The only problem that I am dealing with now is that once I
>         have setup the correct period. I sometimes find that the coil
>         slides to the magnets and gets stuck there. I do not know why
>         that movment happens.=20
>     http://www.jonfr.com/myndir/v/geology/lehman/p5100005.jpg.html
>=20
> =20
>=20
>     You have a bolt through the centre of the coil and another
> one suspending it from the arm. Are these bolts, nuts,
> washers completely NON MAGNETIC? eg.Brass and not nickel plated? Can
> you replace the metal bolt through the coil with a nylon bolt? Maybe
> bolt or stick the coil to a sheet of fibreglass / plastic and attach
> this to the arm?
>     What metal is the plate supporting the magnet?
> =20
>     Regards,
> =20
>     Chris Chapman

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Did I get 12 second period ?
From: "Geoffrey"  gmvoeth@........... 
Date: Tue, 26 May 2009 06:18:50 -0700

You Lucky Devil being on bedrock of Granite or ??
I got to go 800 feet underground to get to bedrock.


Have you considered possibly static electric charges
as causing the attraction on your boom ?

I have found when its very dry in the summer here
in AZ my whole place is charged like a rubber balloon
and until I grounded everything caused great problems
with my amplifier giving me bogus signals. It was
more like a proximity sensor than an EQ detector.
Use high quality microphone cable ( 100% shielded )
for all connections even power. Ground everything
but prevent ground loops from forming by cutting the shield
before it reaches the thing its going to from
the amplifier. Ground loops are unwanted stray AC/DC currents
circulating within the ground itself. Can be induced like in
a transformer.
Or so I understand.



----- Original Message ----- 
From: "Jón Frímann" <jonfr@.........>
To: <psn-l@..............>
Sent: Monday, May 25, 2009 4:43 PM
Subject: Re: Did I get 12 second period ?


Hi all

After spending almost thee hours on the setup on the sensor. It appears
that I have managed to get ~15 second period, at least that is what
early resault tell me, I don't think I can get any better then that. I
did solve the magent pull issue by incresing the distance between the
coil and the magnet, it still gives signal. Everything that comes close
to the magent is made out of non-magnetic stuff, but for some unkown
reason there was magnetic pull.

The setup is not much diffrent. But I did change about the legs, so
there is no soft spot under them any more.

Current housing build rules state that gravel must be put around basis
of a house. The ground also only freezes 70 cm over the winter here in
Iceland. The place where I live is build on a bedrock that goes down few
km, I would guess.

Regards.
Jón Frímann.



On mán, 2009-05-25 at 18:23 -0400, ChrisAtUpw@....... wrote:
> In a message dated 25/05/2009, gmvoeth@........... writes:
>         The floor is level, this is the same floor where I keep my
>         geophone, with any issues.
>
>         However, the lehman sensor appears to be this high so I can
>         get 12 to 20
>         second period. I am not sure why that is.
> Hi Jon,
>
>     It is the angle between the local vertical and the line joining
> the centres of rotation of the top and bottom bearings which
> determines the period.
>     http://www.jonfr.com/myndir/v/geology/lehman/p5100003.jpg.html shows the bottom bearing. You need to loosen the nuts and
> unscrew them so that the head of the bolt is a few mm or more further AWAY from the bottom cross bar, towards the mass. The
> tighten the nuts again. You will also have to adjust the top suspension. Maybe adjust the top suspension so that the bolt head is
> further away from the mass end?
>         The only problem that I am dealing with now is that once I
>         have setup the correct period. I sometimes find that the coil
>         slides to the magnets and gets stuck there. I do not know why
>         that movment happens.
>     http://www.jonfr.com/myndir/v/geology/lehman/p5100005.jpg.html
>
>
>
>     You have a bolt through the centre of the coil and another
> one suspending it from the arm. Are these bolts, nuts,
> washers completely NON MAGNETIC? eg.Brass and not nickel plated? Can
> you replace the metal bolt through the coil with a nylon bolt? Maybe
> bolt or stick the coil to a sheet of fibreglass / plastic and attach
> this to the arm?
>     What metal is the plate supporting the magnet?
>
>     Regards,
>
>     Chris Chapman

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Did I get 12 second period ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Tue, 26 May 2009 22:09:11 +0000

Hi

The bedrock is made out of basalt, it is the most common rock in
Iceland. I live in a slope of a extint volcano and this is one of it's
older lave flows that I am top of.

I found out why the attraction was happeing. The boom is made out of
iron and in 15 second setup it is so sensitive that the magnet
attratching it when it is too close. I am going to fix that issue
tomorrow by replacing the boom the aluminum one that I have. I cannot
use it now, as I need to do minor changes to it so it works properly.

Regards.
J=F3n Fr=EDmann.

On =FEri, 2009-05-26 at 06:18 -0700, Geoffrey wrote:
> You Lucky Devil being on bedrock of Granite or ??
> I got to go 800 feet underground to get to bedrock.
>=20
>=20
> Have you considered possibly static electric charges
> as causing the attraction on your boom ?
>=20
> I have found when its very dry in the summer here
> in AZ my whole place is charged like a rubber balloon
> and until I grounded everything caused great problems
> with my amplifier giving me bogus signals. It was
> more like a proximity sensor than an EQ detector.
> Use high quality microphone cable ( 100% shielded )
> for all connections even power. Ground everything
> but prevent ground loops from forming by cutting the shield
> before it reaches the thing its going to from
> the amplifier. Ground loops are unwanted stray AC/DC currents
> circulating within the ground itself. Can be induced like in
> a transformer.
> Or so I understand.
>=20
>=20
>=20
> ----- Original Message -----=20
> From: "J=F3n Fr=EDmann" <jonfr@.........>
> To: <psn-l@..............>
> Sent: Monday, May 25, 2009 4:43 PM
> Subject: Re: Did I get 12 second period ?
>=20
>=20
> Hi all
>=20
> After spending almost thee hours on the setup on the sensor. It appears
> that I have managed to get ~15 second period, at least that is what
> early resault tell me, I don't think I can get any better then that. I
> did solve the magent pull issue by incresing the distance between the
> coil and the magnet, it still gives signal. Everything that comes close
> to the magent is made out of non-magnetic stuff, but for some unkown
> reason there was magnetic pull.
>=20
> The setup is not much diffrent. But I did change about the legs, so
> there is no soft spot under them any more.
>=20
> Current housing build rules state that gravel must be put around basis
> of a house. The ground also only freezes 70 cm over the winter here in
> Iceland. The place where I live is build on a bedrock that goes down few
> km, I would guess.
>=20
> Regards.
> J=F3n Fr=EDmann.
>=20
>=20
>=20
> On m=E1n, 2009-05-25 at 18:23 -0400, ChrisAtUpw@....... wrote:
> > In a message dated 25/05/2009, gmvoeth@........... writes:
> >         The floor is level, this is the same floor where I keep my
> >         geophone, with any issues.
> >
> >         However, the lehman sensor appears to be this high so I can
> >         get 12 to 20
> >         second period. I am not sure why that is.
> > Hi Jon,
> >
> >     It is the angle between the local vertical and the line joining
> > the centres of rotation of the top and bottom bearings which
> > determines the period.
> >     http://www.jonfr.com/myndir/v/geology/lehman/p5100003.jpg.html show=
s the bottom bearing. You need to loosen the nuts and
> > unscrew them so that the head of the bolt is a few mm or more further A=
WAY from the bottom cross bar, towards the mass. The
> > tighten the nuts again. You will also have to adjust the top suspension=
.. Maybe adjust the top suspension so that the bolt head is
> > further away from the mass end?
> >         The only problem that I am dealing with now is that once I
> >         have setup the correct period. I sometimes find that the coil
> >         slides to the magnets and gets stuck there. I do not know why
> >         that movment happens.
> >     http://www.jonfr.com/myndir/v/geology/lehman/p5100005.jpg.html
> >
> >
> >
> >     You have a bolt through the centre of the coil and another
> > one suspending it from the arm. Are these bolts, nuts,
> > washers completely NON MAGNETIC? eg.Brass and not nickel plated? Can
> > you replace the metal bolt through the coil with a nylon bolt? Maybe
> > bolt or stick the coil to a sheet of fibreglass / plastic and attach
> > this to the arm?
> >     What metal is the plate supporting the magnet?
> >
> >     Regards,
> >
> >     Chris Chapman
>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with
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>=20
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.

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Subject: Honduras quake 5/28
From: Thomas Dick  dickthomas01@............. 
Date: Thu, 28 May 2009 06:37:53 -0500

Anybody else having trouble using USGS data and finding P off by as much 
as 30 seconds?
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Public Seismic Network Mailing List (PSN-L)


Subject: Re: Honduras quake 5/28
From: "tchannel"  tchannel@............ 
Date: Thu, 28 May 2009 06:10:36 -0600

Thomas,  No, my P seems correct.
Ted


----- Original Message ----- 
From: "Thomas Dick" <dickthomas01@.............>
To: <psn-l@..............>
Sent: Thursday, May 28, 2009 5:37 AM
Subject: Honduras quake 5/28


> Anybody else having trouble using USGS data and finding P off by as much 
> as 30 seconds?
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
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Subject: Re: Honduras quake 5/28
From: Bob Hancock  icarus@......... 
Date: Thu, 28 May 2009 06:52:09 -0700

I checked the P arrival time time at my station TPA  (32.100883   
-111.334383) using the USGS Phase arrival time program, and the  
variance was + 0.7 seconds.  The computed travel time was 345.93  
seconds.  See link for program.

http://neic.usgs.gov/neis/travel_times/compute_tt.html

I then checked the arrival time using the TauP Toolkit program  
available through either iIRIS, or the University of South Carolina.   
The travel time was listed as 344.93 seconds, and the variance was  
-0.3 sec.  NOTE - This is a Java based program.

These timing differences are normal and the result of different  
material that the waves pass through.

A 30 second variance suggests that the timing used at your station was  
off.

Bob Hancock

On May 28, 2009, at 4:37 AM, Thomas Dick wrote:

> Anybody else having trouble using USGS data and finding P off by as  
> much as 30 seconds?
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with the body  
> of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>

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Public Seismic Network Mailing List (PSN-L)


Subject: Re: Honduras quake 5/28
From: Thomas Dick  dickthomas01@............. 
Date: Thu, 28 May 2009 09:54:16 -0500


> Thomas,  No, my P seems correct.
Thanks both of you. I guess I was too sleepy. Came back up here after 
your remarks and it  fell where it was supposed to.
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Public Seismic Network Mailing List (PSN-L)


Subject: Re: Honduras quake 5/28
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Thu, 28 May 2009 18:44:39 +0000

Hi all

I got the Honduras earthquake, both on my geophone and on the
test-lehman setup that I have. The signal on the lehman sensor was poor,
both due to current setup and a storm front south of Iceland.

Regards.
J=F3n Fr=EDmann.

On fim, 2009-05-28 at 06:10 -0600, tchannel wrote:
> Thomas,  No, my P seems correct.
> Ted
>=20
>=20
> ----- Original Message -----=20
> From: "Thomas Dick" <dickthomas01@.............>
> To: <psn-l@..............>
> Sent: Thursday, May 28, 2009 5:37 AM
> Subject: Honduras quake 5/28
>=20
>=20
> > Anybody else having trouble using USGS data and finding P off by as muc=
h=20
> > as 30 seconds?
> > __________________________________________________________
> >=20
> > Public Seismic Network Mailing List (PSN-L)
> >=20
> > To leave this list email PSN-L-REQUEST@.............. with=20
> > the body of the message (first line only): unsubscribe
> > See http://www.seismicnet.com/maillist.html for more information.
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with=20
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.

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Subject: Honduras Quake 5/28/09
From: "Gary Lindgren"  gel@................. 
Date: Thu, 28 May 2009 14:07:25 -0700

That quake really came in strong on my Lehman. But I have a question, about
15 minutes after the P and S wave, the amplitude of the response just
explodes. What are we seeing here, how do I explain this to others.

Gary

 

 

 

 

Gary Lindgren

585 Lincoln Ave

Palo Alto CA 94301

 

650-326-0655

 

 <http://www.blue-eagle-technologies.com/> www.blue-eagle-technologies.com
Check out Lastest Seismometer Reading

 <http://www.cymonsplace.blogspot.com/> cymonsplace.blogspot.com 

 <http://dtvtransitioninfo.blogspot.com/> dtvtransitioninfo.blogspot.com
Information on how to cope with the transition to DTV 

 

 

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<div class=3DSection1>

<p class=3DMsoNormal>That quake really came in strong on my Lehman. But =
I have a
question, about 15 minutes after the P and S wave, the amplitude of the
response just explodes. What are we seeing here, how do I explain this =
to
others.<o:p></o:p></p>

<p class=3DMsoNormal>Gary<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;font-family:"Arial","sans-serif";
color:#548DD4'>Gary Lindgren</span></b><b><span =
style=3D'font-size:12.0pt;
color:#548DD4'><o:p></o:p></span></b></p>

<p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;font-family:"Arial","sans-serif";
color:#548DD4'>585 Lincoln Ave</span></b><b><span =
style=3D'font-size:12.0pt;
color:#548DD4'><o:p></o:p></span></b></p>

<p class=3DMsoNormal><b><span =
style=3D'font-size:12.0pt;font-family:"Arial","sans-serif";
color:#548DD4'>Palo Alto CA 94301</span></b><b><span =
style=3D'font-size:12.0pt;
color:#548DD4'><o:p></o:p></span></b></p>

<p class=3DMsoNormal>&nbsp;<o:p></o:p></p>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'>650-326-0655<=
/span><o:p></o:p></p>

<p class=3DMsoNormal>&nbsp;<o:p></o:p></p>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'><a
href=3D"http://www.blue-eagle-technologies.com/"><span =
style=3D'color:blue'>www.blue-eagle-technologies.com</span></a>&nbsp;&nbs=
p;
<span style=3D'color:red'>Check out Lastest Seismometer =
Reading</span></span><o:p></o:p></p>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'><a
href=3D"http://www.cymonsplace.blogspot.com/"><span =
style=3D'color:blue'>cymonsplace.blogspot.com</span></a>&nbsp;<o:p></o:p>=
</span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif"'><a
href=3D"http://dtvtransitioninfo.blogspot.com/"><span =
style=3D'color:blue'>dtvtransitioninfo.blogspot.com</span></a>&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
<span style=3D'color:red'>Information on how to cope with the transition =
to DTV</span>
</span><o:p></o:p></p>

<p class=3DMsoNormal>&nbsp;<o:p></o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

</div>

</body>

</html>

Subject: Re: Honduras Quake 5/28/09
From: Bob Hancock  icarus@......... 
Date: Thu, 28 May 2009 14:16:55 -0700

You are seeing the surface wave arrivals.  The waves are slower and  
travel through the crust of the earth rather than down into the mantel  
and returning.  The Love waves precede the Rayleigh waves.  The Love  
wave is a horizontal wave visible on the transverse channel.  The  
Rayleigh wave is a vertical wave that is visible on the vertical and  
radial channels.  Depending upon the orientation of a single channel  
horizontal instrument, and the ray path to the event, you could see  
both Love & Rayleigh waves.

Bob Hancock


On May 28, 2009, at 2:07 PM, Gary Lindgren wrote:

> That quake really came in strong on my Lehman. But I have a  
> question, about 15 minutes after the P and S wave, the amplitude of  
> the response just explodes. What are we seeing here, how do I  
> explain this to others.
> Gary
>
>
>
>
> Gary Lindgren
> 585 Lincoln Ave
> Palo Alto CA 94301
>
> 650-326-0655
>
> www.blue-eagle-technologies.com   Check out Lastest Seismometer  
> Reading
> cymonsplace.blogspot.com
> dtvtransitioninfo.blogspot.com        Information on how to cope  
> with the transition to DTV
>
>

<html><body style=3D"word-wrap: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space; "><div>You are seeing the surface =
wave arrivals. &nbsp;The waves are slower and travel through the crust =
of the earth rather than down into the mantel and returning. &nbsp;The =
Love waves&nbsp;precede&nbsp;the Rayleigh waves. &nbsp;The Love wave is =
a&nbsp;horizontal&nbsp;wave visible on the transverse channel. &nbsp;The =
Rayleigh wave is a vertical wave that is visible on the vertical and =
radial channels. &nbsp;Depending upon the orientation of a single =
channel horizontal instrument, and the&nbsp;ray path&nbsp;to the event, =
you could see both Love &amp; Rayleigh =
waves.</div><div><br></div><div>Bob Hancock =
&nbsp;</div><div><br></div><br><div><div>On May 28, 2009, at 2:07 PM, =
Gary Lindgren wrote:</div><br =
class=3D"Apple-interchange-newline"><blockquote type=3D"cite"><span =
class=3D"Apple-style-span" style=3D"border-collapse: separate; color: =
rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: =
normal; font-variant: normal; font-weight: normal; letter-spacing: =
normal; line-height: normal; orphans: 2; text-align: auto; text-indent: =
0px; text-transform: none; white-space: normal; widows: 2; word-spacing: =
0px; -webkit-border-horizontal-spacing: 0px; =
-webkit-border-vertical-spacing: 0px; =
-webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: =
auto; -webkit-text-stroke-width: 0; "><div lang=3D"EN-US" link=3D"blue" =
vlink=3D"purple"><div class=3D"Section1"><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif; ">That quake really came in =
strong on my Lehman. But I have a question, about 15 minutes after the P =
and S wave, the amplitude of the response just explodes. What are we =
seeing here, how do I explain this to others.<o:p></o:p></div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, =
sans-serif; ">Gary<o:p></o:p></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif; "><o:p>&nbsp;</o:p></div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, =
sans-serif; "><o:p>&nbsp;</o:p></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif; "><o:p>&nbsp;</o:p></div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, =
sans-serif; "><o:p>&nbsp;</o:p></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif; "><b><span style=3D"font-size: =
12pt; font-family: Arial, sans-serif; color: rgb(84, 141, 212); ">Gary =
Lindgren</span></b><b><span style=3D"font-size: 12pt; color: rgb(84, =
141, 212); "><o:p></o:p></span></b></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif; "><b><span style=3D"font-size: =
12pt; font-family: Arial, sans-serif; color: rgb(84, 141, 212); ">585 =
Lincoln Ave</span></b><b><span style=3D"font-size: 12pt; color: rgb(84, =
141, 212); "><o:p></o:p></span></b></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif; "><b><span style=3D"font-size: =
12pt; font-family: Arial, sans-serif; color: rgb(84, 141, 212); ">Palo =
Alto CA 94301</span></b><b><span style=3D"font-size: 12pt; color: =
rgb(84, 141, 212); "><o:p></o:p></span></b></div><div style=3D"margin-top:=
 0in; margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; =
font-size: 11pt; font-family: Calibri, sans-serif; =
">&nbsp;<o:p></o:p></div><div style=3D"margin-top: 0in; margin-right: =
0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: 11pt; =
font-family: Calibri, sans-serif; "><span style=3D"font-size: 10pt; =
font-family: Arial, sans-serif; =
">650-326-0655</span><o:p></o:p></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif; ">&nbsp;<o:p></o:p></div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, =
sans-serif; "><span style=3D"font-size: 10pt; font-family: Arial, =
sans-serif; "><a href=3D"http://www.blue-eagle-technologies.com/" =
style=3D"color: blue; text-decoration: underline; "><span style=3D"color: =
blue; ">www.blue-eagle-technologies.com</span></a>&nbsp;&nbsp;<span =
class=3D"Apple-converted-space">&nbsp;</span><span style=3D"color: red; =
">Check out Lastest Seismometer =
Reading</span></span><o:p></o:p></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif; "><span style=3D"font-size: =
10pt; font-family: Arial, sans-serif; "><a =
href=3D"http://www.cymonsplace.blogspot.com/" style=3D"color: blue; =
text-decoration: underline; "><span style=3D"color: blue; =
">cymonsplace.blogspot.com</span></a>&nbsp;<o:p></o:p></span></div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, =
sans-serif; "><span style=3D"font-size: 10pt; font-family: Arial, =
sans-serif; "><a href=3D"http://dtvtransitioninfo.blogspot.com/" =
style=3D"color: blue; text-decoration: underline; "><span style=3D"color: =
blue; =
">dtvtransitioninfo.blogspot.com</span></a>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;<span class=3D"Apple-converted-space">&nbsp;</span><span =
style=3D"color: red; ">Information on how to cope with the transition to =
DTV</span></span><o:p></o:p></div><div style=3D"margin-top: 0in; =
margin-right: 0in; margin-left: 0in; margin-bottom: 0.0001pt; font-size: =
11pt; font-family: Calibri, sans-serif; ">&nbsp;<o:p></o:p></div><div =
style=3D"margin-top: 0in; margin-right: 0in; margin-left: 0in; =
margin-bottom: 0.0001pt; font-size: 11pt; font-family: Calibri, =
sans-serif; =
"><o:p>&nbsp;</o:p></div></div></div></span></blockquote></div><br></body>=
</html>=

Subject: Re: Honduras Quake 5/28/09
From: ChrisAtUpw@.......
Date: Thu, 28 May 2009 17:28:41 EDT

 
In a message dated 28/05/2009, gel@................. writes:

But I  have a question, about 15 minutes after the P and S wave, the 
amplitude of the  response just explodes. What are we seeing here, how do I 
explain this to  others.


Hi Gary,
 
    These will be Love surface waves. 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML xmlns:o =3D "urn:schemas-microsoft-com:office:office"><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 28/05/2009, gel@................. writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>But I 
  have a question, about 15 minutes after the P and S wave, the amplitude=
 of the 
  response just explodes. What are we seeing here, how do I explain this=
 to 
  others.<o:p></o:p></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Gary,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;These will be Love surface waves. 
</DIV></FONT></BODY></HTML>

Subject: Re: Honduras Quake 5/28/09
From: Brett Nordgren  brett3nt@............. 
Date: Thu, 28 May 2009 17:26:29 -0400

Hi Gary,

Are they slow - 20 second period or so?  Sounds like the surface waves to 
me.  Fifteen minutes is about what we saw from the first P wave to the 
beginning of the surface waves.

Brett

At 02:07 PM 5/28/2009 -0700, you wrote:

>That quake really came in strong on my Lehman. But I have a question, 
>about 15 minutes after the P and S wave, the amplitude of the response 
>just explodes. What are we seeing here, how do I explain this to others.
>
>Gary
>
>


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Subject: RE: Honduras Quake 5/28/09
From: "Kareem Lanier"  system98765@............. 
Date: Thu, 28 May 2009 14:48:59 -0700

Question:

Since Rayleigh waves are vertical but vertical geophones are more designed
for vertical, higher frequency motions, would the geophone still pick up
these Rayleigh waves very well?

Also, in regard to the 20 second statement, does this mean that twenty
seconds pass before the second wave crest passes the sensor's location? What
does that look like on the seismogram? Seems like the record wouldn't
display much of a dramatic signature would it? Or would it display smooth
wavy lines?



-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Brett Nordgren
Sent: Thursday, May 28, 2009 2:26 PM
To: psn-l@..............
Subject: Re: Honduras Quake 5/28/09

Hi Gary,

Are they slow - 20 second period or so?  Sounds like the surface waves to
me.  Fifteen minutes is about what we saw from the first P wave to the
beginning of the surface waves.

Brett

At 02:07 PM 5/28/2009 -0700, you wrote:

>That quake really came in strong on my Lehman. But I have a question, 
>about 15 minutes after the P and S wave, the amplitude of the response 
>just explodes. What are we seeing here, how do I explain this to others.
>
>Gary
>
>


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Subject: Re: Honduras Quake 5/28/09
From: ChrisAtUpw@.......
Date: Thu, 28 May 2009 18:21:00 EDT

In a message dated 28/05/2009, system98765@............. writes:

Since  Rayleigh waves are vertical but vertical geophones are more designed
for  vertical, higher frequency motions, would the geophone still pick up
these  Rayleigh waves very well?
Hi Gary,
 
    This depends on the resonant frequency of your  geophone, the frequency 
of the wave and the amplifier characteristics. A 1  Hz wave on a 4.5 Hz 
geophone will be (1/4.5)^2 down in amplitude = 1/20.25. 
    A 20 second wave will be (1/20*4.5)^2 down in  amplitude = 1/8,100 so 
the waves would have to be huge to show up at all. 
    If you added a period compensating amplifier from  4.5 to 0.5 Hz, the 
20 second wave would be 1/100 down in amplitude, so you  might well see it. A 
1 Hz wave would be at full amplitude.

Also, in  regard to the 20 second statement, does this mean that twenty
seconds pass  before the second wave crest passes the sensor's location? 
    Correct.

What  does that look like on the seismogram? Seems like the record wouldn't 
display  much of a dramatic signature would it? Or would it display smooth 
wavy  lines?
    It usually looks like a fairly smooth wave 3 times  each minute, but 
you also get interference effects / humps /  beats and  noise.
 
    Regards,
 
    Chris Chapman




<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>In a message dated 28/05/2009, system98765@............. writes:</DIV=
>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>Since 
  Rayleigh waves are vertical but vertical geophones are more designed<BR>=
for 
  vertical, higher frequency motions, would the geophone still pick up<BR>=
these 
  Rayleigh waves very well?</FONT></BLOCKQUOTE>
<DIV>Hi Gary,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;This depends on the resonant frequency of you=
r 
geophone, the frequency of the wave&nbsp;and the amplifier characteristics=
.. A 1 
Hz wave on a 4.5 Hz geophone will be (1/4.5)^2 down in amplitude =3D 1/20.=
25. 
</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;A 20 second wave will be (1/20*4.5)^2 down in=
 
amplitude =3D 1/8,100 so the waves would have to be huge to show up at all=
.. </DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;If you added a period compensating amplifier=
 from 
4.5&nbsp;to 0.5 Hz, the 20 second wave would be 1/100 down in amplitude,=
 so you 
might well see it. A 1 Hz wave would be at full amplitude.</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>Also, in 
  regard to the 20 second statement, does this mean that twenty<BR>seconds=
 pass 
  before the second wave crest passes the sensor's location? </FONT></BLOC=
KQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Correct.</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>What 
  does that look like on the seismogram? Seems like the record wouldn't di=
splay 
  much of a dramatic signature would it? Or would it display smooth wavy=
 
  lines?</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;It usually looks like a fairly smooth wave 3=
 times 
each minute, but you also get interference effects / humps / &nbsp;beats=
 and 
noise.</DIV>
<DIV>&nbsp;</DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0=
00000 
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</FONT></DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0=
00000 
size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0=
00000 
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV>
<DIV><BR></DIV></FONT>
<DIV></DIV>
<DIV>&nbsp;</DIV></FONT></BODY></HTML>

Subject: Re: Honduras quake 5/28 and winsdr problem
From: Barry Lotz  barry_lotz@............. 
Date: Thu, 28 May 2009 18:20:24 -0700 (PDT)

Thomas
I'm not sure if it's the same but , I am using Larry's winsdr and winquake. I am saving the channels as GIF files. Winsdr replayed the Honduras event well but when I tried to save and play in winquake I only get the first ~ 30 minutes regardless of the save time I input in winsdr. I restarted winsdr after the event and had no problem recording and saving the Jalisco events. Does anyone know how I can save ~100 min of the Honduras event given what I said above .... Larry?
Regards
Barry


--- On Thu, 5/28/09, Thomas Dick <dickthomas01@.............> wrote:

From: Thomas Dick <dickthomas01@.............>
Subject: Honduras quake 5/28
To: "psn-l@.............." <psn-l@..............>
Date: Thursday, May 28, 2009, 4:37 AM

Anybody else having trouble using USGS data and finding P off by as much as 30 seconds?
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Public Seismic Network Mailing List (PSN-L)

<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Thomas<br>I'm not sure if it's the same but , I am using Larry's winsdr and winquake. I am saving the channels as GIF files. Winsdr replayed the Honduras event well but when I tried to save and play in winquake I only get the first ~ 30 minutes regardless of the save time I input in winsdr. I restarted winsdr after the event and had no problem recording and saving the Jalisco events. Does anyone know how I can save ~100 min of the Honduras event given what I said above .... Larry?<br>Regards<br>Barry<br><br><br>--- On <b>Thu, 5/28/09, Thomas Dick <i>&lt;dickthomas01@.............&gt;</i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: Thomas Dick &lt;dickthomas01@.............&gt;<br>Subject: Honduras quake 5/28<br>To: "psn-l@.............." &lt;psn-l@..............&gt;<br>Date: Thursday,
 May 28, 2009, 4:37 AM<br><br><div class="plainMail">Anybody else having trouble using USGS data and finding P off by as much as 30 seconds?<br>__________________________________________________________<br><br>Public Seismic Network Mailing List (PSN-L)<br><br>To leave this list email <a ymailto="mailto:PSN-L-REQUEST@SEISMICNET.COM" href="/mc/compose?to=PSN-L-REQUEST@SEISMICNET.COM">PSN-L-REQUEST@SEISMICNET.COM</a> with the body of the message (first line only): unsubscribe<br>See <a href="http://www.seismicnet.com/maillist.html" target="_blank">http://www.seismicnet.com/maillist.html</a> for more information.<br></div></blockquote></td></tr></table>

Subject: RE: Honduras Quake 5/28/09
From: Brett Nordgren  brett3nt@............. 
Date: Thu, 28 May 2009 20:49:14 -0400

Kareem,

Here's a waveform of that quake from a good broadband vertical in Southern 
California.

http://bnordgren.org/seismo/090528.083000.bhz-ph.psn.gif

The surface waves are usually around 20 seconds from each peak to the next 
and they definitely show up nicely on the broadband, though I wouldn't 
expect an ordinary geophone to have much sensitivity down at 0.05 Hz.   As 
you can see, the S wave is fairly weak, as is usual with a vertical.

Regards,
Brett

At 02:48 PM 5/28/2009 -0700, you wrote:
>Question:
>
>Since Rayleigh waves are vertical but vertical geophones are more designed
>for vertical, higher frequency motions, would the geophone still pick up
>these Rayleigh waves very well?
>
>Also, in regard to the 20 second statement, does this mean that twenty
>seconds pass before the second wave crest passes the sensor's location? What
>does that look like on the seismogram? Seems like the record wouldn't
>display much of a dramatic signature would it? Or would it display smooth
>wavy lines?


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Subject: Re: Honduras quake 5/28 and winsdr problem
From: Thomas Dick  dickthomas01@............. 
Date: Thu, 28 May 2009 21:32:32 -0500

Thanks, Barry, but my problem was operator error. I had transposed a 
number in the coordinates. I got up and tried to work without two cups 
of coffee.. I use the same software as you but have NOT had an occasion 
to record over about 80 minutes...sorry can't help you.
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Subject: Re: Honduras quake 5/28 and winsdr problem
From: Barry Lotz  barry_lotz@............. 
Date: Thu, 28 May 2009 19:50:53 -0700 (PDT)

Thomas
I looked further. There appears to be a hole in my data between the P and S wave arrivals. I resolved to save the event starting just before the S wave arrival. "K sara sara"
Barry

--- On Thu, 5/28/09, Thomas Dick <dickthomas01@.............> wrote:

From: Thomas Dick <dickthomas01@.............>
Subject: Re: Honduras quake 5/28 and winsdr problem
To: psn-l@..............
Date: Thursday, May 28, 2009, 7:32 PM

Thanks, Barry, but my problem was operator error. I had transposed a number in the coordinates. I got up and tried to work without two cups of coffee.. I use the same software as you but have NOT had an occasion to record over about 80 minutes...sorry can't help you.
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<table cellspacing="0" cellpadding="0" border="0" ><tr><td valign="top" style="font: inherit;">Thomas<br>I looked further. There appears to be a hole in my data between the P and S wave arrivals. I resolved to save the event starting just before the S wave arrival. "K sara sara"<br>Barry<br><br>--- On <b>Thu, 5/28/09, Thomas Dick <i>&lt;dickthomas01@.............&gt;</i></b> wrote:<br><blockquote style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: Thomas Dick &lt;dickthomas01@.............&gt;<br>Subject: Re: Honduras quake 5/28 and winsdr problem<br>To: psn-l@..............<br>Date: Thursday, May 28, 2009, 7:32 PM<br><br><div class="plainMail">Thanks, Barry, but my problem was operator error. I had transposed a number in the coordinates. I got up and tried to work without two cups of coffee.. I use the same software as you but have NOT had an occasion to record over about 80 minutes...sorry can't help
 you.<br>__________________________________________________________<br><br>Public Seismic Network Mailing List (PSN-L)<br><br>To leave this list email <a ymailto="mailto:PSN-L-REQUEST@SEISMICNET.COM" href="/mc/compose?to=PSN-L-REQUEST@SEISMICNET.COM">PSN-L-REQUEST@SEISMICNET.COM</a> with the body of the message (first line only): unsubscribe<br>See <a href="http://www.seismicnet.com/maillist.html" target="_blank">http://www.seismicnet.com/maillist.html</a> for more information.<br></div></blockquote></td></tr></table>

Subject: Honduras event
From: Tangazazen@.......
Date: Fri, 29 May 2009 03:58:31 EDT

Hi All,
 
    Is there anyone out there operating a tilt meter?
The Honduras event was detected by the tilt meter as a 12.5 to 15 minute  
period oscillation, about 45 minutes after the arrival of the seismic  wave.
 
 
Martin
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6001.18226" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
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bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>Hi All,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp; Is there anyone out there operating a tilt meter?<=
/DIV>
<DIV>The Honduras event was detected by the tilt meter as a 12.5 to 15 min=
ute 
period oscillation, about 45 minutes after the arrival of the seismic 
wave.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>Martin</DIV></FONT></BODY></HTML>

Subject: Re: Honduras quake 5/28 and winsdr problem
From: Thomas Dick  dickthomas01@............. 
Date: Fri, 29 May 2009 06:43:15 -0500

Barry  ... back up your data .... that hard drive is telling you something
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Subject: Re: Honduras quake 5/28 and winsdr problem
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Fri, 29 May 2009 12:16:32 +0000

Hi

Your hard drive might be on a path to destrouction, due to old age or a
factory fault.

I recomennd that you replace it.

Regards.
J=F3n Fr=EDmann.

On fim, 2009-05-28 at 19:50 -0700, Barry Lotz wrote:
> Thomas
> I looked further. There appears to be a hole in my data between the P
> and S wave arrivals. I resolved to save the event starting just before
> the S wave arrival. "K sara sara"
> Barry
>=20
> --- On Thu, 5/28/09, Thomas Dick <dickthomas01@.............> wrote:
>        =20
>         From: Thomas Dick <dickthomas01@.............>
>         Subject: Re: Honduras quake 5/28 and winsdr problem
>         To: psn-l@..............
>         Date: Thursday, May 28, 2009, 7:32 PM
>        =20
>         Thanks, Barry, but my problem was operator error. I had
>         transposed a number in the coordinates. I got up and tried to
>         work without two cups of coffee.. I use the same software as
>         you but have NOT had an occasion to record over about 80
>         minutes...sorry can't help you.
>         __________________________________________________________
>        =20
>         Public Seismic Network Mailing List (PSN-L)
>        =20
>         To leave this list email PSN-L-REQUEST@.............. with the
>         body of the message (first line only): unsubscribe
>         See http://www.seismicnet.com/maillist.html for more
>         information.
>        =20
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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Subject: RE: Honduras Quake 5/28/09
From: "David Saum"  DSaum@............ 
Date: Fri, 29 May 2009 08:51:04 -0400 (EDT)

> Subject: RE: Honduras Quake 5/28/09
> From:    "Kareem Lanier" <system98765@.............>
> Date:    Thu, 28 May 2009 14:48:59 -0700
>
> Question:
>
> Since Rayleigh waves are vertical but vertical geophones are more designed
> for vertical, higher frequency motions, would the geophone still pick up
> these Rayleigh waves very well?

It is a common misconception that 4.5 Hz geophones can not pick
up seismic signals below 0.1 Hz, or that they need special
post processing to do so.

I often pick up 0.05 Hz or lower signals from strong teleseismic events
with my horizontal 4.5 Hz geophone systems that do not have any
spectral emphasis processing on the lower frequencies

Here is one of my 4.5 Hz horizontal geophone
teleseismic detections:

2003 January 20 08:43:06.0 UTC
Magnitude 7.2 - SOLOMON ISLANDS: 13,500 km from Bailey's Crossroads, VA

spectra from horizontal 4.5 hz geophone with no filtering
http://www.infiltec.com/seismo/030120f.gif

Amaseis 24Hr Helicorder display with 0.1Hz low-pass
http://www.infiltec.com/seismo/030120h.gif

display of time data with 0.1 Hz low-pass
http://www.infiltec.com/seismo/030122w.gif

for more examples, see
http://www.infiltec.com/seismo/inf-qm45.htm

It helps to use a low-noise amplifier with auto-zero
to reduce 1/f noise, do 16 bits or better A/D to preserve
your dynamic range, to have a multi-pole low pass
Bessel filter for antialiasing, and to sample fast
enough to allow your antialiasing to keep your noise
spectra from folding back on itself. All of that will
lower your background noise in the lower frequency
bands of seismic interest.

Dave
http://www.infiltec.com/seismo
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Subject: Re: Honduras Quake / geophones
From: ChrisAtUpw@.......
Date: Fri, 29 May 2009 14:33:09 EDT

 
In a message dated 29/05/2009, DSaum@............ writes:

>  Since Rayleigh waves are vertical but vertical geophones are more  
designed for vertical, higher >frequency motions, would the geophone  still pick 
up these Rayleigh waves very well?

It is a common  misconception that 4.5 Hz geophones can not pick up seismic 
signals below 0.1  Hz, or that they need special post processing to do so.

I often pick up  0.05 Hz or lower signals from strong teleseismic events 
with my horizontal 4.5  Hz geophone systems that do not have any spectral 
emphasis processing on the  lower frequencies



Hi Dave,
 
    Sure you can occasionally pick up 20 second waves  on a 4.5 Hz 
geophone, but the sensitivity is a factor of x8,100 down.  However, most of us want 
to be able to sense the long period waves all the  time. It is relatively 
difficult to extend the period of a velocity sensor by  more than x10. You can 
get more, but you need a very low noise amplifier. I  extend the period of 
4.5 Hz geophones down to 0.5 Hz to pick up P and S waves  better.
 
    If you simply change your technology to Piezo  sensors 102-1170-ND @ US 
$1.62 instead of 4.5 Hz geophones, you can do this  fairly easily. You do 
need to make a suitable FET input amplifier; the  piezo disk needs to be kept 
dry and at a fairly stable temperature. I use a  honey jar with a metal 
lid, a moulded rubber seal and a sachet of silica gel. I  stick a PCB disk with 
soldered electrical feed through pins over a  hole in the lid, using two 
part acrylic adhesive. The amplifier is mounted  inside the lid of the jar, to 
keep it dry. The input impedance is about 50 M  Ohms.
 
    Regards,
 
    Chris Chapman
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 29/05/2009, DSaum@............ writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>&gt; 
  Since Rayleigh waves are vertical but vertical geophones are more 
  designed&nbsp;for vertical, higher &gt;frequency motions, would the geop=
hone 
  still pick up&nbsp;these Rayleigh waves very well?<BR><BR>It is a common=
 
  misconception that 4.5 Hz geophones can not pick up seismic signals belo=
w 0.1 
  Hz, or that they need special post processing to do so.<BR><BR>I often=
 pick up 
  0.05 Hz or lower signals from strong teleseismic events with my horizont=
al 4.5 
  Hz geophone systems that do not have any spectral emphasis processing on=
 the 
  lower frequencies<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Dave,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Sure you can occasionally pick up 20 second=
 waves 
on a 4.5 Hz geophone, but the sensitivity is&nbsp;a factor of x8,100 down.=
 
However, most of us want to be able to sense the long period waves&nbsp;al=
l the 
time. It is relatively difficult to extend the period of a velocity sensor=
 by 
more than x10. You can get more, but you need a&nbsp;very low noise amplif=
ier. I 
extend the period of 4.5 Hz geophones down to 0.5 Hz to pick up P and S wa=
ves 
better.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;If you simply change your technology to Piezo=
 
sensors 102-1170-ND @ US $1.62 instead of 4.5 Hz geophones, you can do thi=
s 
fairly easily.&nbsp;You do need to make a suitable FET input&nbsp;amplifie=
r; the 
piezo disk needs to be kept&nbsp;dry and at a fairly stable temperature.=
 I use a 
honey jar with a metal lid, a moulded rubber seal and a sachet of silica=
 gel. I 
stick&nbsp;a PCB disk with soldered electrical&nbsp;feed through pins over=
 a 
hole in the lid, using two part acrylic adhesive.&nbsp;The amplifier is mo=
unted 
inside the lid of the jar, to keep it dry. The input impedance is about 50=
 M 
Ohms.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV>
<DIV>&nbsp;</DIV></FONT></BODY></HTML>

Subject: Earthquake in Iceland
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Fri, 29 May 2009 21:57:22 +0000

Hi all

At 21:33 on the 29th May 2009, there was a earthquake of size Mb4,6 -
5,0 in Iceland.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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Subject: Re: Did I get 12 second period ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Sat, 30 May 2009 00:56:56 +0000

Hi all

Here is a signal that I did get tonight with a 12 second period lehman
type sensor. I have changed the setup a bit from previus setup, this
appears to give me a clear signal. The magnets are now aligned with the
coil, so the magnetic field is now stable when the coil moves. That way
I got rid of increse, decrese effect of the magent in regards to the
coil. The setup is not complete, as I need correct magnets. But I have
setup a test magnets for the time being. The first resaults are good.
The sensor has a high peak around 12 seconds, but is able to detect
signal up to 0.1Hz, as can been seen on this earthquake detection. It
goes as low as 20 seconds I think.=20

This is work in progress, I am going to get rare-earth magnets next
month to make the final improvement to my lehman seismomter.

Here is the signal. This earthquake was Mw4,92 in size at the distance
of 180 km.
http://seismicnet.com/cgi-dos/makegif.exe?/quakes/0905/090529.213318.hvtlhn=
..psn

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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Public Seismic Network Mailing List (PSN-L)


Subject: Level of garden gate style horizontal seismometers
From: "Geoffrey"  gmvoeth@........... 
Date: Sat, 30 May 2009 14:31:29 -0700

Hello PSN;

Just out of curiosity has any of you guys with
those garden gate seismometers ever put one
of these little plastic levels on the lever
to see just how far off level it is at
10 or 20 seconds. I mean here like 1/2,
1/4 or so a bubble across the line
if you understand what I mean here ?

Maybe it is not even crossing the line
but you can see possibly its off level
and just touching the reference line ?

They got these fish eye levels that just tell you
the horizontal and I thought that that might help set
up your period ??

Has anyone ever seen a cheap calibrated level
that will tell you fractions of a degree
off level ?

Metrology, I have always thought, would be
a good profession to be in. :-)

Any comments ?

geoff

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Honduras Quake / geophones
From: "David Saum"  DSaum@............ 
Date: Sat, 30 May 2009 18:49:19 -0400 (EDT)

> Subject: Re: Honduras Quake / geophones
> From:    ChrisAtUpw@.......
> Date:    Fri, 29 May 2009 14:33:09 EDT

>     If you simply change your technology to Piezo  sensors 102-1170-ND @
> US
> $1.62 instead of 4.5 Hz geophones, you can do this  fairly easily. You do
> need to make a suitable FET input amplifier; the  piezo disk needs to be
> kept
> dry and at a fairly stable temperature. I use a  honey jar with a metal
> lid, a moulded rubber seal and a sachet of silica gel. I  stick a PCB disk
> with
> soldered electrical feed through pins over a  hole in the lid, using two
> part acrylic adhesive. The amplifier is mounted  inside the lid of the
> jar, to
> keep it dry. The input impedance is about 50 M  Ohms.

Hi Chris

Sounds interesting in theory, but how well does it actually work?

Do you have any data/spectra from your piezo device that shows it
picks up teleseismic events as well as a my horizontal 4.5 Hz geophone?

Dave


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Geophones / Piezo sensors
From: ChrisAtUpw@.......
Date: Sat, 30 May 2009 23:49:30 EDT

 
In a message dated 30/05/2009, DSaum@............ writes:

Hi  Chris
Sounds interesting in theory, but how well does it actually  work?
Do you have any data / spectra from your piezo device that shows  it
picks up teleseismic events as well as a my horizontal 4.5 Hz  geophone?
Dave



Hi Dave,
 
    There are more sensor construction details and  circuits at 
_http://www.jclahr.com/science/psn/chapman/piezo/index.html_ 
(http://www.jclahr.com/science/psn/chapman/piezo/index.html)  Please  Note that the stated circuit 
components and their values are critical to  success.
 
    The device acts as an accelerometer, but the  internal noise of 
capacitor is very low and the voltage sensitivity to bending  stresses is high.
 
    I initially extended the period of my 4.5 Hz  geophones by x10 to 0.5 
Hz using a modified Roberts circuit and it worked fine.  See 
_http://www.jclahr.com/science/psn/roberts/index.html_ 
(http://www.jclahr.com/science/psn/roberts/index.html)  The  increased response to teleseismic P and S waves is 
very evident. The  modifications were to effectively add a high pass function 
at about 0.3 Hz  to remove most of the 1/f  VLF noise, that the original 
circuit displays  only too well. You can use CAZ opamps for the input stages 
($$), but a filter  also reduces 6 second microseism noise, which is also 
quite obvious. I do not  find microseisms particularly interesting.
 
    Lennartz put a negative input impedance amplifier  onto 4.5 or 2 Hz 
geophones and amplify the current required to keep the mass  stationary. They 
can increase the response period to 20 seconds this way,  but you need 
careful temperature compensation and a very low noise  amplifier. See 
_http://www.lennartz-electronic.de/Pages/Seismology/Seismometers/Seismometers.html_ 
(http://www.lennartz-electronic.de/Pages/Seismology/Seismometers/Seismometers.htm
l)  The  NoeMax triaxial sensor used in French schools appears to be 
similar  but they are not exactly cheap either. See 
_http://www.agecodagis.com/WebData/Documentation/Commercial/NoeMax/NoeMax.pdf_ 
(http://www.agecodagis.com/WebData/Documentation/Commercial/NoeMax/NoeMax.pdf)    The apparent output 
response below 0.05 Hz concerns me and it crosses the NHNM  high ground noise 
plot. Extending 4.5 Hz geophones to 20 seconds is a factor of  x90. This 
would be below the noise level of the 'standard' seismic amplifier  that I 
used. 
 
    I first made a very simple piezo detector by  sticking a disk onto two 
ridges of adhesive silicone rubber spaced 1.25" apart  on a backing plate. 
This silicone adhesive does NOT smell of acetic acid /  vinegar. I then stuck 
a brass rod parallel to the ridges on the top centre of  the disk. I used a 
unity gain FET amplifier to provide a signal for the same  amplifier used 
for observing the geophone signal. The piezo signal for the  background noise 
was about 5x that of the geophone, measured on an  oscilloscpe. I then 
tried to optimise the design and extend the period as  far as practicable. My 
sensors do work fine to well below 1 Hz. I do  not know about yours, Dave.
 
    Regards,
 
    Chris Chapman
 
 
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 30/05/2009, DSaum@............ writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>Hi 
  Chris<BR>Sounds interesting in theory, but how well does it actually 
  work?<BR>Do you have any data / spectra from your piezo device that show=
s 
  it<BR>picks up teleseismic events as well as a my horizontal 4.5 Hz 
  geophone?<BR>Dave<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Dave,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;There are more sensor construction details an=
d 
circuits at <A 
href=3D"http://www.jclahr.com/science/psn/chapman/piezo/index.html">http:/=
/www.jclahr.com/science/psn/chapman/piezo/index.html</A>&nbsp;Please 
Note that the stated circuit components&nbsp;and their values are critical=
 to 
success.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;The device acts as an accelerometer, but the=
 
internal noise of capacitor is very low and the voltage sensitivity to ben=
ding 
stresses is high.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I initially extended the period of my 4.5 Hz=
 
geophones by x10 to 0.5 Hz using a modified Roberts circuit and it worked=
 fine. 
See <A 
href=3D"http://www.jclahr.com/science/psn/roberts/index.html">http://www.j=
clahr.com/science/psn/roberts/index.html</A>&nbsp;The 
increased response to teleseismic P and S waves is very evident. The 
modifications were to effectively add a&nbsp;high pass function at about=
 0.3 Hz 
to remove most of the 1/f&nbsp; VLF noise, that the original circuit displ=
ays 
only too well. You can use CAZ opamps for the input stages ($$), but a fil=
ter 
also reduces 6 second microseism noise, which is also quite obvious. I do=
 not 
find microseisms particularly interesting.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Lennartz put a negative input impedance ampli=
fier 
onto 4.5 or 2 Hz geophones and amplify the current required to keep the ma=
ss 
stationary. They can increase the response period&nbsp;to 20 seconds this=
 way, 
but you need&nbsp;careful temperature compensation and a very low noise 
amplifier.&nbsp;See <A 
href=3D"http://www.lennartz-electronic.de/Pages/Seismology/Seismometers/Se=
ismometers.html">http://www.lennartz-electronic.de/Pages/Seismology/Seismo=
meters/Seismometers.html</A>&nbsp;The 
NoeMax triaxial&nbsp;sensor used in French schools appears to be&nbsp;simi=
lar 
but they are not exactly cheap either. See <A 
href=3D"http://www.agecodagis.com/WebData/Documentation/Commercial/NoeMax/=
NoeMax.pdf">http://www.agecodagis.com/WebData/Documentation/Commercial/Noe=
Max/NoeMax.pdf</A>&nbsp; 
The apparent output response below 0.05 Hz concerns me and it crosses the=
 NHNM 
high ground noise plot. Extending 4.5 Hz geophones to 20 seconds is a fact=
or of 
x90. This would be below the noise level of the 'standard' seismic amplifi=
er 
that I used.&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I first made a very simple piezo detector by=
 
sticking a disk onto two ridges of adhesive silicone rubber spaced 1.25"=
 apart 
on a backing plate. This silicone adhesive does NOT smell of acetic acid=
 / 
vinegar. I then stuck a brass rod parallel to the ridges on the top centre=
 of 
the disk. I used a unity gain FET amplifier to provide a signal for the sa=
me 
amplifier used for observing the geophone signal. The piezo signal for the=
 
background noise was about 5x that of the geophone, measured on an 
oscilloscpe.&nbsp;I then tried to optimise the design and extend the perio=
d as 
far as practicable. My sensors&nbsp;do work fine to well below 1 Hz.&nbsp;=
I do 
not know about&nbsp;yours, Dave.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV></FONT></BODY></HTML>

Subject: Re: Level of garden gate style horizontal seismometers
From: Charles Patton  charles.r.patton@........ 
Date: Sat, 30 May 2009 21:00:23 -0700

Geoff,
The level of the arm is unimportant.  The key is the plane of the arc 
described by the movement of the center of gravity of the garden gate 
(nominally the weight on the arm but with heavy arms, significantly 
closer to the pivot than the center of the weight.  So a more useful 
measure is how close to vertical the pivots are, but this is also not 
exact as the pivot geometry enters into the calculation.  See:
http://www.myeclectic.info/SeismoPivots/seismopivots.htm
for a longer discussion on this subject along with formulas of the 
trajectory.
Regards,
Charles Patton

Geoffrey wrote:
> Hello PSN;
> 
> Just out of curiosity has any of you guys with
> those garden gate seismometers ever put one
> of these little plastic levels on the lever
> to see just how far off level it is at
> 10 or 20 seconds. I mean here like 1/2,
> 1/4 or so a bubble across the line
> if you understand what I mean here ?
> 
> Maybe it is not even crossing the line
> but you can see possibly its off level
> and just touching the reference line ?
> 
> They got these fish eye levels that just tell you
> the horizontal and I thought that that might help set
> up your period ??
> 
> Has anyone ever seen a cheap calibrated level
> that will tell you fractions of a degree
> off level ?
> 
> Metrology, I have always thought, would be
> a good profession to be in. :-)
> 
> Any comments ?
> 
> geoff
> 
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with the body of 
> the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: RE: Geophones / Piezo sensors
From: "Steve Hammond"  shammon1@............. 
Date: Sat, 30 May 2009 21:31:07 -0700

This is a really old idea. It's funny how things keep coming back around. In
1991 Bob Ogborn of San Jose and later Texas built a bunch of these types of
devices. They are best for short periods and local events. His design was
simple. He used the Piezo butterfly fan from the Apple computer and encased
it in a short length of PVC pipe with two PVC caps. He drilled a hole in one
cap for the wires to exit and filled the device with oil for damping and
then sealed it up with glue. They worked well enough but they can generate a
lot of current if they are tapped too hard so he had to protect the circuit
with two clamping diodes or the current would fry the electronics. 

Regards, Steve Hammond PSN San Jose, Aptos CA.    

 

From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of ChrisAtUpw@.......
Sent: Saturday, May 30, 2009 8:50 PM
To: psn-l@..............
Subject: Re: Geophones / Piezo sensors

 

In a message dated 30/05/2009, DSaum@............ writes:

Hi Chris
Sounds interesting in theory, but how well does it actually work?
Do you have any data / spectra from your piezo device that shows it
picks up teleseismic events as well as a my horizontal 4.5 Hz geophone?
Dave

Hi Dave,

 

    There are more sensor construction details and circuits at
http://www.jclahr.com/science/psn/chapman/piezo/index.html Please Note that
the stated circuit components and their values are critical to success.

 

    The device acts as an accelerometer, but the internal noise of capacitor
is very low and the voltage sensitivity to bending stresses is high.

 

    I initially extended the period of my 4.5 Hz geophones by x10 to 0.5 Hz
using a modified Roberts circuit and it worked fine. See
http://www.jclahr.com/science/psn/roberts/index.html The increased response
to teleseismic P and S waves is very evident. The modifications were to
effectively add a high pass function at about 0.3 Hz to remove most of the
1/f  VLF noise, that the original circuit displays only too well. You can
use CAZ opamps for the input stages ($$), but a filter also reduces 6 second
microseism noise, which is also quite obvious. I do not find microseisms
particularly interesting.

 

    Lennartz put a negative input impedance amplifier onto 4.5 or 2 Hz
geophones and amplify the current required to keep the mass stationary. They
can increase the response period to 20 seconds this way, but you need
careful temperature compensation and a very low noise amplifier. See
http://www.lennartz-electronic.de/Pages/Seismology/Seismometers/Seismometers
..html The NoeMax triaxial sensor used in French schools appears to be
similar but they are not exactly cheap either. See
http://www.agecodagis.com/WebData/Documentation/Commercial/NoeMax/NoeMax.pdf
The apparent output response below 0.05 Hz concerns me and it crosses the
NHNM high ground noise plot. Extending 4.5 Hz geophones to 20 seconds is a
factor of x90. This would be below the noise level of the 'standard' seismic
amplifier that I used. 

 

    I first made a very simple piezo detector by sticking a disk onto two
ridges of adhesive silicone rubber spaced 1.25" apart on a backing plate.
This silicone adhesive does NOT smell of acetic acid / vinegar. I then stuck
a brass rod parallel to the ridges on the top centre of the disk. I used a
unity gain FET amplifier to provide a signal for the same amplifier used for
observing the geophone signal. The piezo signal for the background noise was
about 5x that of the geophone, measured on an oscilloscpe. I then tried to
optimise the design and extend the period as far as practicable. My sensors
do work fine to well below 1 Hz. I do not know about yours, Dave.

 

    Regards,

 

    Chris Chapman

 

 

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<div class=3DSection1>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>This is a really old idea. It&#8217;s funny how things =
keep coming
back around. In 1991 Bob Ogborn of San Jose and later Texas built a =
bunch of
these types of devices. They are best for short periods and local =
events. His
design was simple. He used the Piezo butterfly fan from the Apple =
computer and
encased it in a short length of PVC pipe with two PVC caps. He drilled a =
hole
in one cap for the wires to exit and filled the device with oil for =
damping and
then sealed it up with glue. They worked well enough but they can =
generate a
lot of current if they are tapped too hard so he had to protect the =
circuit
with two clamping diodes or the current would fry the electronics. =
<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Regards, Steve Hammond PSN San Jose, Aptos CA. =
&nbsp;&nbsp;&nbsp;<o:p></o:p></span></p>

<p class=3DMsoNormal><span =
style=3D'font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p>&nbsp;</o:p></span></p>

<div>

<div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt =
0in 0in 0in'>

<p class=3DMsoNormal><b><span =
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span>=
</b><span
style=3D'font-size:10.0pt;font-family:"Tahoma","sans-serif"'>
psn-l-request@.............. [mailto:psn-l-request@............... <b>On =
Behalf
Of </b>ChrisAtUpw@.......<br>
<b>Sent:</b> Saturday, May 30, 2009 8:50 PM<br>
<b>To:</b> psn-l@..............<br>
<b>Subject:</b> Re: Geophones / Piezo sensors<o:p></o:p></span></p>

</div>

</div>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>In a message dated 30/05/2009, DSaum@............ =
writes:<o:p></o:p></span></p>

</div>

<blockquote style=3D'border:none;border-left:solid blue =
1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-bottom:5.0pt'>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Hi Chris<br>
Sounds interesting in theory, but how well does it actually work?<br>
Do you have any data / spectra from your piezo device that shows it<br>
picks up teleseismic events as well as a my horizontal 4.5 Hz =
geophone?<br>
Dave<o:p></o:p></span></p>

</blockquote>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Hi Dave,<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;There are more sensor construction =
details
and circuits at <a
href=3D"http://www.jclahr.com/science/psn/chapman/piezo/index.html">http:=
//www.jclahr.com/science/psn/chapman/piezo/index.html</a>&nbsp;Please
Note that the stated circuit components&nbsp;and their values are =
critical to
success.<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;The device acts as an =
accelerometer, but
the internal noise of capacitor is very low and the voltage sensitivity =
to
bending stresses is high.<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;I initially extended the period of =
my 4.5
Hz geophones by x10 to 0.5 Hz using a modified Roberts circuit and it =
worked
fine. See <a =
href=3D"http://www.jclahr.com/science/psn/roberts/index.html">http://www.=
jclahr.com/science/psn/roberts/index.html</a>&nbsp;The
increased response to teleseismic P and S waves is very evident. The
modifications were to effectively add a&nbsp;high pass function at about =
0.3 Hz
to remove most of the 1/f&nbsp; VLF noise, that the original circuit =
displays
only too well. You can use CAZ opamps for the input stages ($$), but a =
filter
also reduces 6 second microseism noise, which is also quite obvious. I =
do not
find microseisms particularly interesting.<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;Lennartz put a negative input =
impedance
amplifier onto 4.5 or 2 Hz geophones and amplify the current required to =
keep
the mass stationary. They can increase the response period&nbsp;to 20 =
seconds
this way, but you need&nbsp;careful temperature compensation and a very =
low
noise amplifier.&nbsp;See <a
href=3D"http://www.lennartz-electronic.de/Pages/Seismology/Seismometers/S=
eismometers.html">http://www.lennartz-electronic.de/Pages/Seismology/Seis=
mometers/Seismometers.html</a>&nbsp;The
NoeMax triaxial&nbsp;sensor used in French schools appears to =
be&nbsp;similar
but they are not exactly cheap either. See <a
href=3D"http://www.agecodagis.com/WebData/Documentation/Commercial/NoeMax=
/NoeMax.pdf">http://www.agecodagis.com/WebData/Documentation/Commercial/N=
oeMax/NoeMax.pdf</a>&nbsp;
The apparent output response below 0.05 Hz concerns me and it crosses =
the NHNM
high ground noise plot. Extending 4.5 Hz geophones to 20 seconds is a =
factor of
x90. This would be below the noise level of the 'standard' seismic =
amplifier
that I used.&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;I first made a very simple piezo =
detector
by sticking a disk onto two ridges of adhesive silicone rubber spaced
1.25&quot; apart on a backing plate. This silicone adhesive does NOT =
smell of
acetic acid / vinegar. I then stuck a brass rod parallel to the ridges =
on the
top centre of the disk. I used a unity gain FET amplifier to provide a =
signal
for the same amplifier used for observing the geophone signal. The piezo =
signal
for the background noise was about 5x that of the geophone, measured on =
an
oscilloscpe.&nbsp;I then tried to optimise the design and extend the =
period as
far as practicable. My sensors&nbsp;do work fine to well below 1 =
Hz.&nbsp;I do
not know about&nbsp;yours, Dave.<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;Regards,<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

<div>

<p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>&nbsp;<o:p></o:p></span></p>

</div>

</div>

</body>

</html>

Subject: optimal position of magnetic dampter
From: "Robert O. Green"  rog@.......... 
Date: Sun, 31 May 2009 07:08:49 -0700

Chris et al.,

What is the thinking on the optimal position of the magnetic damper (MD) 
along the lower boom?

It seem by shifting the MD position towards or away from the lower pivot 
one can tune the damping strength.

Rob

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Geophones / Piezo sensors
From: "David Saum"  DSaum@............ 
Date: Sun, 31 May 2009 10:38:44 -0400 (EDT)

> Subject: Re: Geophones / Piezo sensors
> From:    ChrisAtUpw@.......
> Date:    Sat, 30 May 2009 23:49:30 EDT
>
> In a message dated 30/05/2009, DSaum@............ writes:
>
> Hi  Chris
> Sounds interesting in theory, but how well does it actually  work?
> Do you have any data / spectra from your piezo device that shows  it
> picks up teleseismic events as well as a my horizontal 4.5 Hz  geophone?
> Dave
>
>
>
> Hi Dave,
>
>     There are more sensor construction details and  circuits at

snip

Hi Chris

Thanks for the construction details, but I still want to see
some of your actual data/spectra showing teleseismic detection
for your piezo system.  You ideas sound great but "There's many
a slip between the cup and the lip".

Dave
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: optimal position of magnetic dampter
From: "Geoffrey"  gmvoeth@........... 
Date: Sun, 31 May 2009 08:43:02 -0700

Isn't the velocity difference greater the further you get
from the center of a circle on a lever arm
and that would mean the closer to the very end
the better the signal and the damping ?
The free end I mean and not the fulcrum end.
Sort of like the cause of the coreolis pseudo force
but not exactly ? It is interesting the mass stays still
while the fulcrum moves yet the differences are at the end
and that's where it matters for sensing things.

might be nice to have a lever 32 miles long.

possibly a beam of light ( laser pointer ) makes a better lever.

This ranger guy showed me how he uses a laser pointer
to detect enemy movement after dark in the jungle.
I was thinking seismometer rather than enemies tho.
He also showed me how to break someone's knee with a side
kick but I'm really not interested in the violence
of humans but the violence of gods or devils that
creates earthquakes. Such wonderful people
here in the prison town called Apache Junction AZ.
They (City Council Members) seem to be a greater danger than anything
mother nature can throw ones way.
I'm thinking of the possibility of visiting Socrates one day.
Such a wonderful septic EARTH we live on in the Goldie locks zone.
:-)
geoff




----- Original Message ----- 
From: "Robert O. Green" <rog@..........>
To: <psn-l@..............>
Sent: Sunday, May 31, 2009 7:08 AM
Subject: optimal position of magnetic dampter


> Chris et al.,
> 
> What is the thinking on the optimal position of the magnetic damper (MD) 
> along the lower boom?
> 
> It seem by shifting the MD position towards or away from the lower pivot 
> one can tune the damping strength.
> 
> Rob
> 
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Position of magnetic damper relative to pivot
From: "Robert O. Green"  rog@.......... 
Date: Sun, 31 May 2009 09:14:26 -0700

He Geoffrey,

I understand one wants the magnetic damping MD effect to be about a 10th 
reduction in intensity for consecutive cycles of the boom.

It seems you can have a strong MD close to the pivot or a weak MD near 
the coil end to achieve this damping effect.

With a fixed strength MD one can tune the intensity reduction by 
shifting the position of the MD along the boom.

Are there other good reasons for the position of the MD.

Rob

Geoffrey wrote:
> Isn't the velocity difference greater the further you get
> from the center of a circle on a lever arm
> and that would mean the closer to the very end
> the better the signal and the damping ?
> The free end I mean and not the fulcrum end.
> Sort of like the cause of the coreolis pseudo force
> but not exactly ? It is interesting the mass stays still
> while the fulcrum moves yet the differences are at the end
> and that's where it matters for sensing things.
>
> might be nice to have a lever 32 miles long.
>
> possibly a beam of light ( laser pointer ) makes a better lever.
>
> This ranger guy showed me how he uses a laser pointer
> to detect enemy movement after dark in the jungle.
> I was thinking seismometer rather than enemies tho.
> He also showed me how to break someone's knee with a side
> kick but I'm really not interested in the violence
> of humans but the violence of gods or devils that
> creates earthquakes. Such wonderful people
> here in the prison town called Apache Junction AZ.
> They (City Council Members) seem to be a greater danger than anything
> mother nature can throw ones way.
> I'm thinking of the possibility of visiting Socrates one day.
> Such a wonderful septic EARTH we live on in the Goldie locks zone.
> :-)
> geoff
>
>
>
>
> ----- Original Message ----- From: "Robert O. Green" <rog@..........>
> To: <psn-l@..............>
> Sent: Sunday, May 31, 2009 7:08 AM
> Subject: optimal position of magnetic dampter
>
>
>> Chris et al.,
>>
>> What is the thinking on the optimal position of the magnetic damper 
>> (MD) along the lower boom?
>>
>> It seem by shifting the MD position towards or away from the lower 
>> pivot one can tune the damping strength.
>>
>> Rob
>>
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with the body 
>> of the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with the body of 
> the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
> ------------------------------------------------------------------------
>
>
> Internal Virus Database is out of date.
> Checked by AVG - http://www.avg.com 
> Version: 8.0.176 / Virus Database: 270.12.36/2128 - Release Date: 5/22/2009 6:03 AM
>
>   

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: optimal position of magnetic dampter
From: ChrisAtUpw@.......
Date: Sun, 31 May 2009 12:45:59 EDT

 
In a message dated 31/05/2009, rog@.......... writes:

What is  the thinking on the optimal position of the magnetic damper (MD) 
along the  lower boom?
It seem by shifting the MD position towards or away from the  lower pivot 
one can tune the damping strength.



Hi Rob,
 
    You need to have as low a vertical force on the  bottom suspension as 
practicable. I suggest that you put the mass on the end of  the arm and then 
slide the arm over a round horizontal rod until the weight of  the mass on 
one side balances the weight of the arm on the other. Mark this  point to 
attach the top suspension. Check the photos at 
_http://jclahr.com/science/psn/chapman/school/MKII/index.html_ 
(http://jclahr.com/science/psn/chapman/school/MKII/index.html)  
    You need the damping fairly close to the mass, but  this is not 
critical. But the damping plate DOES need to be lie on the  OFFSET line joining the 
centre of mass to the bottom suspension, hence the  offset mounting hole in 
the mass. This prevents a quake motion from trying  to rotate the mass as 
well as pushing it to one side. Please note that the  next modification was 
to fit the sensor block with a V wire top suspension. See  
_http://jclahr.com/science/psn/chapman/2008%20lehman/index.html_ 
(http://jclahr.com/science/psn/chapman/2008%20lehman/index.html)  This  30 lb fishing trace with looped 
ends worked very well indeed, preventing any  rotation of the mass around the 
long axis of the arm. 
    Have a look at the damper drawings at  
_http://jclahr.com/science/psn/chapman/lehman/index.html_ 
(http://jclahr.com/science/psn/chapman/lehman/index.html)  These  use a quad NdFeB magnet block. You only have to slide the 
block about 1/2" to  3/4" over the 1" magnets to get the correct damping. You 
adjust the separation  of the top and bottom mild steel backing plates to 
set the damping in this  range. But you also need to be able to remove the 
damping easily when setting  the period and to set the damping afterwards to 
0.7 critical, hence this layout  where the damping block simply slides along 
the baseplate. 
    This is a good, compact and easily adjusted design.  I can set a period 
of 30 seconds, no problem. The trimming of the  height of the arm, setting 
up the period and then setting the damping are all  sequential and non 
interacting adjustments.
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 31/05/2009, rog@.......... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>What is 
  the thinking on the optimal position of the magnetic damper (MD) <BR>alo=
ng the 
  lower boom?<BR>It seem by shifting the MD position towards or away from=
 the 
  lower pivot <BR>one can tune the damping strength.<BR></FONT></BLOCKQUOT=
E></DIV>
<DIV></DIV>
<DIV>Hi Rob,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You need to have as low a vertical force on=
 the 
bottom suspension as practicable. I suggest that you put the mass on the=
 end of 
the arm and then slide the arm over a round horizontal rod until the weigh=
t of 
the mass on one side balances the weight of the arm on the other. Mark thi=
s 
point to attach the top suspension. Check the photos at <A 
href=3D"http://jclahr.com/science/psn/chapman/school/MKII/index.html">http=
://jclahr.com/science/psn/chapman/school/MKII/index.html</A>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You need the damping fairly close to the mass=
, but 
this is not critical. But the damping plate&nbsp;DOES need to be lie on th=
e 
OFFSET line joining the centre of mass to the bottom suspension, hence the=
 
offset mounting hole in the mass. This prevents&nbsp;a quake motion from=
 trying 
to rotate the mass as well as pushing it to&nbsp;one side. Please note tha=
t the 
next modification was to fit the sensor block with a V wire top suspension=
.. See 
&nbsp;<A 
href=3D"http://jclahr.com/science/psn/chapman/2008%20lehman/index.html">ht=
tp://jclahr.com/science/psn/chapman/2008%20lehman/index.html</A>&nbsp;This=
 
30 lb fishing trace with looped ends worked very well indeed, preventing=
 any 
rotation of the mass around the long axis of the arm. </DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Have a look at the damper drawings at &nbsp;<=
A 
href=3D"http://jclahr.com/science/psn/chapman/lehman/index.html">http://jc=
lahr.com/science/psn/chapman/lehman/index.html</A>&nbsp;These 
use a quad NdFeB magnet block. You only have to slide the block about 1/2"=
 to 
3/4" over the 1" magnets to get the correct damping. You adjust the separa=
tion 
of the top and bottom mild steel backing plates to set the damping in this=
 
range. But you also need to be able to remove the damping easily when sett=
ing 
the period and to set the damping afterwards to 0.7 critical, hence this=
 layout 
where the damping block simply slides along the baseplate. </DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;This is a good, compact and easily adjusted=
 design. 
I can set&nbsp;a period of 30 seconds, no problem.&nbsp;The trimming of th=
e 
height of the arm, setting up the period and then setting the damping are=
 all 
sequential and non interacting adjustments.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Re: Geophones / Piezo sensors
From: "tchannel"  tchannel@............ 
Date: Sun, 31 May 2009 10:55:49 -0600

Hi Steve,   I can picture what you are describing, I think.........Do =
you know of any drawings, sketches, which shows this?   Is it just a =
"butterfly fan" which looks like tongue depressor and vibrates on one =
end?
Did he add a mass to the end?
Thanks, Ted
  ----- Original Message -----=20
  From: Steve Hammond=20
  To: psn-l@.................
  Sent: Saturday, May 30, 2009 10:31 PM
  Subject: RE: Geophones / Piezo sensors


  This is a really old idea. It's funny how things keep coming back =
around. In 1991 Bob Ogborn of San Jose and later Texas built a bunch of =
these types of devices. They are best for short periods and local =
events. His design was simple. He used the Piezo butterfly fan from the =
Apple computer and encased it in a short length of PVC pipe with two PVC =
caps. He drilled a hole in one cap for the wires to exit and filled the =
device with oil for damping and then sealed it up with glue. They worked =
well enough but they can generate a lot of current if they are tapped =
too hard so he had to protect the circuit with two clamping diodes or =
the current would fry the electronics.=20

  Regards, Steve Hammond PSN San Jose, Aptos CA.   =20

  =20

  From: psn-l-request@.............. =
[mailto:psn-l-request@............... On Behalf Of ChrisAtUpw@.......
  Sent: Saturday, May 30, 2009 8:50 PM
  To: psn-l@..............
  Subject: Re: Geophones / Piezo sensors

  =20

  In a message dated 30/05/2009, DSaum@............ writes:

    Hi Chris
    Sounds interesting in theory, but how well does it actually work?
    Do you have any data / spectra from your piezo device that shows it
    picks up teleseismic events as well as a my horizontal 4.5 Hz =
geophone?
    Dave

  Hi Dave,

  =20

      There are more sensor construction details and circuits at =
http://www.jclahr.com/science/psn/chapman/piezo/index.html Please Note =
that the stated circuit components and their values are critical to =
success.

  =20

      The device acts as an accelerometer, but the internal noise of =
capacitor is very low and the voltage sensitivity to bending stresses is =
high.

  =20

      I initially extended the period of my 4.5 Hz geophones by x10 to =
0.5 Hz using a modified Roberts circuit and it worked fine. See =
http://www.jclahr.com/science/psn/roberts/index.html The increased =
response to teleseismic P and S waves is very evident. The modifications =
were to effectively add a high pass function at about 0.3 Hz to remove =
most of the 1/f  VLF noise, that the original circuit displays only too =
well. You can use CAZ opamps for the input stages ($$), but a filter =
also reduces 6 second microseism noise, which is also quite obvious. I =
do not find microseisms particularly interesting.

  =20

      Lennartz put a negative input impedance amplifier onto 4.5 or 2 Hz =
geophones and amplify the current required to keep the mass stationary. =
They can increase the response period to 20 seconds this way, but you =
need careful temperature compensation and a very low noise amplifier. =
See =
http://www.lennartz-electronic.de/Pages/Seismology/Seismometers/Seismomet=
ers.html The NoeMax triaxial sensor used in French schools appears to be =
similar but they are not exactly cheap either. See =
http://www.agecodagis.com/WebData/Documentation/Commercial/NoeMax/NoeMax.=
pdf  The apparent output response below 0.05 Hz concerns me and it =
crosses the NHNM high ground noise plot. Extending 4.5 Hz geophones to =
20 seconds is a factor of x90. This would be below the noise level of =
the 'standard' seismic amplifier that I used.=20

  =20

      I first made a very simple piezo detector by sticking a disk onto =
two ridges of adhesive silicone rubber spaced 1.25" apart on a backing =
plate. This silicone adhesive does NOT smell of acetic acid / vinegar. I =
then stuck a brass rod parallel to the ridges on the top centre of the =
disk. I used a unity gain FET amplifier to provide a signal for the same =
amplifier used for observing the geophone signal. The piezo signal for =
the background noise was about 5x that of the geophone, measured on an =
oscilloscpe. I then tried to optimise the design and extend the period =
as far as practicable. My sensors do work fine to well below 1 Hz. I do =
not know about yours, Dave.

  =20

      Regards,

  =20

      Chris Chapman

  =20

  =20
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<BODY id=3Drole_body lang=3DEN-US link=3Dblue bgColor=3D#ffffff =
vLink=3Dpurple>
<DIV><FONT size=3D2 face=3DArial>Hi Steve,&nbsp;&nbsp; I can picture =
what you are=20
describing, I think.........Do you know of any drawings, sketches, which =
shows=20
this?&nbsp;&nbsp; Is it just a "butterfly fan" which looks like tongue =
depressor=20
and vibrates on one end?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Did he add a mass to the =
end?</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Thanks, Ted</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; PADDING-LEFT: 5px; =
PADDING-RIGHT: 0px; MARGIN-LEFT: 5px; MARGIN-RIGHT: 0px"=20
dir=3Dltr>
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"FONT: 10pt arial; BACKGROUND: #e4e4e4; font-color: =
black"><B>From:</B>=20
  <A title=3Dshammon1@............. =
href=3D"mailto:shammon1@.............">Steve=20
  Hammond</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Saturday, May 30, 2009 =
10:31=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> RE: Geophones / Piezo=20
  sensors</DIV>
  <DIV><BR></DIV>
  <DIV class=3DSection1>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt">This=20
  is a really old idea. It=92s funny how things keep coming back around. =
In 1991=20
  Bob Ogborn of San Jose and later Texas built a bunch of these types of =

  devices. They are best for short periods and local events. His design =
was=20
  simple. He used the Piezo butterfly fan from the Apple computer and =
encased it=20
  in a short length of PVC pipe with two PVC caps. He drilled a hole in =
one cap=20
  for the wires to exit and filled the device with oil for damping and =
then=20
  sealed it up with glue. They worked well enough but they can generate =
a lot of=20
  current if they are tapped too hard so he had to protect the circuit =
with two=20
  clamping diodes or the current would fry the electronics.=20
  <o:p></o:p></SPAN></P>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt">Regards,=20
  Steve Hammond PSN San Jose, Aptos CA. =
&nbsp;&nbsp;&nbsp;<o:p></o:p></SPAN></P>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Calibri','sans-serif'; COLOR: #1f497d; =
FONT-SIZE: 11pt"><o:p>&nbsp;</o:p></SPAN></P>
  <DIV>
  <DIV=20
  style=3D"BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; =
PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: =
#b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt">
  <P class=3DMsoNormal><B><SPAN=20
  style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: =
10pt">From:</SPAN></B><SPAN=20
  style=3D"FONT-FAMILY: 'Tahoma','sans-serif'; FONT-SIZE: 10pt">=20
  psn-l-request@.............. [mailto:psn-l-request@............... =
<B>On=20
  Behalf Of </B>ChrisAtUpw@.......<BR><B>Sent:</B> Saturday, May 30, =
2009 8:50=20
  PM<BR><B>To:</B> psn-l@..............<BR><B>Subject:</B> Re: Geophones =
/ Piezo=20
  sensors<o:p></o:p></SPAN></P></DIV></DIV>
  <P class=3DMsoNormal><o:p>&nbsp;</o:p></P>
  <DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">In a=20
  message dated 30/05/2009, DSaum@...............
  writes:<o:p></o:p></SPAN></P></DIV>
  <BLOCKQUOTE=20
  style=3D"BORDER-BOTTOM: medium none; BORDER-LEFT: blue 1.5pt solid; =
PADDING-BOTTOM: 0in; MARGIN-TOP: 5pt; PADDING-LEFT: 4pt; PADDING-RIGHT: =
0in; MARGIN-BOTTOM: 5pt; MARGIN-LEFT: 3.75pt; BORDER-TOP: medium none; =
BORDER-RIGHT: medium none; PADDING-TOP: 0in">
    <P class=3DMsoNormal><SPAN=20
    style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">Hi=20
    Chris<BR>Sounds interesting in theory, but how well does it actually =

    work?<BR>Do you have any data / spectra from your piezo device that =
shows=20
    it<BR>picks up teleseismic events as well as a my horizontal 4.5 Hz=20
    geophone?<BR>Dave<o:p></o:p></SPAN></P></BLOCKQUOTE></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">Hi=20
  Dave,<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;&nbsp;&nbsp;&nbsp;There=20
  are more sensor construction details and circuits at <A=20
  =
href=3D"http://www.jclahr.com/science/psn/chapman/piezo/index.html">http:=
//www.jclahr.com/science/psn/chapman/piezo/index.html</A>&nbsp;Please=20
  Note that the stated circuit components&nbsp;and their values are =
critical to=20
  success.<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;&nbsp;&nbsp;&nbsp;The=20
  device acts as an accelerometer, but the internal noise of capacitor =
is very=20
  low and the voltage sensitivity to bending stresses is=20
  high.<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;&nbsp;&nbsp;&nbsp;I=20
  initially extended the period of my 4.5 Hz geophones by x10 to 0.5 Hz =
using a=20
  modified Roberts circuit and it worked fine. See <A=20
  =
href=3D"http://www.jclahr.com/science/psn/roberts/index.html">http://www.=
jclahr.com/science/psn/roberts/index.html</A>&nbsp;The=20
  increased response to teleseismic P and S waves is very evident. The=20
  modifications were to effectively add a&nbsp;high pass function at =
about 0.3=20
  Hz to remove most of the 1/f&nbsp; VLF noise, that the original =
circuit=20
  displays only too well. You can use CAZ opamps for the input stages =
($$), but=20
  a filter also reduces 6 second microseism noise, which is also quite =
obvious.=20
  I do not find microseisms particularly=20
interesting.<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;&nbsp;&nbsp;&nbsp;Lennartz=20
  put a negative input impedance amplifier onto 4.5 or 2 Hz geophones =
and=20
  amplify the current required to keep the mass stationary. They can =
increase=20
  the response period&nbsp;to 20 seconds this way, but you =
need&nbsp;careful=20
  temperature compensation and a very low noise amplifier.&nbsp;See <A=20
  =
href=3D"http://www.lennartz-electronic.de/Pages/Seismology/Seismometers/S=
eismometers.html">http://www.lennartz-electronic.de/Pages/Seismology/Seis=
mometers/Seismometers.html</A>&nbsp;The=20
  NoeMax triaxial&nbsp;sensor used in French schools appears to =
be&nbsp;similar=20
  but they are not exactly cheap either. See <A=20
  =
href=3D"http://www.agecodagis.com/WebData/Documentation/Commercial/NoeMax=
/NoeMax.pdf">http://www.agecodagis.com/WebData/Documentation/Commercial/N=
oeMax/NoeMax.pdf</A>&nbsp;=20
  The apparent output response below 0.05 Hz concerns me and it crosses =
the NHNM=20
  high ground noise plot. Extending 4.5 Hz geophones to 20 seconds is a =
factor=20
  of x90. This would be below the noise level of the 'standard' seismic=20
  amplifier that I used.&nbsp;<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;&nbsp;&nbsp;&nbsp;I=20
  first made a very simple piezo detector by sticking a disk onto two =
ridges of=20
  adhesive silicone rubber spaced 1.25" apart on a backing plate. This =
silicone=20
  adhesive does NOT smell of acetic acid / vinegar. I then stuck a brass =
rod=20
  parallel to the ridges on the top centre of the disk. I used a unity =
gain FET=20
  amplifier to provide a signal for the same amplifier used for =
observing the=20
  geophone signal. The piezo signal for the background noise was about =
5x that=20
  of the geophone, measured on an oscilloscpe.&nbsp;I then tried to =
optimise the=20
  design and extend the period as far as practicable. My sensors&nbsp;do =
work=20
  fine to well below 1 Hz.&nbsp;I do not know about&nbsp;yours,=20
  Dave.<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;&nbsp;&nbsp;&nbsp;Regards,<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;&nbsp;&nbsp;&nbsp;Chris=20
  Chapman<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;<o:p></o:p></SPAN></P></DIV>
  <DIV>
  <P class=3DMsoNormal><SPAN=20
  style=3D"FONT-FAMILY: 'Arial','sans-serif'; COLOR: black; FONT-SIZE: =
10pt">&nbsp;<o:p></o:p></SPAN></P></DIV></DIV></BLOCKQUOTE></BODY></HTML>=


Subject: Re: optimal position of magnetic dampter
From: JAMES RIDOUT  jamesridout@.............. 
Date: Sun, 31 May 2009 17:38:33 +0000 (GMT)

I have the damping plate underneath of the boom on my Lehman seup. is this =
wrong ? As mentioned, quake movement would try to rotate the boom & weight.=
 would i see any difference if i mounted the plate and magnet level with th=
e boom?


--- On Sun, 31/5/09, ChrisAtUpw@....... <ChrisAtUpw@.......> wrote:


From: ChrisAtUpw@....... <ChrisAtUpw@.......>
Subject: Re: optimal position of magnetic dampter
To: psn-l@..............
Date: Sunday, 31 May, 2009, 5:45 PM




In a message dated 31/05/2009, rog@.......... writes:
What is the thinking on the optimal position of the magnetic damper (MD)=20
along the lower boom?
It seem by shifting the MD position towards or away from the lower pivot=20
one can tune the damping strength.


Hi Rob,
=A0
=A0=A0=A0=A0You need to have as low a vertical force on the bottom suspensi=
on as practicable. I suggest that you put the mass on the end of the arm an=
d then slide the arm over a round horizontal rod until the weight of the ma=
ss on one side balances the weight of the arm on the other. Mark this point=
 to attach the top suspension. Check the photos at http://jclahr.com/scienc=
e/psn/chapman/school/MKII/index.html=A0
=A0=A0=A0=A0You need the damping fairly close to the mass, but this is not =
critical. But the damping plate=A0DOES need to be lie on the OFFSET line jo=
ining the centre of mass to the bottom suspension, hence the offset mountin=
g hole in the mass. This prevents=A0a quake motion from trying to rotate th=
e mass as well as pushing it to=A0one side. Please note that the next modif=
ication was to fit the sensor block with a V wire top suspension. See =A0ht=
tp://jclahr.com/science/psn/chapman/2008%20lehman/index.html=A0This 30 lb f=
ishing trace with looped ends worked very well indeed, preventing any rotat=
ion of the mass around the long axis of the arm.=20
=A0=A0=A0=A0Have a look at the damper drawings at =A0http://jclahr.com/scie=
nce/psn/chapman/lehman/index.html=A0These use a quad NdFeB magnet block. Yo=
u only have to slide the block about 1/2" to 3/4" over the 1" magnets to ge=
t the correct damping. You adjust the separation of the top and bottom mild=
 steel backing plates to set the damping in this range. But you also need t=
o be able to remove the damping easily when setting the period and to set t=
he damping afterwards to 0.7 critical, hence this layout where the damping =
block simply slides along the baseplate.=20
=A0=A0=A0=A0This is a good, compact and easily adjusted design. I can set=
=A0a period of 30 seconds, no problem.=A0The trimming of the height of the =
arm, setting up the period and then setting the damping are all sequential =
and non interacting adjustments.
=A0
=A0=A0=A0=A0Regards,
=A0
=A0=A0=A0=A0Chris Chapman
<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;"><DIV>I have the damping plate underneath of t=
he boom on my Lehman seup. is this wrong ? As mentioned, quake movement wou=
ld try to rotate the boom &amp; weight. would i see any difference if i mou=
nted the plate and magnet level with the boom?</DIV>
<DIV><BR><BR>--- On <B>Sun, 31/5/09, ChrisAtUpw@....... <I>&lt;ChrisAtUpw@a=
ol.com&gt;</I></B> wrote:<BR></DIV>
<BLOCKQUOTE style=3D"BORDER-LEFT: rgb(16,16,255) 2px solid; PADDING-LEFT: 5=
px; MARGIN-LEFT: 5px"><BR>From: ChrisAtUpw@....... &lt;ChrisAtUpw@.......&g=
t;<BR>Subject: Re: optimal position of magnetic dampter<BR>To: psn-l@webtro=
nics.com<BR>Date: Sunday, 31 May, 2009, 5:45 PM<BR><BR>
<DIV id=3Dyiv552990085><FONT id=3Drole_document color=3D#000000 size=3D2 fa=
ce=3DArial>
<DIV>
<DIV>In a message dated 31/05/2009, rog@.......... writes:</DIV>
<BLOCKQUOTE style=3D"BORDER-LEFT: blue 2px solid; PADDING-LEFT: 5px; MARGIN=
-LEFT: 5px"><FONT style=3D"BACKGROUND-COLOR: transparent" color=3D#000000 s=
ize=3D2 face=3DArial>What is the thinking on the optimal position of the ma=
gnetic damper (MD) <BR>along the lower boom?<BR>It seem by shifting the MD =
position towards or away from the lower pivot <BR>one can tune the damping =
strength.<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Rob,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You need to have as low a vertical force on th=
e bottom suspension as practicable. I suggest that you put the mass on the =
end of the arm and then slide the arm over a round horizontal rod until the=
 weight of the mass on one side balances the weight of the arm on the other=
.. Mark this point to attach the top suspension. Check the photos at <A href=
=3D"http://jclahr.com/science/psn/chapman/school/MKII/index.html" rel=3Dnof=
ollow target=3D_blank>http://jclahr.com/science/psn/chapman/school/MKII/ind=
ex.html</A>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You need the damping fairly close to the mass,=
 but this is not critical. But the damping plate&nbsp;DOES need to be lie o=
n the OFFSET line joining the centre of mass to the bottom suspension, henc=
e the offset mounting hole in the mass. This prevents&nbsp;a quake motion f=
rom trying to rotate the mass as well as pushing it to&nbsp;one side. Pleas=
e note that the next modification was to fit the sensor block with a V wire=
 top suspension. See &nbsp;<A href=3D"http://jclahr.com/science/psn/chapman=
/2008%20lehman/index.html" rel=3Dnofollow target=3D_blank>http://jclahr.com=
/science/psn/chapman/2008%20lehman/index.html</A>&nbsp;This 30 lb fishing t=
race with looped ends worked very well indeed, preventing any rotation of t=
he mass around the long axis of the arm. </DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Have a look at the damper drawings at &nbsp;<A=
 href=3D"http://jclahr.com/science/psn/chapman/lehman/index.html" rel=3Dnof=
ollow target=3D_blank>http://jclahr.com/science/psn/chapman/lehman/index.ht=
ml</A>&nbsp;These use a quad NdFeB magnet block. You only have to slide the=
 block about 1/2" to 3/4" over the 1" magnets to get the correct damping. Y=
ou adjust the separation of the top and bottom mild steel backing plates to=
 set the damping in this range. But you also need to be able to remove the =
damping easily when setting the period and to set the damping afterwards to=
 0.7 critical, hence this layout where the damping block simply slides alon=
g the baseplate. </DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;This is a good, compact and easily adjusted de=
sign. I can set&nbsp;a period of 30 seconds, no problem.&nbsp;The trimming =
of the height of the arm, setting up the period and then setting the dampin=
g are all sequential and non interacting adjustments.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></DIV></BLOCKQUOTE><=
/td></tr></table>

Subject: Re: Level of garden gate style horizontal seismometers
From: ChrisAtUpw@.......
Date: Sun, 31 May 2009 21:05:57 EDT

 
In a message dated 30/05/2009 22:31:46 GMT Daylight Time,  
gmvoeth@........... writes:

Hello  PSN;

Just out of curiosity has any of you guys with
those garden  gate seismometers ever put one
of these little plastic levels on the  lever
to see just how far off level it is at
10 or 20 seconds. I mean  here like 1/2,
1/4 or so a bubble across the line
if you understand what  I mean here ?

Maybe it is not even crossing the line
but you can see  possibly its off level
and just touching the reference line ?

They  got these fish eye levels that just tell you
the horizontal and I thought  that that might help set
up your period ??

Has anyone ever seen a  cheap calibrated level
that will tell you fractions of a degree
off  level ?

Metrology, I have always thought, would be
a good profession  to be in. :-)




<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 30/05/2009 22:31:46 GMT Daylight Time, 
gmvoeth@........... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>Hello 
  PSN;<BR><BR>Just out of curiosity has any of you guys with<BR>those gard=
en 
  gate seismometers ever put one<BR>of these little plastic levels on the=
 
  lever<BR>to see just how far off level it is at<BR>10 or 20 seconds. I=
 mean 
  here like 1/2,<BR>1/4 or so a bubble across the line<BR>if you understan=
d what 
  I mean here ?<BR><BR>Maybe it is not even crossing the line<BR>but you=
 can see 
  possibly its off level<BR>and just touching the reference line ?<BR><BR>=
They 
  got these fish eye levels that just tell you<BR>the horizontal and I tho=
ught 
  that that might help set<BR>up your period ??<BR><BR>Has anyone ever see=
n a 
  cheap calibrated level<BR>that will tell you fractions of a degree<BR>of=
f 
  level ?<BR><BR>Metrology, I have always thought, would be<BR>a good prof=
ession 
  to be in. :-)<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>&nbsp;</DIV></FONT></BODY></HTML>

Subject: Re: Level of garden gate style horizontal seismometers
From: ChrisAtUpw@.......
Date: Sun, 31 May 2009 21:13:43 EDT

In a message dated 30/05/2009, gmvoeth@........... writes:

Just out  of curiosity has any of you guys with those garden gate 
seismometers ever put  one of these little plastic levels on the lever to see just 
how far off level  it is at 10 or 20 seconds. I mean ere like 1/2, 1/4 or so a 
bubble across the  line if you understand what I mean here ?
Hi Geoff,
 
    My 9" spirit level shows ~1.5 deg change when the  bubble moves by it's 
own length. 
    The tilt angle of a 1.5 second arm extended to 20  seconds is 0.32 
Degrees.
 
    Regards,
 
    Chris Chapman




<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>In a message dated 30/05/2009, gmvoeth@........... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>Just out 
  of curiosity has any of you guys with those garden gate seismometers eve=
r put 
  one of these little plastic levels on the lever to see just how far off=
 level 
  it is at 10 or 20 seconds. I mean ere like 1/2, 1/4 or so a bubble acros=
s the 
  line if you understand what I mean here ?</FONT></BLOCKQUOTE>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0=
00000 
size=3D2>Hi Geoff,</FONT></DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0=
00000 
size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0=
00000 
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;My 9" spirit level shows ~1.5 deg change=
 when the 
bubble moves by it's own length.&nbsp;</FONT></DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0=
00000 
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;The tilt angle of a 1.5 second arm extend=
ed to 20 
seconds is 0.32 Degrees.</FONT></DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0=
00000 
size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0=
00000 
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</FONT></DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0=
00000 
size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#0=
00000 
size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV>
<DIV><BR></DIV></FONT>
<DIV></DIV>
<DIV>&nbsp;</DIV></FONT></BODY></HTML>

Subject: Re: optimal position of magnetic damper & 2 X 1 inch NdFeB magnets
From: "Robert O. Green"  rog@.......... 
Date: Sun, 31 May 2009 18:51:41 -0700

Chris,

Thank you as always the advice and pictures are wonderfully helpful.

I am experimenting with a pair of 2 X 1 X 0.25 inch NdFeB magnets with 
spacers at each end and a 1.5 inch Al damping plate.

Rob

ChrisAtUpw@....... wrote:
> In a message dated 31/05/2009, rog@.......... writes:
>
>     What is the thinking on the optimal position of the magnetic
>     damper (MD)
>     along the lower boom?
>     It seem by shifting the MD position towards or away from the lower
>     pivot
>     one can tune the damping strength.
>
> Hi Rob,
>  
>     You need to have as low a vertical force on the bottom suspension 
> as practicable. I suggest that you put the mass on the end of the arm 
> and then slide the arm over a round horizontal rod until the weight of 
> the mass on one side balances the weight of the arm on the other. Mark 
> this point to attach the top suspension. Check the photos at 
> http://jclahr.com/science/psn/chapman/school/MKII/index.html 
>     You need the damping fairly close to the mass, but this is not 
> critical. But the damping plate DOES need to be lie on the OFFSET line 
> joining the centre of mass to the bottom suspension, hence the offset 
> mounting hole in the mass. This prevents a quake motion from trying to 
> rotate the mass as well as pushing it to one side. Please note that 
> the next modification was to fit the sensor block with a V wire top 
> suspension. See 
>  http://jclahr.com/science/psn/chapman/2008%20lehman/index.html This 
> 30 lb fishing trace with looped ends worked very well indeed, 
> preventing any rotation of the mass around the long axis of the arm.
>     Have a look at the damper drawings at 
>  http://jclahr.com/science/psn/chapman/lehman/index.html These use a 
> quad NdFeB magnet block. You only have to slide the block about 1/2" 
> to 3/4" over the 1" magnets to get the correct damping. You adjust the 
> separation of the top and bottom mild steel backing plates to set the 
> damping in this range. But you also need to be able to remove the 
> damping easily when setting the period and to set the damping 
> afterwards to 0.7 critical, hence this layout where the damping block 
> simply slides along the baseplate.
>     This is a good, compact and easily adjusted design. I can set a 
> period of 30 seconds, no problem. The trimming of the height of the 
> arm, setting up the period and then setting the damping are all 
> sequential and non interacting adjustments.
>  
>     Regards,
>  
>     Chris Chapman
> ------------------------------------------------------------------------
>
>
> Internal Virus Database is out of date.
> Checked by AVG - http://www.avg.com 
> Version: 8.0.176 / Virus Database: 270.12.36/2128 - Release Date: 5/22/2009 6:03 AM
>
>   

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Public Seismic Network Mailing List (PSN-L)


Subject: Northeast of Puerto Rico...
From: "Kareem Lanier"  system98765@............. 
Date: Sun, 31 May 2009 22:13:31 -0700


Possible impending large event northeast of the Puerto Rico area, perhaps
undersea? 

http://earthquake.usgs.gov/eqcenter/recenteqsww/Maps/10/295_20.php







------------------
Kareem J. Lanier
El Sobrante, California (N37.96 W122.32)
East Bay Area Region

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Public Seismic Network Mailing List (PSN-L)


Subject: Re: Level of garden gate style horizontal seismometers
From: "Jim and Connie Lehman"  lehmancj@........... 
Date: Mon, 1 Jun 2009 11:06:10 -0400

Good work Chris on the approximation of tilt in the garden gate style =
seismometers.  I attempted this calculation once upon a time by =
installing a turnbuckle in the support wire--raising the mass till it =
was unstable, then a half turn or more backwards would bring the period =
to 18 sec. and stability.
   I achieved better results from using .005 and.010 in. sheet metal =
shims under the "front" single support of the tripod base.  I started at =
10 sec, added shims carefully till instability, and then removed shims =
to the desired period.  The thickness of the shims removed gave an idea =
of tilt, which I converted to approximately 0.5 degree.
        Keep up the good work in amateur seismology-- Jim Lehman
  ----- Original Message -----=20
  From: ChrisAtUpw@..........
  To: psn-l@.................
  Sent: Sunday, May 31, 2009 9:13 PM
  Subject: Re: Level of garden gate style horizontal seismometers


  In a message dated 30/05/2009, gmvoeth@........... writes:
    Just out of curiosity has any of you guys with those garden gate =
seismometers ever put one of these little plastic levels on the lever to =
see just how far off level it is at 10 or 20 seconds. I mean ere like =
1/2, 1/4 or so a bubble across the line if you understand what I mean =
here ?
  Hi Geoff,

      My 9" spirit level shows ~1.5 deg change when the bubble moves by =
it's own length.=20
      The tilt angle of a 1.5 second arm extended to 20 seconds is 0.32 =
Degrees.

      Regards,

      Chris Chapman


<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1">
<META content=3D"MSHTML 6.00.6000.16830" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; =
FONT-FAMILY: Arial"=20
bottomMargin=3D7 bgColor=3D#ffffff leftMargin=3D7 topMargin=3D7 =
rightMargin=3D7>
<DIV>Good work Chris on the approximation of tilt in the garden gate =
style=20
seismometers.&nbsp; I attempted this calculation once upon a time by =
installing=20
a turnbuckle in the support wire--raising the mass till it was unstable, =
then a=20
half turn or more&nbsp;backwards&nbsp;would bring the period to 18 sec. =
and=20
stability.</DIV>
<DIV>&nbsp;&nbsp; I achieved better results from using&nbsp;.005 and.010 =
in.=20
sheet metal shims under the "front" single support of the tripod =
base.&nbsp; I=20
started at 10 sec, added shims carefully till instability, and then =
removed=20
shims to the desired period.&nbsp; The thickness of the shims removed =
gave an=20
idea of tilt, which I converted to approximately 0.5 degree.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Keep up the good work in =
amateur=20
seismology-- Jim Lehman</DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3DChrisAtUpw@..........
  href=3D"mailto:ChrisAtUpw@.......">ChrisAtUpw@.......</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dpsn-l@.................
  href=3D"mailto:psn-l@..............">psn-l@..............</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Sunday, May 31, 2009 9:13 =
PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: Level of garden =
gate style=20
  horizontal seismometers</DIV>
  <DIV><BR></DIV><FONT id=3Drole_document face=3DArial color=3D#000000 =
size=3D2>
  <DIV>In a message dated 30/05/2009, <A=20
  href=3D"mailto:gmvoeth@...........">gmvoeth@...........</A> =
writes:</DIV>
  <BLOCKQUOTE=20
  style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px =
solid"><FONT=20
    style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 =
size=3D2>Just=20
    out of curiosity has any of you guys with those garden gate =
seismometers=20
    ever put one of these little plastic levels on the lever to see just =
how far=20
    off level it is at 10 or 20 seconds. I mean ere like 1/2, 1/4 or so =
a bubble=20
    across the line if you understand what I mean here =
?</FONT></BLOCKQUOTE>
  <DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial =
color=3D#000000=20
  size=3D2>Hi Geoff,</FONT></DIV>
  <DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial =
color=3D#000000=20
  size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial =
color=3D#000000=20
  size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;My 9" spirit level shows ~1.5 deg =
change when=20
  the bubble moves by it's own length.&nbsp;</FONT></DIV>
  <DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial =
color=3D#000000=20
  size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;The tilt angle of a 1.5 second arm =
extended to=20
  20 seconds is 0.32 Degrees.</FONT></DIV>
  <DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial =
color=3D#000000=20
  size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial =
color=3D#000000=20
  size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</FONT></DIV>
  <DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial =
color=3D#000000=20
  size=3D2></FONT>&nbsp;</DIV>
  <DIV><FONT style=3D"BACKGROUND-COLOR: transparent" face=3DArial =
color=3D#000000=20
  size=3D2>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV>
  <DIV><BR></DIV></FONT>
  <DIV></DIV>
  <DIV>&nbsp;</DIV></BLOCKQUOTE></FONT></BODY></HTML>

Subject: Has this been tried?
From: "tchannel"  tchannel@............ 
Date: Mon, 1 Jun 2009 10:11:35 -0600

Hi Folks,  I should start by saying "it has" I just did......I took some =
ring magnets and slipped them over a length of brass and chrome  tv =
antenna.  North to North, so the top magnet floats above the bottom one. =
 I then slipped a coil over the top magnet, so its position is South =
pole just entering the coil.

The result is somewhat as if the top magnet is hanging from a spring.   =
There it bobs up and down when the coil and pvc housing are moved or =
touched.   I tried to measure the frequency and a good guess is 3 to 4 =
Hz.

I would welcome your comments.   It is plugged in and online now.    No =
Earthquakes yet, and I have no idea if it will work.    I do know it =
responds to drop test, vertically, up to 100 feet away.  I do know it =
does not show any noises.    A train passed by and both my vertical and =
horz. pick it up, but there was zero on this experiment.

One observation is the floating top magnet, has some friction as it =
drags on the chrome rod,  however not much.
Another observation is the top magnet feels as if it is suspended by a =
stiff spring.  When you push down on it, the force field is great.  On =
the other hand I think it is in a weightless state, between gravity and =
this field, the same as if hanging from a spring.

I would guess this has been tried.   Probably unsuccessfully as I have =
never seen it.    I will leave it plugged in and see what happens.

Ted

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18702">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2 face=3DArial>Hi Folks,&nbsp; I should start by =
saying "it has" I=20
just did......I took some ring magnets and slipped them over a length of =
brass=20
and chrome&nbsp; tv antenna.&nbsp; North to North, so the =
top&nbsp;magnet floats=20
above the bottom one.&nbsp; I then slipped a coil over the top magnet, =
so its=20
position is South pole just entering the coil.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>The result is somewhat as if the top =
magnet is=20
hanging from a spring.&nbsp;&nbsp; There it bobs up and down when the =
coil and=20
pvc housing are moved or touched.&nbsp;&nbsp; I tried to measure the =
frequency=20
and a good guess is 3 to 4 Hz.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>I would welcome your =
comments.&nbsp;&nbsp; It is=20
plugged in and online now.&nbsp;&nbsp;&nbsp; No Earthquakes yet, and I =
have no=20
idea if it will work.&nbsp;&nbsp;&nbsp; I do know it responds to drop =
test,=20
vertically, up to 100 feet away.&nbsp; I do know it does not show any=20
noises.&nbsp;&nbsp;&nbsp; A train passed by and both my vertical and =
horz. pick=20
it up, but there was zero on this experiment.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>One observation is the floating top =
magnet, has=20
some friction as it drags on the chrome rod,&nbsp; however&nbsp;not=20
much.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial>Another observation is the top magnet =
feels as if=20
it is suspended by a stiff spring.&nbsp; When you push down on it, the =
force=20
field is great.&nbsp; On the other hand I think it is in a weightless =
state,=20
between gravity and this field, the same as if hanging from a=20
spring.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>I would guess this has been =
tried.&nbsp;&nbsp;=20
Probably unsuccessfully as I have never seen it.&nbsp;&nbsp;&nbsp; I =
will leave=20
it plugged in and see what happens.</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial>Ted</FONT></DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT size=3D2 face=3DArial></FONT>&nbsp;</DIV></BODY></HTML>

Subject: Re: Has this been tried?
From: Thomas Dick  dickthomas01@............. 
Date: Mon, 01 Jun 2009 12:56:09 -0500

tchannel wrote:
> Hi Folks,  I should start by saying "it has" I just did......I took 
> some ring magnets and slipped them over a length of brass and chrome  
> tv antenna.  North to North, so the top magnet floats above the bottom 
> one.  I then slipped a coil over the top magnet, so its position is 
> South pole just entering the coil.
>  
> The result is somewhat as if the top magnet is hanging from a 
> spring.   There it bobs up and down when the coil and pvc housing are 
> moved or touched.   I tried to measure the frequency and a good guess 
> is 3 to 4 Hz.
I tried that many years ago. I used light emitting diodes. I never got 
it to work. After Chris got me up with Lehmans and magnetic dampening, I 
realized the earth's magnetic field would be an issue and any stray 
fields created by motors, lightning, sunspots etc would require 
shielding. I also had issues of torque between magnets. Let me know how 
you do.
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Subject: Re: optimal position of magnetic dampter
From: "Geoffrey"  gmvoeth@........... 
Date: Mon, 1 Jun 2009 22:01:26 -0700

Chris;

Do you really mean Q of 0.7
Which is a Damping of 1/0.7 ?

If I make a filter with a damping
of only 0.7 I get a peak in
the roll off response instead of a Butterworth
profile ?

Regards;
geoff

----- Original Message ----- 
From: <ChrisAtUpw@.......>
To: <psn-l@..............>
Sent: Sunday, May 31, 2009 9:45 AM
Subject: Re: optimal position of magnetic dampter


> 
> In a message dated 31/05/2009, rog@.......... writes:
> 
> What is  the thinking on the optimal position of the magnetic damper (MD) 
> along the  lower boom?
> It seem by shifting the MD position towards or away from the  lower pivot 
> one can tune the damping strength.
> 
> 
> 
> Hi Rob,
> 
>    You need to have as low a vertical force on the  bottom suspension as 
> practicable. I suggest that you put the mass on the end of  the arm and then 
> slide the arm over a round horizontal rod until the weight of  the mass on 
> one side balances the weight of the arm on the other. Mark this  point to 
> attach the top suspension. Check the photos at 
> _http://jclahr.com/science/psn/chapman/school/MKII/index.html_ 
> (http://jclahr.com/science/psn/chapman/school/MKII/index.html)  
>    You need the damping fairly close to the mass, but  this is not 
> critical. But the damping plate DOES need to be lie on the  OFFSET line joining the 
> centre of mass to the bottom suspension, hence the  offset mounting hole in 
> the mass. This prevents a quake motion from trying  to rotate the mass as 
> well as pushing it to one side. Please note that the  next modification was 
> to fit the sensor block with a V wire top suspension. See  
> _http://jclahr.com/science/psn/chapman/2008%20lehman/index.html_ 
> (http://jclahr.com/science/psn/chapman/2008%20lehman/index.html)  This  30 lb fishing trace with looped 
> ends worked very well indeed, preventing any  rotation of the mass around the 
> long axis of the arm. 
>    Have a look at the damper drawings at  
> _http://jclahr.com/science/psn/chapman/lehman/index.html_ 
> (http://jclahr.com/science/psn/chapman/lehman/index.html)  These  use a quad NdFeB magnet block. You only have to slide the 
> block about 1/2" to  3/4" over the 1" magnets to get the correct damping. You 
> adjust the separation  of the top and bottom mild steel backing plates to 
> set the damping in this  range. But you also need to be able to remove the 
> damping easily when setting  the period and to set the damping afterwards to 
> 0.7 critical, hence this layout  where the damping block simply slides along 
> the baseplate. 
>    This is a good, compact and easily adjusted design.  I can set a period 
> of 30 seconds, no problem. The trimming of the  height of the arm, setting 
> up the period and then setting the damping are all  sequential and non 
> interacting adjustments.
> 
>    Regards,
> 
>    Chris Chapman
>
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Subject: Re: optimal position of magnetic dampter
From: ChrisAtUpw@.......
Date: Tue, 2 Jun 2009 11:22:35 EDT

 
In a message dated 02/06/2009, gmvoeth@........... writes:

Do you  really mean Q of 0.7
Which is a Damping of 1/0.7 ?

If I make a  filter with a damping of only 0.7 I get a peak in
the roll off response  instead of a Butterworth profile ?



Hi Geoff,
 
    You set the damping of a Lehman to 0.7 x  Critical value and also on a 
geophone.
    You are providing a force from the frame to the  mass which is LESS 
than that required to damp it fully.
    This gives about the best compromise for  the response amplitude / low 
frequency corner. The rise in the  characteristic is only just visable. 
    You loose signal amplitude rapidly as you increase  the damping over 1.
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16825" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 02/06/2009, gmvoeth@........... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>Do you 
  really mean Q of 0.7<BR>Which is a Damping of 1/0.7 ?<BR><BR>If I make=
 a 
  filter with a damping of only 0.7 I get a peak in<BR>the roll off respon=
se 
  instead of a Butterworth profile ?<BR></FONT></BLOCKQUOTE></DIV>
<DIV></DIV>
<DIV>Hi Geoff,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You set the damping of a Lehman to 0.7&nbsp;x=
 
Critical value and also on a geophone.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You are providing a force from the frame to=
 the 
mass which is LESS than that required to damp it&nbsp;fully.</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;This gives about the best compromise&nbsp;for=
 
the&nbsp;response amplitude&nbsp;/ low frequency corner. The rise in the=
 
characteristic is only just visable. </DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You loose signal amplitude rapidly as you inc=
rease 
the damping over 1.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Re: optimal position of magnetic dampter
From: "Geoffrey"  gmvoeth@........... 
Date: Tue, 2 Jun 2009 10:19:01 -0700

Chris;

I am currently using heavy damping to
help flatten my response because
my compensation circuit filters
like a LPF with a curve at like
10 seconds.

It seems if I amplify 1Hz to 80Dbv (x10000) I can
do almost anything I want and still get a
signal. Flatness of response is what I'm
looking for.

I am using a 470 ohm damping resistor
Split 50/50 between ground and +/- differential inputs.
for a single 450 ohm geophone.
This produces a current loop between the
geophone and amp that should override
the weaker noise.

I run the geophone coil straight into the diff amp
with no resistors in series.

I expect this to reduce overall gain by 1/2
plus geophone damping effect of raising
the point of roll off to over 1 Hz.

Is it possible to tell what the new
geophone curve is with such heavy damping ?

Thanks;
geoff



----- Original Message ----- 
From: <ChrisAtUpw@.......>
To: <psn-l@..............>
Sent: Tuesday, June 02, 2009 8:22 AM
Subject: Re: optimal position of magnetic dampter


> 
> In a message dated 02/06/2009, gmvoeth@........... writes:
> 
> Do you  really mean Q of 0.7
> Which is a Damping of 1/0.7 ?
> 
> If I make a  filter with a damping of only 0.7 I get a peak in
> the roll off response  instead of a Butterworth profile ?
> 
> 
> 
> Hi Geoff,
> 
>    You set the damping of a Lehman to 0.7 x  Critical value and also on a 
> geophone.
>    You are providing a force from the frame to the  mass which is LESS 
> than that required to damp it fully.
>    This gives about the best compromise for  the response amplitude / low 
> frequency corner. The rise in the  characteristic is only just visable. 
>    You loose signal amplitude rapidly as you increase  the damping over 1.
> 
>    Regards,
> 
>    Chris Chapman
>
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Subject: Event file editor
From: Larry Conklin  lconklin@............ 
Date: Wed, 03 Jun 2009 10:40:36 -0400

A couple of weeks ago, someone asked whether there was a convenient way 
to edit spurious spikes out of an event data file.  Since I have the 
same problem, I decided to write a simple little program for editing 
PSNTYPE4 event data files.  The program prompts for the start and end 
times of the segment you want to edit and replaces the offending data 
samples with zeros.  Not very fancy, but it works.  If anyone would like 
a copy of the tool and/or the source code, I would be happy to send it 
to you.

Larry Conklin
Liverpool, NY
lconklin@............
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Subject: Re: Event file editor
From: Bob Hancock  icarus@......... 
Date: Wed, 3 Jun 2009 08:15:18 -0700

Sounds nice, but what is the logic that you are using to determine it  
is a "spike" and not a seismic wave?  In addition a "spike" may be  
simultaneous with a seismic wave, how does the logic make a separation?

Bob Hancock


On Jun 3, 2009, at 7:40 AM, Larry Conklin wrote:

> A couple of weeks ago, someone asked whether there was a convenient  
> way to edit spurious spikes out of an event data file.  Since I have  
> the same problem, I decided to write a simple little program for  
> editing PSNTYPE4 event data files.  The program prompts for the  
> start and end times of the segment you want to edit and replaces the  
> offending data samples with zeros.  Not very fancy, but it works.   
> If anyone would like a copy of the tool and/or the source code, I  
> would be happy to send it to you.
>
> Larry Conklin
> Liverpool, NY
> lconklin@............
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with the body  
> of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>

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Subject: Re: Event file editor
From: Larry Conklin  lconklin@............ 
Date: Wed, 03 Jun 2009 11:45:05 -0400

Hi Bob,

A spike is a spike in the eye of the beholder.  There is nothing 
automatic or analytical in the program.  I just look at the data in 
Winquake, and if there are obvious transients that I want to get rid of 
the tool gives me a convenient way to zero them out.  Most of the 
transients I want to eliminate are caused by my wife walking into the 
room directly above my sensor.  The result is a very large walk-up 
transient.  Since she only goes in there to feed the cat, I call these 
events "catastrophies".  There isn't any doubt about their legetimacy.

Larry


Bob Hancock wrote:
> Sounds nice, but what is the logic that you are using to determine it is 
> a "spike" and not a seismic wave?  In addition a "spike" may be 
> simultaneous with a seismic wave, how does the logic make a separation?
> 
> Bob Hancock
> 
> 
> On Jun 3, 2009, at 7:40 AM, Larry Conklin wrote:
> 
>> A couple of weeks ago, someone asked whether there was a convenient 
>> way to edit spurious spikes out of an event data file.  Since I have 
>> the same problem, I decided to write a simple little program for 
>> editing PSNTYPE4 event data files.  The program prompts for the start 
>> and end times of the segment you want to edit and replaces the 
>> offending data samples with zeros.  Not very fancy, but it works.  If 
>> anyone would like a copy of the tool and/or the source code, I would 
>> be happy to send it to you.
>>
>> Larry Conklin
>> Liverpool, NY
>> lconklin@............
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with the body of 
>> the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>
> 
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. withthe body of 
> the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
> 
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Subject: Re: Event file editor
From: Thomas Dick  dickthomas01@............. 
Date: Wed, 03 Jun 2009 11:12:43 -0500

I can see at least three instances where I can use this program. First, 
lightning strikes near the house. Second, walnuts falling off the tree 
and hitting the roof and patio outside the seismic units. Last, there 
seems to be some sort of flexing going on in the concrete floor or the 
house in general which is concrete with brick over it. It occurs more 
often in spring. The floor may be flexing due to change in temperature 
or change in water pressure. I live on a lake -- 25ft from the back 
door. The basement is below lake water level. My guess, as water is 
pumped out from under the concrete floor, it causes changes.
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Subject: Seismometer damping and period extension
From: Robert McClure  bobmcclure90@......... 
Date: Wed, 3 Jun 2009 12:58:20 -0400

Hi Geoff,

  Heavy damping is not the solution. You should adjust damping for a Q
of around 0.71, which gives the flattest response over the sensor
passband. From there, you have several options. You can use an analog
low pass filter as you suggest, but a true Butterworth design cannot
be realized without an inductive element in the circuit. A 10-second
cutoff second order low-pass filter applied to the HS-10 will yield a
flat response in the 1 to 10 second period range, but will result in
loss of signals higher than 1 Hz and a severe loss of overall
amplitude.

  The preferred analog solution is the Roberts circuit used by Chris
Chapman. It compensates for the roll-off in response beyond the
natural frequency and preserve high frequency response. You would be
better off abandoning your balanced input scheme. Use single-ended
signals. It will simplify implementation of the Roberts circuit.

  I have a digital solution, an inverse filter implemented in my
WQFilter utility program. Its gain curve compensates for the loss of
response for periods beyond the natural frequency, and can compensate
for over or under damping. It does nothing to improve whatever
signal-to-noise ratio you record at long periods, however. WQFilter
operates on WinQuake PSN Type 4 files. I know that you work with PSN
text files, but WinQuake will convert these to PSN Type 4. You can
download WQFilter from

  http://bobmcclure90.googlepages.com/winsac

  WQFilter has benefits for everyone with amateur sensors. I,
personally, would be lost without it. I recommend that all amateurs
look up my web site, read all about WQFilter, and give it a try.

  I also urge everyone who uses WinQuake to download the latest version from

  http://www.seismicnet.com/software.html#WinQuake

  Those who submit multiple event files should learn how to use
WinQuake to make volume files, as well.

---Bob

On 2 Jun 2009, Geoff wrote:
I am currently using heavy damping to
help flatten my response because
my compensation circuit filters
like a LPF with a curve at like
10 seconds.

It seems if I amplify 1Hz to 80Dbv (x10000) I can
do almost anything I want and still get a
signal. Flatness of response is what I'm
looking for.

I am using a 470 ohm damping resistor
Split 50/50 between ground and +/- differential inputs.
for a single 450 ohm geophone.
This produces a current loop between the
geophone and amp that should override
the weaker noise.

I run the geophone coil straight into the diff amp
with no resistors in series.

I expect this to reduce overall gain by 1/2
plus geophone damping effect of raising
the point of roll off to over 1 Hz.

Is it possible to tell what the new
geophone curve is with such heavy damping ?
====
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Subject: Re: Event file editor
From: "Geoffrey"  gmvoeth@........... 
Date: Wed, 3 Jun 2009 14:55:44 -0700

I would think if you are serious as scientist
you keep the raw file
as it originally was even with the flaws.
Any modification to the data renders it
useless of most scientific value by
creating a subjective work of art.

But the tool might be useful such as before doing an fft
by getting rid of cal marks or such.


----- Original Message ----- 
From: "Larry Conklin" <lconklin@............>
To: "PSN List" <PSN-L@..............>
Sent: Wednesday, June 03, 2009 7:40 AM
Subject: Event file editor


>A couple of weeks ago, someone asked whether there was a convenient way 
> to edit spurious spikes out of an event data file.  Since I have the 
> same problem, I decided to write a simple little program for editing 
> PSNTYPE4 event data files.  The program prompts for the start and end 
> times of the segment you want to edit and replaces the offending data 
> samples with zeros.  Not very fancy, but it works.  If anyone would like 
> a copy of the tool and/or the source code, I would be happy to send it 
> to you.
> 
> Larry Conklin
> Liverpool, NY
> lconklin@............
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
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Subject: Re: Event file editor
From: "tchannel"  tchannel@............ 
Date: Wed, 3 Jun 2009 16:25:16 -0600

Hi Folks,  I tried Larry's program and it works very well.   There are times 
when I get  a spike, and I would like to remove it.   This is a neat tool, 
for me.   Thanks Larry.
Ted


----- Original Message ----- 
From: "Larry Conklin" <lconklin@............>
To: <psn-l@..............>
Sent: Wednesday, June 03, 2009 9:45 AM
Subject: Re: Event file editor


> Hi Bob,
>
> A spike is a spike in the eye of the beholder.  There is nothing automatic 
> or analytical in the program.  I just look at the data in Winquake, and if 
> there are obvious transients that I want to get rid of the tool gives me a 
> convenient way to zero them out.  Most of the transients I want to 
> eliminate are caused by my wife walking into the room directly above my 
> sensor.  The result is a very large walk-up transient.  Since she only 
> goes in there to feed the cat, I call these events "catastrophies".  There 
> isn't any doubt about their legetimacy.
>
> Larry
>
>
> Bob Hancock wrote:
>> Sounds nice, but what is the logic that you are using to determine it is 
>> a "spike" and not a seismic wave?  In addition a "spike" may be 
>> simultaneous with a seismic wave, how does the logic make a separation?
>>
>> Bob Hancock
>>
>>
>> On Jun 3, 2009, at 7:40 AM, Larry Conklin wrote:
>>
>>> A couple of weeks ago, someone asked whether there was a convenient way 
>>> to edit spurious spikes out of an event data file.  Since I have the 
>>> same problem, I decided to write a simple little program for editing 
>>> PSNTYPE4 event data files.  The program prompts for the start and end 
>>> times of the segment you want to edit and replaces the offending data 
>>> samples with zeros.  Not very fancy, but it works.  If anyone would like 
>>> a copy of the tool and/or the source code, I would be happy to send it 
>>> to you.
>>>
>>> Larry Conklin
>>> Liverpool, NY
>>> lconklin@............
>>> __________________________________________________________
>>>
>>> Public Seismic Network Mailing List (PSN-L)
>>>
>>> To leave this list email PSN-L-REQUEST@.............. with the body of 
>>> the message (first line only): unsubscribe
>>> See http://www.seismicnet.com/maillist.html for more information.
>>>
>>
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. withthe body of the 
>> message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>
> __________________________________________________________
>
> Public Seismic Network Mailing List (PSN-L)
>
> To leave this list email PSN-L-REQUEST@.............. with the body of the 
> message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information. 

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Subject: Re: Event file editor
From: Larry Conklin  lconklin@............ 
Date: Wed, 03 Jun 2009 20:16:53 -0400

Well, the program saves the original file as a .BAK and creates an 
edited version with the original file name.  So you get to eat your cake 
and archive it too, if that is what you want.  I make no allusions that 
my data has any significant scientific value.

Larry


Geoffrey wrote:
> I would think if you are serious as scientist
> you keep the raw file
> as it originally was even with the flaws.
> Any modification to the data renders it
> useless of most scientific value by
> creating a subjective work of art.
> 
> But the tool might be useful such as before doing an fft
> by getting rid of cal marks or such.
> 
> 
> ----- Original Message ----- From: "Larry Conklin" <lconklin@............>
> To: "PSN List" <PSN-L@..............>
> Sent: Wednesday, June 03, 2009 7:40 AM
> Subject: Event file editor
> 
> 
>> A couple of weeks ago, someone asked whether there was a convenient 
>> way to edit spurious spikes out of an event data file.  Since I have 
>> the same problem, I decided to write a simple little program for 
>> editing PSNTYPE4 event data files.  The program prompts for the start 
>> and end times of the segment you want to edit and replaces the 
>> offending data samples with zeros.  Not very fancy, but it works.  If 
>> anyone would like a copy of the tool and/or the source code, I would 
>> be happy to send it to you.
>>
>> Larry Conklin
>> Liverpool, NY
>> lconklin@............
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with the body of 
>> the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with the body of 
> the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
> 
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Subject: Volcano activity starting on the Reykjanes or Reykjanes ridge ?
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Thu, 04 Jun 2009 00:49:43 +0000

Hi all

There is a intersting earquake activity going on the Reykjanes ridge
right now. The activity on that ridge has been incresing since the Mw
4,9 earthquake the other day.

Currently I am seeing a lot of activity on the Reykjanes ridge part that
is submerged in ocean. There are volcanoes there. It was last active
around 1830 according to historical documents.

It is worth keeping a eye out of if you are interested in possible
volcano activity.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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Subject: Re: Event file editor
From: Barry Lotz  barry_lotz@............. 
Date: Wed, 3 Jun 2009 18:45:47 -0700 (PDT)

I don't see much scientific value in non-seismic or non-geologic signals. I=
 prefer to remove structure or man made noise, for example, from my recordi=
ngs. As I see it , the sensor response is also not necessarily what the ear=
th is doing at ones location. The scientific value that I see is how to rem=
ove the transients without editing the signal.=20
Barry


--- On Wed, 6/3/09, Geoffrey <gmvoeth@...........> wrote:

From: Geoffrey <gmvoeth@...........>
Subject: Re: Event file editor
To: psn-l@..............
Date: Wednesday, June 3, 2009, 2:55 PM

I would think if you are serious as scientist
you keep the raw file
as it originally was even with the flaws.
Any modification to the data renders it
useless of most scientific value by
creating a subjective work of art.

But the tool might be useful such as before doing an fft
by getting rid of cal marks or such.


----- Original Message ----- From: "Larry Conklin" <lconklin@............>
To: "PSN List" <PSN-L@..............>
Sent: Wednesday, June 03, 2009 7:40 AM
Subject: Event file editor


> A couple of weeks ago, someone asked whether there was a convenient way t=
o edit spurious spikes out of an event data file.=A0 Since I have the same =
problem, I decided to write a simple little program for editing PSNTYPE4 ev=
ent data files.=A0 The program prompts for the start and end times of the s=
egment you want to edit and replaces the offending data samples with zeros.=
=A0 Not very fancy, but it works.=A0 If anyone would like a copy of the too=
l and/or the source code, I would be happy to send it to you.
>=20
> Larry Conklin
> Liverpool, NY
> lconklin@............
> __________________________________________________________
>=20
> Public Seismic Network Mailing List (PSN-L)
>=20
> To leave this list email PSN-L-REQUEST@.............. with the body of th=
e message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>=20
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<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;">I don't see much scientific value in non-seis=
mic or non-geologic signals. I prefer to remove structure or man made noise=
, for example, from my recordings. As I see it , the sensor response is als=
o not necessarily what the earth is doing at ones location. The scientific =
value that I see is how to remove the transients without editing the signal=
.. <br>Barry<br><br><br>--- On <b>Wed, 6/3/09, Geoffrey <i>&lt;gmvoeth@hotma=
il.com&gt;</i></b> wrote:<br><blockquote style=3D"border-left: 2px solid rg=
b(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: Geoffrey &l=
t;gmvoeth@...........&gt;<br>Subject: Re: Event file editor<br>To: psn-l@we=
btronics.com<br>Date: Wednesday, June 3, 2009, 2:55 PM<br><br><div class=3D=
"plainMail">I would think if you are serious as scientist<br>you keep the r=
aw file<br>as it originally was even with the flaws.<br>Any modification to=
 the
 data renders it<br>useless of most scientific value by<br>creating a subje=
ctive work of art.<br><br>But the tool might be useful such as before doing=
 an fft<br>by getting rid of cal marks or such.<br><br><br>----- Original M=
essage ----- From: "Larry Conklin" &lt;<a ymailto=3D"mailto:lconklin@.......
rr.com" href=3D"/mc/compose?to=3Dlconklin@............">lconklin@...........
om</a>&gt;<br>To: "PSN List" &lt;<a ymailto=3D"mailto:PSN-L@.............."=
 href=3D"/mc/compose?to=3DPSN-L@..............">PSN-L@..............</a>&gt=
;<br>Sent: Wednesday, June 03, 2009 7:40 AM<br>Subject: Event file editor<b=
r><br><br>&gt; A couple of weeks ago, someone asked whether there was a con=
venient way to edit spurious spikes out of an event data file.&nbsp; Since =
I have the same problem, I decided to write a simple little program for edi=
ting PSNTYPE4 event data files.&nbsp; The program prompts for the start and=
 end times of the segment you want to edit and replaces the offending data
 samples with zeros.&nbsp; Not very fancy, but it works.&nbsp; If anyone wo=
uld like a copy of the tool and/or the source code, I would be happy to sen=
d it to you.<br>&gt; <br>&gt; Larry Conklin<br>&gt; Liverpool, NY<br>&gt; <=
a ymailto=3D"mailto:lconklin@............" href=3D"/mc/compose?to=3Dlconkli=
n@............">lconklin@............</a><br>&gt; _________________________=
_________________________________<br>&gt; <br>&gt; Public Seismic Network M=
ailing List (PSN-L)<br>&gt; <br>&gt; To leave this list email <a ymailto=3D=
"mailto:PSN-L-REQUEST@.............." href=3D"/mc/compose?to=3DPSN-L-REQUES=
T@..............">PSN-L-REQUEST@..............</a> with the body of the mes=
sage (first line only): unsubscribe<br>&gt; See <a href=3D"http://www.seism=
icnet.com/maillist.html" target=3D"_blank">http://www.seismicnet.com/mailli=
st.html</a> for more information.<br>&gt; <br>_____________________________=
_____________________________<br><br>Public Seismic Network Mailing List
 (PSN-L)<br><br>To leave this list email <a ymailto=3D"mailto:PSN-L-REQUEST=
@.............." href=3D"/mc/compose?to=3DPSN-L-REQUEST@..............">PSN=
-L-REQUEST@..............</a> with the body of the message (first line only=
): unsubscribe<br>See <a href=3D"http://www.seismicnet.com/maillist.html" t=
arget=3D"_blank">http://www.seismicnet.com/maillist.html</a> for more infor=
mation.<br></div></blockquote></td></tr></table>

Subject: RE: Event file editor
From: "Steve Hammond"  shammon1@............. 
Date: Thu, 4 Jun 2009 22:40:04 -0700

Over the years when working with different folks from the USGS in every case
they have asked for a raw dataset with no edits and no filters. They also
wanted non event data on both sides of the event. For simple local events
that lasted just a few seconds we have supplied them with apx three min
worth of raw data. 
Regards, Steve Hammond PSN San Jose, Aptos California

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Larry Conklin
Sent: Wednesday, June 03, 2009 5:17 PM
To: psn-l@..............
Subject: Re: Event file editor

Well, the program saves the original file as a .BAK and creates an 
edited version with the original file name.  So you get to eat your cake 
and archive it too, if that is what you want.  I make no allusions that 
my data has any significant scientific value.

Larry


Geoffrey wrote:
> I would think if you are serious as scientist
> you keep the raw file
> as it originally was even with the flaws.
> Any modification to the data renders it
> useless of most scientific value by
> creating a subjective work of art.
> 
> But the tool might be useful such as before doing an fft
> by getting rid of cal marks or such.
> 
> 
> ----- Original Message ----- From: "Larry Conklin" <lconklin@............>
> To: "PSN List" <PSN-L@..............>
> Sent: Wednesday, June 03, 2009 7:40 AM
> Subject: Event file editor
> 
> 
>> A couple of weeks ago, someone asked whether there was a convenient 
>> way to edit spurious spikes out of an event data file.  Since I have 
>> the same problem, I decided to write a simple little program for 
>> editing PSNTYPE4 event data files.  The program prompts for the start 
>> and end times of the segment you want to edit and replaces the 
>> offending data samples with zeros.  Not very fancy, but it works.  If 
>> anyone would like a copy of the tool and/or the source code, I would 
>> be happy to send it to you.
>>
>> Larry Conklin
>> Liverpool, NY
>> lconklin@............
>> __________________________________________________________
>>
>> Public Seismic Network Mailing List (PSN-L)
>>
>> To leave this list email PSN-L-REQUEST@.............. with the body of 
>> the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>>
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with the body of 
> the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
> 
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Subject: Re: Event file editor
From: "Geoffrey"  gmvoeth@........... 
Date: Sat, 6 Jun 2009 11:13:23 -0700

Wunderbar;

I just love to have my Kate and Edith too.

:-)


----- Original Message ----- 
From: "Steve Hammond" <shammon1@.............>
To: <psn-l@..............>
Sent: Thursday, June 04, 2009 10:40 PM
Subject: RE: Event file editor


> Over the years when working with different folks from the USGS in every case
> they have asked for a raw dataset with no edits and no filters. They also
> wanted non event data on both sides of the event. For simple local events
> that lasted just a few seconds we have supplied them with apx three min
> worth of raw data. 
> Regards, Steve Hammond PSN San Jose, Aptos California
> 
> -----Original Message-----
> From: psn-l-request@.............. [mailto:psn-l-request@............... On
> Behalf Of Larry Conklin
> Sent: Wednesday, June 03, 2009 5:17 PM
> To: psn-l@..............
> Subject: Re: Event file editor
> 
> Well, the program saves the original file as a .BAK and creates an 
> edited version with the original file name.  So you get to eat your cake 
> and archive it too, if that is what you want.  I make no allusions that 
> my data has any significant scientific value.
> 
> Larry
> 
> 
> Geoffrey wrote:
>> I would think if you are serious as scientist
>> you keep the raw file
>> as it originally was even with the flaws.
>> Any modification to the data renders it
>> useless of most scientific value by
>> creating a subjective work of art.
>> 
>> But the tool might be useful such as before doing an fft
>> by getting rid of cal marks or such.
>> 
>> 
>> ----- Original Message ----- From: "Larry Conklin" <lconklin@............>
>> To: "PSN List" <PSN-L@..............>
>> Sent: Wednesday, June 03, 2009 7:40 AM
>> Subject: Event file editor
>> 
>> 
>>> A couple of weeks ago, someone asked whether there was a convenient 
>>> way to edit spurious spikes out of an event data file.  Since I have 
>>> the same problem, I decided to write a simple little program for 
>>> editing PSNTYPE4 event data files.  The program prompts for the start 
>>> and end times of the segment you want to edit and replaces the 
>>> offending data samples with zeros.  Not very fancy, but it works.  If 
>>> anyone would like a copy of the tool and/or the source code, I would 
>>> be happy to send it to you.
>>>
>>> Larry Conklin
>>> Liverpool, NY
>>> lconklin@............
>>> __________________________________________________________
>>>
>>> Public Seismic Network Mailing List (PSN-L)
>>>
>>> To leave this list email PSN-L-REQUEST@.............. with the body of 
>>> the message (first line only): unsubscribe
>>> See http://www.seismicnet.com/maillist.html for more information.
>>>
>> __________________________________________________________
>> 
>> Public Seismic Network Mailing List (PSN-L)
>> 
>> To leave this list email PSN-L-REQUEST@.............. with the body of 
>> the message (first line only): unsubscribe
>> See http://www.seismicnet.com/maillist.html for more information.
>> 
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
> 
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
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Subject: Focal Mech Balls
From: "Kareem Lanier"  system98765@............. 
Date: Sun, 7 Jun 2009 22:39:14 -0700

Can someone help explain how to read these first motion focal mechanism
diagram balls? I have always seen these but was not able to decipher them
too well.

http://quake.wr.usgs.gov/recenteqs/QuakeAddons/nc40237749.ncfm1.html





------------------
Kareem J. Lanier
El Sobrante, California (N37.96 W122.32)
East Bay Area Region

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Subject: Re: Focal Mech Balls
From: Dave Nelson  dave.nelson@............... 
Date: Mon, 08 Jun 2009 15:48:01 +1000

Hi Kareem,
                   I have a starter on my www pages that I did some years ago
   it came out of my studies for my BSc in Geology during the 1990's

http://www.sydneystormcity.com/fomec.htm

   its a starting point for you   :)

Dave N
Sydney

At 10:39 PM 6/7/2009 -0700, you wrote:
>Can someone help explain how to read these first motion focal mechanism
>diagram balls? I have always seen these but was not able to decipher them
>too well.
>
>http://quake.wr.usgs.gov/recenteqs/QuakeAddons/nc40237749.ncfm1.html
>------------------
>Kareem J. Lanier
>El Sobrante, California (N37.96 W122.32)
>East Bay Area Region

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Subject: Placing Geophone on Negative Feedback leg of op amp
From: "Geoffrey"  gmvoeth@........... 
Date: Tue, 9 Jun 2009 17:20:48 -0700

Hello Chris;

I tried the technique you suggested and
in preliminary testing I believe I received
a recent Alaska teleseismic quake of
4.1 at 38 degrees. It was deep ( 131Km )
and only barely perceptible using audacity
to hear it and Winquake to filter/integrate
the results. This is the weakest signal received
by me that I could still say it was some kind
of earth quake.

http://earthquake.usgs.gov/eqcenter/recenteqsus/Quakes/ak00108399.php


I could never say 100% it is in fact an Eq yet
the frequency range and time of arrival
( within 2 to 3 seconds of theoretical )
suggests to me it was in fact the Alaska event.
ARRIVAL TIME here: 18:46:21_2009JUN09_UTC
I was not able to use this idea before because
of drift with high gain but since using a DC
blocker (HPF) your idea has been working.

Placing the geophone between ground and the negative
input of the preamp/LPF with a 100K feedback resistor
gives about x228 of gain in the preamp for this setup.

Thanks for the recommendation.

Regards
geoff

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Subject: Minor changes to my lehman seismomter
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Thu, 11 Jun 2009 01:02:10 +0000

Hi all

I did make some final changes to my lehman seismometer. The basic for
this change was to make the arm movement stable, but I found out that
the other setup was unstable when I got 12 second period. The current
setup gives me 12 second period with out issues.

Here are pictures of the changes.

http://www.jonfr.com/myndir/v/geology/lehman/p6110001.jpg.html

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

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Subject: RE: Pen needed for Kinemetrics PS2
From: Pete Rowe  ptrowe@......... 
Date: Wed, 10 Jun 2009 20:34:53 -0700 (PDT)

Hi Kareem
I haven't forgotten to send the ink to you. I have just been too busy to pa=
ck it up and ship it.
I have a nice Esterline Angus chart recorder with paper and pens that you c=
an have if you come to San Jose to pick it up. I ran it in my early seismom=
eter days. Now I'm all computerized.
I have house guests arriving Friday and another set arriving Monday. I will=
 get the ink to you in a week or so.
Pete

--- On Tue, 5/5/09, Kareem Lanier <system98765@.............> wrote:

From: Kareem Lanier <system98765@.............>
Subject: RE: Pen needed for Kinemetrics PS2
To: psn-l@..............
Date: Tuesday, May 5, 2009, 8:14 AM

This sounds like a good idear too.

What kind of ink should I get and from where should I obtain it?

=20

-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Barry Lotz
Sent: Monday, April 27, 2009 7:38 PM
To: psn-l@..............
Subject: RE: Pen needed for Kinemetrics PS2

Kareem
Someone told me years ago to add a little glycerin to the ink to increase
the ink drying time and prevent clogging. I haven't tried it.
Regards
Barry


--- On Sun, 4/26/09, Kareem Lanier <system98765@.............> wrote:


=A0=A0=A0 From: Kareem Lanier <system98765@.............>
=A0=A0=A0 Subject: RE: Pen needed for Kinemetrics PS2
=A0=A0=A0 To: psn-l@..............
=A0=A0=A0 Date: Sunday, April 26, 2009, 7:58 AM
=A0=A0=A0=20
=A0=A0=A0=20
=A0=A0=A0 Thanks for your replies..
=A0=A0=A0=20
=A0=A0=A0 I would love to get the cleaning fluid and wire. Where would one
find such
=A0=A0=A0 materials? What's "OD?"
=A0=A0=A0=A0=A0
=A0=A0=A0=20
=A0=A0=A0 -----Original Message-----
=A0=A0=A0 From: psn-l-request@..............
[mailto:psn-l-request@............... On
=A0=A0=A0 Behalf Of ChrisAtUpw@.......
=A0=A0=A0 Sent: Saturday, April
=A0=A0=A0=A0=A025, 2009 11:03 AM
=A0=A0=A0 To: psn-l@..............
=A0=A0=A0 Subject: Re: Pen needed for Kinemetrics PS2
=A0=A0=A0=20
=A0=A0=A0 In a message dated 25/04/2009, system98765@............. writes:
=A0=A0=A0=20
=A0=A0=A0 =A0=A0=A0 IT's a kinemetrics PS2 system and I need a new pen for =
it. I
can't
=A0=A0=A0 seem to get a new pen from any viable sources. The manufacturer
wants to
=A0=A0=A0 charge an enormous amount of money. I wasn't sure if anyone knew =
how
to
=A0=A0=A0 make
=A0=A0=A0 one or point me in that direction. It just looks like a metal tub=
e
(very,
=A0=A0=A0 very small) that has a bend in it so that makes contact with the
paper.
=A0=A0=A0 =A0=A0=A0=20
=A0=A0=A0=20
=A0=A0=A0 Hi Kareem,
=A0=A0=A0=A0=A0
=A0=A0=A0 =A0 =A0 What is the matter with your existing pen? You can buy a =
special
=A0=A0=A0 cleaning fluid for capillary pens. You can also buy fine wire for
cleaning
=A0=A0=A0 out small tubes. I usually use fine piano wire or hard Nichrome
wire, ground
=A0=A0=A0 to a diagonal knife end. If you have a problem in getting cleanin=
g
fluid,
=A0=A0=A0 look for paint stripper fluid containing Methylene Chloride.
=A0=A0=A0 =A0 =A0 I can buy
=A0=A0=A0=A0=A0very small bore SS tube quite easily. What is the OD of your
=A0=A0=A0 existing tube?=20
=A0=A0=A0=A0=A0
=A0=A0=A0 =A0 =A0 Regards,
=A0=A0=A0=A0=A0
=A0=A0=A0 =A0 =A0 Chris Chapman
=A0=A0=A0=20
=A0=A0=A0 __________________________________________________________
=A0=A0=A0=20
=A0=A0=A0 Public Seismic Network Mailing List (PSN-L)
=A0=A0=A0=20
=A0=A0=A0 To leave this list email PSN-L-REQUEST@.............. with=20
=A0=A0=A0 the body of the message (first line only): unsubscribe
=A0=A0=A0 See http://www.seismicnet.com/maillist.html for more information.


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

=0A=0A=0A      
<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;">Hi Kareem<br>I haven't forgotten to send the =
ink to you. I have just been too busy to pack it up and ship it.<br>I have =
a nice Esterline Angus chart recorder with paper and pens that you can have=
 if you come to San Jose to pick it up. I ran it in my early seismometer da=
ys. Now I'm all computerized.<br>I have house guests arriving Friday and an=
other set arriving Monday. I will get the ink to you in a week or so.<br>Pe=
te<br><br>--- On <b>Tue, 5/5/09, Kareem Lanier <i>&lt;system98765@heyjoojoo=
..com&gt;</i></b> wrote:<br><blockquote style=3D"border-left: 2px solid rgb(=
16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: Kareem Lanier=
 &lt;system98765@.............&gt;<br>Subject: RE: Pen needed for Kinemetri=
cs PS2<br>To: psn-l@..............<br>Date: Tuesday, May 5, 2009, 8:14 AM<b=
r><br><div class=3D"plainMail">This sounds like a good idear too.<br><br>Wh=
at kind
 of ink should I get and from where should I obtain it?<br><br> <br><br>---=
--Original Message-----<br>From: <a ymailto=3D"mailto:psn-l-request@webtron=
ics.com" href=3D"/mc/compose?to=3Dpsn-l-request@..............">psn-l-reque=
st@..............</a> [mailto:<a ymailto=3D"mailto:psn-l-request@webtronics=
..com" href=3D"/mc/compose?to=3Dpsn-l-request@..............">psn-l-request@=
webtronics.com</a>] On<br>Behalf Of Barry Lotz<br>Sent: Monday, April 27, 2=
009 7:38 PM<br>To: <a ymailto=3D"mailto:psn-l@.............." href=3D"/mc/c=
ompose?to=3Dpsn-l@..............">psn-l@..............</a><br>Subject: RE: =
Pen needed for Kinemetrics PS2<br><br>Kareem<br>Someone told me years ago t=
o add a little glycerin to the ink to increase<br>the ink drying time and p=
revent clogging. I haven't tried it.<br>Regards<br>Barry<br><br><br>--- On =
Sun, 4/26/09, Kareem Lanier &lt;<a ymailto=3D"mailto:system98765@...........
com" href=3D"/mc/compose?to=3Dsystem98765@.............">system98765@heyjoo=
joo.com</a>&gt;
 wrote:<br><br><br>&nbsp;&nbsp;&nbsp; From: Kareem Lanier &lt;<a ymailto=3D=
"mailto:system98765@............." href=3D"/mc/compose?to=3Dsystem98765@hey=
joojoo.com">system98765@.............</a>&gt;<br>&nbsp;&nbsp;&nbsp; Subject=
: RE: Pen needed for Kinemetrics PS2<br>&nbsp;&nbsp;&nbsp; To: <a ymailto=
=3D"mailto:psn-l@.............." href=3D"/mc/compose?to=3Dpsn-l@............
com">psn-l@..............</a><br>&nbsp;&nbsp;&nbsp; Date: Sunday, April 26,=
 2009, 7:58 AM<br>&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp=
;&nbsp; Thanks for your replies..<br>&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nb=
sp; I would love to get the cleaning fluid and wire. Where would one<br>fin=
d such<br>&nbsp;&nbsp;&nbsp; materials? What's "OD?"<br>&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;<br>&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nbsp; -----Original Mess=
age-----<br>&nbsp;&nbsp;&nbsp; From: <a ymailto=3D"mailto:psn-l-request@web=
tronics.com"
 href=3D"/mc/compose?to=3Dpsn-l-request@..............">psn-l-request@webtr=
onics.com</a><br>[mailto:<a ymailto=3D"mailto:psn-l-request@.............."=
 href=3D"/mc/compose?to=3Dpsn-l-request@..............">psn-l-request@webtr=
onics.com</a>] On<br>&nbsp;&nbsp;&nbsp; Behalf Of <a ymailto=3D"mailto:Chri=
sAtUpw@......." href=3D"/mc/compose?to=3DChrisAtUpw@.......">ChrisAtUpw@aol=
..com</a><br>&nbsp;&nbsp;&nbsp; Sent: Saturday, April<br>&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;25, 2009 11:03 AM<br>&nbsp;&nbsp;&nbsp; To: <a ymailto=3D"mailto=
:psn-l@.............." href=3D"/mc/compose?to=3Dpsn-l@..............">psn-l=
@..............</a><br>&nbsp;&nbsp;&nbsp; Subject: Re: Pen needed for Kinem=
etrics PS2<br>&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nbsp; In a message dated =
25/04/2009, <a ymailto=3D"mailto:system98765@............." href=3D"/mc/com=
pose?to=3Dsystem98765@.............">system98765@.............</a> writes:<=
br>&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; IT's a kine=
metrics PS2 system
 and I need a new pen for it. I<br>can't<br>&nbsp;&nbsp;&nbsp; seem to get =
a new pen from any viable sources. The manufacturer<br>wants to<br>&nbsp;&n=
bsp;&nbsp; charge an enormous amount of money. I wasn't sure if anyone knew=
 how<br>to<br>&nbsp;&nbsp;&nbsp; make<br>&nbsp;&nbsp;&nbsp; one or point me=
 in that direction. It just looks like a metal tube<br>(very,<br>&nbsp;&nbs=
p;&nbsp; very small) that has a bend in it so that makes contact with the<b=
r>paper.<br>&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nbsp; <b=
r>&nbsp;&nbsp;&nbsp; Hi Kareem,<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<br>&nbsp;=
&nbsp;&nbsp; &nbsp; &nbsp; What is the matter with your existing pen? You c=
an buy a special<br>&nbsp;&nbsp;&nbsp; cleaning fluid for capillary pens. Y=
ou can also buy fine wire for<br>cleaning<br>&nbsp;&nbsp;&nbsp; out small t=
ubes. I usually use fine piano wire or hard Nichrome<br>wire, ground<br>&nb=
sp;&nbsp;&nbsp; to a diagonal knife end. If you have a problem in
 getting cleaning<br>fluid,<br>&nbsp;&nbsp;&nbsp; look for paint stripper f=
luid containing Methylene Chloride.<br>&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; I c=
an buy<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;very small bore SS tube quite easil=
y. What is the OD of your<br>&nbsp;&nbsp;&nbsp; existing tube? <br>&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;<br>&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; Regards,<br>&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;<br>&nbsp;&nbsp;&nbsp; &nbsp; &nbsp; Chris Chapma=
n<br>&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nbsp; ____________________________=
______________________________<br>&nbsp;&nbsp;&nbsp; <br>&nbsp;&nbsp;&nbsp;=
 Public Seismic Network Mailing List (PSN-L)<br>&nbsp;&nbsp;&nbsp; <br>&nbs=
p;&nbsp;&nbsp; To leave this list email <a ymailto=3D"mailto:PSN-L-REQUEST@=
SEISMICNET.COM" href=3D"/mc/compose?to=3DPSN-L-REQUEST@..............">PSN-=
L-REQUEST@..............</a> with <br>&nbsp;&nbsp;&nbsp; the body of the me=
ssage (first line only): unsubscribe<br>&nbsp;&nbsp;&nbsp; See <a
 href=3D"http://www.seismicnet.com/maillist.html" target=3D"_blank">http://=
www.seismicnet.com/maillist.html</a> for more information.<br><br><br>_____=
_____________________________________________________<br><br>Public Seismic=
 Network Mailing List (PSN-L)<br><br>To leave this list email <a ymailto=3D=
"mailto:PSN-L-REQUEST@.............." href=3D"/mc/compose?to=3DPSN-L-REQUES=
T@..............">PSN-L-REQUEST@..............</a> with <br>the body of the=
 message (first line only): unsubscribe<br>See <a href=3D"http://www.seismi=
cnet.com/maillist.html" target=3D"_blank">http://www.seismicnet.com/maillis=
t.html</a> for more information.<br></div></blockquote></td></tr></table><b=
r>=0A=0A=0A=0A      

Subject: RE: Pen needed for Kinemetrics PS2
From: "Kareem Lanier"  system98765@............. 
Date: Wed, 10 Jun 2009 20:48:02 -0700

Hi Pete,

Thanks so much. I'm totally patient and will be absolutely willing to drive
to San Jose to pick up the ink and the chart recorder. 
That is very nice of you.  

Kareem


-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Pete Rowe
Sent: Wednesday, June 10, 2009 8:35 PM
To: psn-l@..............
Subject: RE: Pen needed for Kinemetrics PS2

Hi Kareem
I haven't forgotten to send the ink to you. I have just been too busy to
pack it up and ship it.
I have a nice Esterline Angus chart recorder with paper and pens that you
can have if you come to San Jose to pick it up. I ran it in my early
seismometer days. Now I'm all computerized.
I have house guests arriving Friday and another set arriving Monday. I will
get the ink to you in a week or so.
Pete

--- On Tue, 5/5/09, Kareem Lanier <system98765@.............> wrote:



	From: Kareem Lanier <system98765@.............>
	Subject: RE: Pen needed for Kinemetrics PS2
	To: psn-l@..............
	Date: Tuesday, May 5, 2009, 8:14 AM
	
	
	This sounds like a good idear too.
	
	What kind of ink should I get and from where should I obtain it?
	
	
	
	-----Original Message-----
	From: psn-l-request@..............
[mailto:psn-l-request@............... On
	Behalf Of Barry Lotz
	Sent: Monday, April 27, 2009 7:38 PM
	To: psn-l@..............
	Subject: RE: Pen needed for Kinemetrics PS2
	
	Kareem
	Someone told me years ago to add a little glycerin to the ink to
increase
	the ink drying time and prevent clogging. I haven't tried it.
	Regards
	Barry
	
	
	--- On Sun, 4/26/09, Kareem Lanier <system98765@.............>
wrote:
	
	
	    From: Kareem Lanier <system98765@.............>
	    Subject: RE: Pen needed for Kinemetrics PS2
	    To: psn-l@..............
	    Date: Sunday, April 26, 2009, 7:58 AM
	    
	    
	    Thanks for your replies..
	    
	    I would love to get the cleaning fluid and wire. Where would one
	find such
	    materials? What's "OD?"
	     
	    
	    -----Original Message-----
	    From: psn-l-request@..............
	[mailto:psn-l-request@............... On
	    Behalf Of ChrisAtUpw@.......
	    Sent: Saturday, April
	     25, 2009 11:03 AM
	    To: psn-l@..............
	    Subject: Re: Pen needed for Kinemetrics PS2
	    
	    In a message dated 25/04/2009, system98765@............. writes:
	    
	        IT's a kinemetrics PS2 system and I need a new pen for it. I
	can't
	    seem to get a new pen from any viable sources. The manufacturer
	wants to
	    charge an enormous amount of money. I wasn't sure if anyone knew
how
	to
	    make
	    one or point me in that direction. It just looks like a metal
tube
	(very,
	    very small) that has a bend in it so that makes contact with the
	paper.
	        
	    
	    Hi Kareem,
	     
	        What is the matter with your existing pen? You can buy a
special
	    cleaning fluid for capillary pens. You can also buy fine wire
for
	cleaning
	    out small tubes. I usually use fine piano wire or hard Nichrome
	wire, ground
	    to a diagonal knife end. If you have a problem in getting
cleaning
	fluid,
	    look for paint stripper fluid containing Methylene Chloride.
	        I can buy
	     very small bore SS tube quite easily. What is the OD of your
	    existing tube? 
	     
	        Regards,
	     
	        Chris Chapman
	    
	    __________________________________________________________
	    
	    Public Seismic Network Mailing List (PSN-L)
	    
	    To leave this list email PSN-L-REQUEST@.............. with 
	    the body of the message (first line only): unsubscribe
	    See http://www.seismicnet.com/maillist.html for more
information.
	
	
	__________________________________________________________
	
	Public Seismic Network Mailing List (PSN-L)
	
	To leave this list email PSN-L-REQUEST@.............. with 
	the body of the message (first line only): unsubscribe
	See http://www.seismicnet.com/maillist.html for more information.
	



__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: PSN data files
From: =?ISO-8859-1?Q?J=F3n_Fr=EDmann?=  jonfr@......... 
Date: Fri, 12 Jun 2009 01:01:13 +0000

Hi all!

Is there a way to instert data from a text-file list into many PSN files
at once ? I ask because at current time I have around ~700 files to
short out and with out good program to update many files at once, it is
going to take me a long time to finish it. I do not know how many files
I am going to be left with unlocated earthquakes, but there are always
few in my experience. But this always happens after a big earthquake
swarm here in Iceland.

Regards.
--=20
J=F3n Fr=EDmann

http://www.jonfr.com

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Inertial wheel sensor ?
From: "Geoffrey"  gmvoeth@........... 
Date: Fri, 12 Jun 2009 19:22:45 -0700

Hello Folks;

Have any of you guys ever heard
of an inertia wheel sensor ?

Sort of like a gyroscope wheel
only it sets there still waiting
for tilt action or whatever.

Id have no ideas what kind of
bearings such a wheel should have
or how to mount a sensor. But
Id think such inertia arranged
in that manner might make a sensor.

I was just watching them build a
watch on tv and thought that
little spring balance wheel might somehow
make a seismic sensor or tilt meter.

geoff

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Inertia Wheel Sensor
From: Chuck/Judy Burch  cjburch@........... 
Date: Sat, 13 Jun 2009 08:51:22 -0600


Geoff,

A wheel with most of its mass at the rim has a large moment of inertia 
(the rotational analog of mass).  If it's mounted with the axis 
horizontal using a very low friction bearing, then it will tend to stay 
at rest if the local earth's surface tilts.  Morrissey constructed a 
balance beam tiltmeter that operated on the same principle.  It's 
described on his website.

Chuck Burch
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Seismic data filtering
From: Robert McClure  bobmcclure90@......... 
Date: Sun, 14 Jun 2009 21:31:56 -0400

Hi all,

  I am kind of a nut about preparing professional-looking event files,
and proper filtering is very important to me. I have given most of the
following discourse before, but I want to say it again.


MY THOUGHTS ON SEISMIC DATA FILTERING.

  On most seismic events, it is necessary to filter the raw data in
order to suppress cultural noise  to get a better view of the ground
motions of the event. First off, the sensor itself filters the data,
and the amplifier filters the sensor output. The digitization process
can also filter (and distort) the data. We can never truly sense
ground motion, but we can hope to reproduce accurately enough the data
of interest.

  Sensors of the force-feedback type are best for high fidelity
detection of ground motion. Most amateurs are limited to the use of
open loop pendulum types, such as the horizontal Lehman sensor and
vertical sensors of the spring supported pendulum type. Open loop
sensors can only accurately reproduce signals appreciably higher than
the natural resonant frequency of the pendulum. A signal at the
resonant frequency of the pendulum is shifted 90 degrees leading in
phase, and its amplitude is proportional to the Q of the system. Q is
inversely proportional to the damping factor, D. The relationship is Q
=3D 0.5/D. Critical damping occurs when D=3D1 or Q=3D0.5. Usual practice is
to adjust damping to a value of about 0.6, just low enough to sense a
little overshoot on the return of a displaced pendulum to equilibrium.
If you use more damping, you have little idea of how much it is, and
if you use less damping, you may get ringing on seismic signals. At
frequencies below resonance, the response falls off rapidly at a rate
of 12 decibels per octave, and the phase shift heads toward 180
degrees leading.

  One can infer from the above that one should strive for a pendulum
period longer than the longest period one wishes to reproduce.
However, the difficulty of achieving this goal goes up as the square
of the period. Horizontal sensors cannot distinguish the difference
between horizontal ground acceleration and ground tilt, and the
response to tilt goes up as the square of the period. Most amateurs do
not have a site really stable in tilt. The same can be said for
temperature stability. Temperature fluctuations can cause the sensor
to change its alignment, producing the same problems as ground tilt
changes.

  All this said, we amateurs just have to do the best we can with what
we have, but my signal processing utilities can make a lot of
improvement in the recorded data.

  After the sensor comes the amplifier, which must also attenuate high
frequency signal components to avoid aliasing at the subsequent
sampling and digitization steps. Less low pass filtering is needed the
higher the sampling rate. It is best to sample at a high rate, and
then sample average n data points taken at the high rate to get a
final sample rate 1/n times the input sample rate. My Dataq
acquisition system does that automatically for me. Its A/D samples at
240 samples per second overall. If I record three channels, each is
being sampled at a rate of 80 samples per second. I usually set my
recorded rate at 5 samples per second per channel, so the Dataq
recorder averages 16 data samples for each data point recorded. This
process largely avoids any aliasing, effectively suppresses high
frequency noise, and gives me 14 bit resolution out my 12-bit A/D.

  Once we have logged data, we still must usually digitally filter it
to suppress unwanted frequency components, both low frequencies and
high frequencies. However, filtering done inappropriately can really
mess up the waveform of the signal we want to preserve. WinQuake is a
marvelous program, grateful thanks to Larry Cochrane, and we would be
in the Dark Ages without it. However, it offers so many choices on
filtering that the na=EFve user has ample opportunity to do bad things.
I do not believe in ever using more than 4 poles in the filters, for
example. The more poles you use, the sharper the cutoff, the more the
signal is time delayed and distorted, and more ringing may occur. I
also prefer not to use WinQuake's causal Butterworth filter, which is
the only IIR choice offered. I prefer to use only the filters
implemented in my "WQFilter.exe" application. My filters are not
causal (i.e., operating only on present and past data, as analog
filters do), but operate on past, present, and future data to yield
the present filtered data point. What I do to achieve this is to
filter the data series forward in time in the usual manner, and then
apply the filter to that result again, but backward in time. This
results in output data that is undistorted in time and phase. To use a
photographic analogy, it softens the noise in a grainy picture by
defocusing it rather than smearing it. Most often, I use a 2nd order
Butterworth run forward and backward through the recorded time series
to yield a 4-pole zero lag filter. Its response is 6 dB down at the
corner frequency, and falls at the rate of 24 dB per octave for
frequencies outside the passband. It suppresses unwanted frequencies,
without much ringing.

  WinQuake also features FFT filtering, which is also non-causal and
yields zero lag and no phase distortion. I have tested its spectral
response, and it matches the classical Butterworth response. If you
use FFT filtering, I recommend no more than 2 or 4 poles.

  I have also developed a special digital filter for extending the
useful bandwidth of an open loop sensor to lower frequencies. It is
essentially a mathematically correct "bass boost" amplifier that
corrects for the fall off of response of the sensor to frequencies
below the natural period, and can even correct for the gain error
caused by damping. To get the correct output, the sensor's natural
period must be accurately known. The damping factor must also be
known, but it is not so critical. My vertical sensor has a period of
4.4 seconds. I routinely apply this filter to its data, to emulate the
output of a 32-second sensor. My horizontal sensors are adjusted to 8
and 13 seconds, respectively, and I routinely extend their period to
32 seconds. I get heliplots that closely resemble those displayed at
the nearby LDEO Palisades web site, which uses the expensive STS-2
force feedback sensor, but of course I show reduced amplitude on very
long period waves, and a lot more cultural noise. I use DC-coupled
amplifiers in order not to attenuate further the low amplitude low
frequency signal components. Along with the longer period performance
comes greater sensitivity to tilt from moving around my site and from
wind. I can't get away from that. What is very bad and troublesome at
times is that any spurious spikes in the data show up in the filtered
output as large transients, like someone tapped a long period
pendulum.

  I have developed a utility program called "WQFilter.exe" which can
be used to apply all my filters to WinQuake event files. Should you
want to experiment, you can get the latest version from page "WinQuake
and SAC Utility Programs". You should use the "LONG PERIOD Plus HPF"
option. It applies the period extending filter, followed by a backward
Butterworth high pass filter set to the same period as the period
extending filter. This results in better rejection of low frequency
noise, and very importantly, it eliminates all phase and time
distortion from the filtered record. To preserve time and phase on the
high frequency end of the spectrum, the low-pass filter should filter
in both time directions.

  Since it is very difficult to build open loop vertical sensors
having more than a few seconds natural period, my period extending
filter is practically a must for amateur vertical sensors. I would
encourage amateurs to acquire or build vertical sensors. They are much
better than horizontal sensors for detecting P waves. They do not
respond to ground tilt, so their signals are ideal for digital period
extension filtering.

Bob McClure
http://bobmcclure90.googlepages.com/home
Original July 2004
Revised August 2008, and June 2009
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: Seismic data filtering
From: ChrisAtUpw@.......
Date: Mon, 15 Jun 2009 18:12:56 EDT

In a message dated 15/06/2009, bobmcclure90@......... writes:

MY  THOUGHTS ON SEISMIC DATA FILTERING.

On most seismic events, it  is necessary to filter the raw data in order=
 to 
suppress cultural noise   to get a better view of the ground motions of th=
e 
event. First off, the sensor  itself filters the data,
and the amplifier filters the sensor output. The  digitization process can=
 
also filter (and distort) the data. We can never  truly sense ground motio=
n, 
but we can hope to reproduce accurately enough the  data of interest.

Sensors of the force-feedback type are best  for high fidelity detection=
 of 
ground motion. Most amateurs are limited to the  use of open loop pendulum=
 
types, such as the horizontal Lehman sensor and  vertical sensors of the=
 
spring supported pendulum type. Open loop sensors can  only accurately 
reproduce signals appreciably higher than the natural resonant  frequency=
 of the 
pendulum.
Hi Bob,
 
    Are you forgetting period extending amplifiers,  which can extend the=
 
response period by x10, fairly easily? I have extended the  period of an=
 AS1 
from 1.5 to 20 seconds quite OK this way. And it is a very  considerable=
 
improvement! The Roberts circuit can be used, provided that you  couple th=
e two 
stages with a two pole high pass filter to remove the long period  1/f 
noise. See _http://jclahr.com/science/psn/roberts/index.html_ 
(http://jclahr.com/science/psn/roberts/index.html) 

A signal  at the resonant frequency of the pendulum is shifted 90 degrees=
 
leading in  phase, and its amplitude is proportional to the Q of the syste=
m. 
Q is  inversely proportional to the damping factor, D. The relationship is=
 Q 
=3D  0.5/D. Critical damping occurs when D=3D1 or Q=3D0.5. Usual practice=
 is to 
adjust  damping to a value of about 0.6, just low enough to sense a little=
 
overshoot  on the return of a displaced pendulum to equilibrium. If you us=
e 
more damping,  you have little idea of how much it is, and if you use less=
 
damping, you may  get ringing on seismic signals. At frequencies below 
resonance, the response  falls off rapidly at a rate of 12 decibels per oc=
tave, and 
the phase shift  heads toward 180 degrees leading.
    With say a 3 cycle P wave, you are driving the  previously stationary=
 
inertial mass with a force a bit below that required to  produce critical=
 
damping eg 0.7, so any overshoot should be quite low.

One can infer from the above that one should strive for a pendulum period=
  
longer than the longest period one wishes to reproduce. However, the  
difficulty of achieving this goal goes up as the square
of the period.  Horizontal sensors cannot distinguish the difference 
between horizontal ground  acceleration and ground tilt, and the response=
 to tilt 
goes up as the square  of the period. Most amateurs do not have a site 
really stable in tilt. 
    WWSSN horizontal seismometers were designed for  periods of 30 seconds=
, 
but were usually run at periods of 15 seconds to ensure  that they did not=
 
drift out of the linear sense range between annual servicing.  I find it=
 
quite satisfactory to run my Lehman at 20 seconds. They still pick up  the=
 
occasional 40 second wave.

The same  can be said for temperature stability. Temperature fluctuations=
 
can cause the  sensor to change its alignment, producing the same problems=
 as 
ground tilt  changes.
    This depends on how well you design your  sensor. I have not found any=
 
significant thermal drift variations on my  Lehman. 

All this said, we amateurs just have to do the best we can with what we 
have,  but my signal processing utilities can make a lot of improvement in=
 the  
recorded data.

After the sensor comes the amplifier, which must  also attenuate high 
frequency signal components to avoid aliasing at the  subsequent sampling=
 and 
digitization steps. Less low pass filtering is needed  the higher the samp=
ling 
rate. It is best to sample at a high rate, and then  sample average n data=
 
points taken at the high rate to get a final sample rate  1/n times the in=
put 
sample rate. My Dataq acquisition system does that  automatically for me.=
 
Its A/D samples at 240 samples per second overall. If I  record three 
channels, each is being sampled at a rate of 80 samples per  second. I usu=
ally set 
my recorded rate at 5 samples per second per channel, so  the Dataq record=
er 
averages 16 data samples for each data point recorded. This  process 
largely avoids any aliasing, effectively suppresses high frequency  noise,=
 and 
gives me 14 bit resolution out my 12-bit A/D.
    I don't quite follow this. With a high sample rate  you will still hav=
e 
higher frequency components which you don't want in your  final data. This=
 
also rather depends on how the noise level in your ADC  responds to sampli=
ng 
rate changes. The 20 micro second ADCs typically had 3 bits  of noise. 16=
 
data samples would remove two bits of ADC noise. Some of the  sigma-delta=
 
types have only +/-1/2 LSB noise at the slower speeds.

Once we have logged data, we still must usually digitally filter it to  
suppress unwanted frequency components, both low frequencies and high  
frequencies. However, filtering done inappropriately can really mess up th=
e  
waveform of the signal we want to preserve. WinQuake is a marvellous progr=
am,  
grateful thanks to Larry Cochrane, and we would be in the Dark Ages withou=
t  it. 
However, it offers so many choices on filtering that the na=EFve user has=
  
ample opportunity to do bad things.
I do not  believe in ever using more than 4 poles in the filters, for 
example. The more  poles you use, the sharper the cut-off, the more the si=
gnal is 
time delayed  and distorted, and more ringing may occur.
    This mostly happens if you use Butterworth or  elliptic filters. Besse=
l 
filters seem to be OK, but I agree that you rarely need  more than 4th 
order filters. If you have been using a 10 Hz Butterworth filter,  you can=
 get 
roughly the same HF roll off by designing a Bessel filter for 7  Hz. It 
doesn't ring and there are no spiky signal delays at the band  edge! 

I also prefer not to use WinQuake's causal  Butterworth filter, which is=
 
the only IIR choice offered. I prefer to use only  the filters implemented=
 in 
my "WQFilter.exe" application. My filters are not  causal (i.e., operating=
 
only on present and past data, as analog filters do),  but operate on past=
, 
present, and future data to yield the present filtered  data point. What=
 I do 
to achieve this is to filter the data series forward in  time in the usual=
 
manner, and then apply the filter to that result again, but  backward in=
 
time. This results in output data that is undistorted in time and  phase.=
 To 
use a photographic analogy, it softens the noise in a grainy picture  by=
 
defocusing it rather than smearing it. Most often, I use a 2nd order  Butt=
erworth 
run forward and backward through the recorded time series to yield  a 
4-pole zero lag filter. Its response is 6 dB down at the corner frequency,=
  and 
falls at the rate of 24 dB per octave for frequencies outside the  passban=
d. 
It suppresses unwanted frequencies, without much  ringing.
    Very interesting.

WinQuake also features FFT filtering, which is also non-causal and yields=
 
zero  lag and no phase distortion. I have tested its spectral response, an=
d 
it  matches the classical Butterworth response. If you use FFT filtering,=
 I  
recommend no more than 2 or 4 poles.

I have also developed a  special digital filter for extending the useful=
 
bandwidth of an open loop  sensor to lower frequencies. It is essentially=
 a 
mathematically correct "bass  boost" amplifier that
corrects for the fall off of response of the sensor  to frequencies below=
 
the natural period, and can even correct for the gain  error caused by 
damping. To get the correct output, the sensor's  natural
period must be accurately known. The damping factor must also be  known,=
 
but it is not so critical. My vertical sensor has a period of 4.4  seconds=
.. I 
routinely apply this filter to its data, to emulate the
output  of a 32-second sensor. 
    This requires an additional maximum gain of x53, so  if your backgroun=
d 
levels are say 200 counts, you will likely be OK.

My  horizontal sensors are adjusted to 8 and 13 seconds, respectively, and=
 
I  routinely extend their period to 32 seconds. I get heliplots that close=
ly 
 resemble those displayed at the nearby LDEO Palisades web site, which use=
s 
the  expensive STS-2 force feedback sensor, but of course I show reduced=
 
amplitude  on very long period waves, and a lot more cultural noise. I use=
  
DC-coupled
amplifiers in order not to attenuate further the low amplitude  low 
frequency signal components. Along with the longer period performance  com=
es 
greater sensitivity to tilt from moving around my site and from wind. I =
 can't get 
away from that. What is very bad and troublesome at times is that  any 
spurious spikes in the data show up in the filtered output as large  trans=
ients, 
like someone tapped a long period pendulum.
    There is really no problem in making horizontal  sensors with periods=
 
of up to 30 seconds. I get about 2 mm cyclic tilt  drift in a linear outpu=
t 
range of +/-10mm.  If you use a position  sensor as opposed to magnet  +=
 coil 
induction, you can use the integrated  output to keep the mass centralised=
.. 
Adding a couple of photocells, a long  integration period amplifier and a=
 
small coil can also do this job.

I  have developed a utility program called "WQFilter.exe" which can be use=
d 
to  apply all my filters to WinQuake event files. Should you want to 
experiment,  you can get the latest version from page "WinQuake and SAC Ut=
ility 
Programs".  You should use the "LONG PERIOD Plus HPF" option. It applies=
 the 
period  extending filter, followed by a backward Butterworth high pass fil=
ter 
set to  the same period as the period extending filter. This results in 
better  rejection of low frequency noise, and very importantly, it elimina=
tes 
all  phase and time distortion from the filtered record. To preserve time=
 and 
phase  on the high frequency end of the spectrum, the low-pass filter 
should filter  in both time directions.
    I certainly appreciate the great value of what you  have achieved with=
 
digital filters.

Since it is very difficult to build open loop vertical sensors having more=
  
than a few seconds natural period, my period extending filter is 
practically a  must for amateur vertical sensors. I would encourage amateu=
rs to 
acquire or  build vertical sensors. They are much better than horizontal=
 sensors 
for  detecting P waves. They do not respond to ground tilt, so their signa=
ls 
are  ideal for digital period extension filtering.
    You have a free choice with 24 bit ADC systems.  With 16 bit systems,=
 
the long period response can be comparable to, or below the  digital step=
 
amplitude for small amplitude quakes. 1/f^2 analog  period extension is a=
 
viable alternative out to x10 with no restriction on  signal amplitude. 
 
    Unless you use either a hermetic container, or  pressure compensation,=
 
atmospheric noise should be the principal  source with a vertical sensor.=
 
Have you tried compensating this?

 
    Best Regards,
 
    Chris
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<DIV>In a message dated 15/06/2009, bobmcclure90@......... writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>MY 
  THOUGHTS ON SEISMIC DATA FILTERING.<BR><BR>&nbsp; On most seismic events=
, it 
  is necessary to filter the raw data in order to suppress cultural noise&=
nbsp; 
  to get a better view of the ground motions of the event. First off, the=
 sensor 
  itself filters the data,<BR>and the amplifier filters the sensor output.=
 The 
  digitization process can also filter (and distort) the data. We can neve=
r 
  truly sense ground motion, but we can hope to reproduce accurately enoug=
h the 
  data of interest.<BR><BR>&nbsp; Sensors of the force-feedback type are=
 best 
  for high fidelity detection of ground motion. Most amateurs are limited=
 to the 
  use of open loop pendulum types, such as the horizontal Lehman sensor an=
d 
  vertical sensors of the spring supported pendulum type. Open loop sensor=
s can 
  only accurately reproduce signals appreciably higher than the natural re=
sonant 
  frequency of the pendulum.</FONT></BLOCKQUOTE>
<DIV>Hi Bob,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Are you forgetting period extending amplifier=
s, 
which can extend the response period by x10, fairly easily? I have extende=
d the 
period of an AS1 from 1.5&nbsp;to 20 seconds quite OK this way. And it is=
 a very 
considerable improvement! The Roberts circuit can be used, provided that=
 you 
couple the two stages with a two pole high pass filter to remove the long=
 period 
1/f noise. See <A 
href=3D"http://jclahr.com/science/psn/roberts/index.html">http://jclahr.co=
m/science/psn/roberts/index.html</A></DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>A signal 
  at the resonant frequency of the pendulum is shifted 90 degrees leading=
 in 
  phase, and its amplitude is proportional to the Q of the system. Q is 
  inversely proportional to the damping factor, D. The relationship is Q=
 =3D 
  0.5/D. Critical damping occurs when D=3D1 or Q=3D0.5. Usual practice is=
 to adjust 
  damping to a value of about 0.6, just low enough to sense a little overs=
hoot 
  on the return of a displaced pendulum to equilibrium. If you use more da=
mping, 
  you have little idea of how much it is, and if you use less damping, you=
 may 
  get ringing on seismic signals. At frequencies below resonance, the resp=
onse 
  falls off rapidly at a rate of 12 decibels per octave, and the phase shi=
ft 
  heads toward 180 degrees leading.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;With say a 3 cycle P wave, you are driving th=
e 
previously stationary inertial mass with a force a bit below that required=
 to 
produce critical damping eg 0.7, so any overshoot should be quite low.</DI=
V>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>&nbsp; 
  One can infer from the above that one should strive for a pendulum perio=
d 
  longer than the longest period one wishes to reproduce. However, the 
  difficulty of achieving this goal goes up as the square<BR>of the period=
.. 
  Horizontal sensors cannot distinguish the difference between horizontal=
 ground 
  acceleration and ground tilt, and the response to tilt goes up as the sq=
uare 
  of the period. Most amateurs do not have a site really stable in tilt.=
 
</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;WWSSN horizontal seismometers were designed=
 for 
periods of 30 seconds, but were usually run at periods of 15 seconds to en=
sure 
that they did not drift out of the linear sense range between annual servi=
cing. 
I find it quite satisfactory to run my Lehman at 20 seconds. They still pi=
ck up 
the occasional 40 second wave.</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>The same 
  can be said for temperature stability. Temperature fluctuations can caus=
e the 
  sensor to change its alignment, producing the same problems as ground ti=
lt 
  changes.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;This depends on how&nbsp;well you design your=
 
sensor. I have not found any significant&nbsp;thermal drift variations on=
 my 
Lehman.&nbsp;</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>&nbsp; 
  All this said, we amateurs just have to do the best we can with what we=
 have, 
  but my signal processing utilities can make a lot of improvement in the=
 
  recorded data.<BR><BR>&nbsp; After the sensor comes the amplifier, which=
 must 
  also attenuate high frequency signal components to avoid aliasing at the=
 
  subsequent sampling and digitization steps. Less low pass filtering is=
 needed 
  the higher the sampling rate. It is best to sample at a high rate, and=
 then 
  sample average n data points taken at the high rate to get a final sampl=
e rate 
  1/n times the input sample rate. My Dataq acquisition system does that=
 
  automatically for me. Its A/D samples at 240 samples per second overall.=
 If I 
  record three channels, each is being sampled at a rate of 80 samples per=
 
  second. I usually set my recorded rate at 5 samples per second per chann=
el, so 
  the Dataq recorder averages 16 data samples for each data point recorded=
.. This 
  process largely avoids any aliasing, effectively suppresses high frequen=
cy 
  noise, and gives me 14 bit resolution out my 12-bit A/D.</FONT></BLOCKQU=
OTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I don't quite follow this. With a high sample=
 rate 
you will still have higher frequency components which you don't want in yo=
ur 
final data. This also rather depends on how the noise level&nbsp;in your=
 ADC 
responds to sampling rate changes. The 20 micro second ADCs typically had=
 3 bits 
of noise. 16 data samples would remove two bits of ADC noise. Some of the=
 
sigma-delta types have only&nbsp;+/-1/2 LSB noise at the slower speeds.</D=
IV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>&nbsp; 
  Once we have logged data, we still must usually digitally filter it to=
 
  suppress unwanted frequency components, both low frequencies and high 
  frequencies. However, filtering done inappropriately can really mess up=
 the 
  waveform of the signal we want to preserve. WinQuake is a marvellous pro=
gram, 
  grateful thanks to Larry Cochrane, and we would be in the Dark Ages with=
out 
  it. However, it offers so many choices on filtering that the na=EFve use=
r has 
  ample opportunity to do bad things.<BR>&nbsp;&nbsp;&nbsp;&nbsp;I do not=
 
  believe in ever using more than 4 poles in the filters, for example. The=
 more 
  poles you use, the sharper the cut-off, the more the signal is time dela=
yed 
  and distorted, and more ringing may occur.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;This&nbsp;mostly happens if you use Butterwor=
th or 
elliptic filters. Bessel filters seem to be OK, but I agree that you rarel=
y need 
more than 4th order filters. If you have been using a 10 Hz Butterworth fi=
lter, 
you can get roughly the same HF roll off by designing a Bessel filter&nbsp=
;for 7 
Hz. It doesn't ring and there are no spiky signal delays at the band 
edge!&nbsp;</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 
  size=3D2>&nbsp;&nbsp;&nbsp;&nbsp; I also prefer not to use WinQuake's ca=
usal 
  Butterworth filter, which is the only IIR choice offered. I prefer to us=
e only 
  the filters implemented in my "WQFilter.exe" application. My filters are=
 not 
  causal (i.e., operating only on present and past data, as analog filters=
 do), 
  but operate on past, present, and future data to yield the present filte=
red 
  data point. What I do to achieve this is to filter the data series forwa=
rd in 
  time in the usual manner, and then apply the filter to that result again=
, but 
  backward in time. This results in output data that is undistorted in tim=
e and 
  phase. To use a photographic analogy, it softens the noise in a grainy=
 picture 
  by defocusing it rather than smearing it. Most often, I use a 2nd order=
 
  Butterworth run forward and backward through the recorded time series to=
 yield 
  a 4-pole zero lag filter. Its response is 6 dB down at the corner freque=
ncy, 
  and falls at the rate of 24 dB per octave for frequencies outside the 
  passband. It suppresses unwanted frequencies, without much 
ringing.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Very interesting.</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>&nbsp; 
  WinQuake also features FFT filtering, which is also non-causal and yield=
s zero 
  lag and no phase distortion. I have tested its spectral response, and it=
 
  matches the classical Butterworth response. If you use FFT filtering, I=
 
  recommend no more than 2 or 4 poles.<BR><BR>&nbsp; I have also developed=
 a 
  special digital filter for extending the useful bandwidth of an open loo=
p 
  sensor to lower frequencies. It is essentially a mathematically correct=
 "bass 
  boost" amplifier that<BR>corrects for the fall off of response of the se=
nsor 
  to frequencies below the natural period, and can even correct for the ga=
in 
  error caused by damping. To get the correct output, the sensor's 
  natural<BR>period must be accurately known. The damping factor must also=
 be 
  known, but it is not so critical. My vertical sensor has a period of 4.4=
 
  seconds. I routinely apply this filter to its data, to emulate the<BR>ou=
tput 
  of a 32-second sensor. </FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;This requires an additional maximum gain of=
 x53, so 
if your background levels are say 200 counts, you will likely be OK.</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>My 
  horizontal sensors are adjusted to 8 and 13 seconds, respectively, and=
 I 
  routinely extend their period to 32 seconds. I get heliplots that closel=
y 
  resemble those displayed at the nearby LDEO Palisades web site, which us=
es the 
  expensive STS-2 force feedback sensor, but of course I show reduced ampl=
itude 
  on very long period waves, and a lot more cultural noise. I use 
  DC-coupled<BR>amplifiers in order not to attenuate further the low ampli=
tude 
  low frequency signal components. Along with the longer period performanc=
e 
  comes greater sensitivity to tilt from moving around my site and from wi=
nd. I 
  can't get away from that. What is very bad and troublesome at times is=
 that 
  any spurious spikes in the data show up in the filtered output as large=
 
  transients, like someone tapped a long period pendulum.</FONT></BLOCKQUO=
TE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;There is really no problem in making horizont=
al 
sensors with periods of&nbsp;up to 30 seconds. I get about 2 mm cyclic til=
t 
drift in a linear output range of +/-10mm.&nbsp;&nbsp;If you use a positio=
n 
sensor as opposed to magnet&nbsp; + coil induction, you can use the integr=
ated 
output to keep the mass centralised. Adding a couple of photocells, a long=
 
integration period amplifier and a small coil&nbsp;can also do this job.</=
DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>&nbsp; I 
  have developed a utility program called "WQFilter.exe" which can be used=
 to 
  apply all my filters to WinQuake event files. Should you want to experim=
ent, 
  you can get the latest version from page "WinQuake and SAC Utility Progr=
ams". 
  You should use the "LONG PERIOD Plus HPF" option. It applies the period=
 
  extending filter, followed by a backward Butterworth high pass filter se=
t to 
  the same period as the period extending filter. This results in better=
 
  rejection of low frequency noise, and very importantly, it eliminates al=
l 
  phase and time distortion from the filtered record. To preserve time and=
 phase 
  on the high frequency end of the spectrum, the low-pass filter should fi=
lter 
  in both time directions.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;I certainly appreciate the great value of wha=
t you 
have achieved with digital filters.</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>&nbsp; 
  Since it is very difficult to build open loop vertical sensors having mo=
re 
  than a few seconds natural period, my period extending filter is practic=
ally a 
  must for amateur vertical sensors. I would encourage amateurs to acquire=
 or 
  build vertical sensors. They are much better than horizontal sensors for=
 
  detecting P waves. They do not respond to ground tilt, so their signals=
 are 
  ideal for digital period extension filtering.</FONT></BLOCKQUOTE>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;You have a free choice with 24 bit ADC system=
s. 
With 16 bit systems, the long period response can be comparable to, or bel=
ow the 
digital step amplitude for small amplitude quakes.&nbsp;1/f^2 analog 
period&nbsp;extension is a viable alternative out to x10 with no restricti=
on on 
signal amplitude. </DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Unless you use either a hermetic container,&n=
bsp;or 
pressure compensation,&nbsp;atmospheric&nbsp;noise&nbsp;should be the prin=
cipal 
source with a vertical sensor.&nbsp;Have you tried compensating this?</DIV=
>
<DIV></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Best Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris</DIV></FONT></BODY></HTML>

Subject: waterfall plot of infrasound data files?
From: "David Saum"  DSaum@............ 
Date: Thu, 18 Jun 2009 15:37:31 -0400

I am using Amaseis to record infrasound data
(sound below 20 Hz) and I would like to plot
my data to display dopper shifts.

My infrasound receiver is a few miles from
the Pentagon and I seem to be in the flight
path between the Pentagon and Quantico.
Every day I pick up helicopter noise in the
10 to 20 Hz band.  There seems to be
a nice dopper shift that I have not figured
out how to display with seismic software.

Here is a typical SAC data file from a
helicopter overflight this morning:
http://www.infiltec.com/seismo/090618heli1.sac 
The fundamental shifts from ~12.5 Hz as it 
approaches, to ~9.5 Hz as it leaves.

Can anyone suggest software to plot this data
to display the dopper shift?  Perhaps a stacked
3D spectra-time plot, or a 2D waterfall of 
frequency vs time?  Of course I can generate
any of the Amaseis file formats or any of the
WinQuake formats as program inputs.

Thanks

Dave
http://www.infiltec.com/Infrasound@home

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: waterfall plot of infrasound data files?
From: ChrisAtUpw@.......
Date: Thu, 18 Jun 2009 16:10:56 EDT

 
In a message dated 18/06/2009, DSaum@............ writes:

I am  using Amaseis to record infrasound data (sound below 20 Hz) and I 
would like  to plot
my data to display dopper shifts.



Have you tried _http://www.spectrascope.com/_ 
(http://www.spectrascope.com/)  ? I  seem to remember also a free program from Germany.
 
    Regards,
 
    Chris Chapman
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; charset=3DUS-ASCII">
<META content=3D"MSHTML 6.00.6000.16850" name=3DGENERATOR></HEAD>
<BODY id=3Drole_body style=3D"FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY=
: Arial" 
bottomMargin=3D7 leftMargin=3D7 topMargin=3D7 rightMargin=3D7><FONT id=3Dr=
ole_document 
face=3DArial color=3D#000000 size=3D2>
<DIV>
<DIV>In a message dated 18/06/2009, DSaum@............ writes:</DIV>
<BLOCKQUOTE 
style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"=
><FONT 
  style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 siz=
e=3D2>I am 
  using Amaseis to record infrasound data (sound below 20 Hz) and I would=
 like 
  to plot<BR>my data to display dopper shifts.<BR></FONT></BLOCKQUOTE></DI=
V>
<DIV></DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Have you tried <A 
href=3D"http://www.spectrascope.com/">http://www.spectrascope.com/</A>&nbs=
p;? I 
seem to remember also a free program from Germany.</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Regards,</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;&nbsp;&nbsp;&nbsp;Chris Chapman</DIV></FONT></BODY></HTML>

Subject: Re: waterfall plot of infrasound data files?
From: "Geoffrey"  gmvoeth@........... 
Date: Thu, 18 Jun 2009 13:15:30 -0700

Hello Mr. Saum;

1. Sound is a subjective term.
   If it can not be heard by humans its not called sound.
   Vibrations if you will.
2. You are living in a sensitive area of the country.
   I would recommend from personal experience you
   ignore human artifacts and try to filter them out
   from natural data. If you somehow draw the attention of
   national security your life may wind down a very
   unpleasant path of life.
3. FFT is a great way to look at any periodic thing
   even earthquakes.
   The results depend upon frequency resolution,
   sample rates,filtering, a data base of associations.
4. be careful of alizing frequencies they are misleading.
   Higher harmonics amplify any wavering in frequency.
   be sure of your entire system before you try to
   analyze any human thing. Humans are great at fooling
   machines. 60 HZ may serve as a good reference point
   to calibrate your data.
5. take up programming in BASIC or C or Assembly
   make your own waterfall display to do anything
   you are capable of doing.
6. Don't expect anyone to help you but if they do be thankful
   in your own way.
   I have found people to be very nasty when you ask for
   knowledge of practically anything.
   To me it is like the counter intelligence people
   are dominating the internet.
   They are experts at wasting human life.
7. Look at Manwith Hill England on the internet.
   If you cross national lines here in the USA
   Such people will be watching or filtering your
   communications. Possibly DPS or FCC will be watching
   anyone crossing state boundaries.
8. Forget the study of human artifacts unless you are
   in possession of a PHD. They are the only people
   who seem able to challenge national security.
   The usa is supposedly in a state of war.
   Laws differ from peace to war.
   They are much, much more lax; during peacetime.

Regards;
Such Are The sayings of (Don Juan) geoff :-)



----- Original Message ----- 
From: "David Saum" <DSaum@............>
To: <psn-l@..............>
Sent: Thursday, June 18, 2009 12:37 PM
Subject: waterfall plot of infrasound data files?


>I am using Amaseis to record infrasound data
> (sound below 20 Hz) and I would like to plot
> my data to display dopper shifts.
> 
> My infrasound receiver is a few miles from
> the Pentagon and I seem to be in the flight
> path between the Pentagon and Quantico.
> Every day I pick up helicopter noise in the
> 10 to 20 Hz band.  There seems to be
> a nice dopper shift that I have not figured
> out how to display with seismic software.
> 
> Here is a typical SAC data file from a
> helicopter overflight this morning:
> http://www.infiltec.com/seismo/090618heli1.sac 
> The fundamental shifts from ~12.5 Hz as it 
> approaches, to ~9.5 Hz as it leaves.
> 
> Can anyone suggest software to plot this data
> to display the dopper shift?  Perhaps a stacked
> 3D spectra-time plot, or a 2D waterfall of 
> frequency vs time?  Of course I can generate
> any of the Amaseis file formats or any of the
> WinQuake formats as program inputs.
> 
> Thanks
> 
> Dave
> http://www.infiltec.com/Infrasound@home
> 
> __________________________________________________________
> 
> Public Seismic Network Mailing List (PSN-L)
> 
> To leave this list email PSN-L-REQUEST@.............. with 
> the body of the message (first line only): unsubscribe
> See http://www.seismicnet.com/maillist.html for more information.
>
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: waterfall plot of infrasound data files?
From: rg  richg_1998@......... 
Date: Thu, 18 Jun 2009 13:37:03 -0700 (PDT)


Infrasound information from a Google search.

http://www.google.com/search?pz=1&ned=us&hl=en&q=infrasound&btnmeta%3Dsearch%3Dsearch=Search+the+Web

Rich

http://www.scroogle.org/

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: waterfall plot of infrasound data files?
From: Pete Rowe  ptrowe@......... 
Date: Thu, 18 Jun 2009 13:51:01 -0700 (PDT)

Hi David
A friend of mine, Grant Connell, has written a number of useful programs th=
at he gives away. One of which is Spectrumview.
Check out his website at http://www.hotamateurprograms.com/

I've used this program in the waterfall mode and find it easy to use.
Pete

--- On Thu, 6/18/09, David Saum <DSaum@............> wrote:

From: David Saum <DSaum@............>
Subject: waterfall plot of infrasound data files?
To: psn-l@..............
Date: Thursday, June 18, 2009, 12:37 PM

I am using Amaseis to record infrasound data
(sound below 20 Hz) and I would like to plot
my data to display dopper shifts.

My infrasound receiver is a few miles from
the Pentagon and I seem to be in the flight
path between the Pentagon and Quantico.
Every day I pick up helicopter noise in the
10 to 20 Hz band.=A0 There seems to be
a nice dopper shift that I have not figured
out how to display with seismic software.

Here is a typical SAC data file from a
helicopter overflight this morning:
http://www.infiltec.com/seismo/090618heli1.sac The fundamental shifts from =
~12.5 Hz as it approaches, to ~9.5 Hz as it leaves.

Can anyone suggest software to plot this data
to display the dopper shift?=A0 Perhaps a stacked
3D spectra-time plot, or a 2D waterfall of frequency vs time?=A0 Of course =
I can generate
any of the Amaseis file formats or any of the
WinQuake formats as program inputs.

Thanks

Dave
http://www.infiltec.com/Infrasound@home

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)

=0A=0A=0A      
<table cellspacing=3D"0" cellpadding=3D"0" border=3D"0" ><tr><td valign=3D"=
top" style=3D"font: inherit;">Hi David<br>A friend of mine, Grant Connell, =
has written a number of useful programs that he gives away. One of which is=
 Spectrumview.<br>Check out his website at http://www.hotamateurprograms.co=
m/<br><br>I've used this program in the waterfall mode and find it easy to =
use.<br>Pete<br><br>--- On <b>Thu, 6/18/09, David Saum <i>&lt;DSaum@infilte=
c.com&gt;</i></b> wrote:<br><blockquote style=3D"border-left: 2px solid rgb=
(16, 16, 255); margin-left: 5px; padding-left: 5px;"><br>From: David Saum &=
lt;DSaum@............&gt;<br>Subject: waterfall plot of infrasound data fil=
es?<br>To: psn-l@..............<br>Date: Thursday, June 18, 2009, 12:37 PM<=
br><br><div class=3D"plainMail">I am using Amaseis to record infrasound dat=
a<br>(sound below 20 Hz) and I would like to plot<br>my data to display dop=
per shifts.<br><br>My infrasound receiver is a few miles from<br>the Pentag=
on and
 I seem to be in the flight<br>path between the Pentagon and Quantico.<br>E=
very day I pick up helicopter noise in the<br>10 to 20 Hz band.&nbsp; There=
 seems to be<br>a nice dopper shift that I have not figured<br>out how to d=
isplay with seismic software.<br><br>Here is a typical SAC data file from a=
<br>helicopter overflight this morning:<br><a href=3D"http://www.infiltec.c=
om/seismo/090618heli1.sac" target=3D"_blank">http://www.infiltec.com/seismo=
/090618heli1.sac</a> The fundamental shifts from ~12.5 Hz as it approaches,=
 to ~9.5 Hz as it leaves.<br><br>Can anyone suggest software to plot this d=
ata<br>to display the dopper shift?&nbsp; Perhaps a stacked<br>3D spectra-t=
ime plot, or a 2D waterfall of frequency vs time?&nbsp; Of course I can gen=
erate<br>any of the Amaseis file formats or any of the<br>WinQuake formats =
as program inputs.<br><br>Thanks<br><br>Dave<br><a href=3D"http://www.infil=
tec.com/Infrasound@home"
 target=3D"_blank">http://www.infiltec.com/Infrasound@home</a><br><br>_____=
_____________________________________________________<br><br>Public Seismic=
 Network Mailing List (PSN-L)<br><br>To leave this list email <a ymailto=3D=
"mailto:PSN-L-REQUEST@.............." href=3D"/mc/compose?to=3DPSN-L-REQUES=
T@..............">PSN-L-REQUEST@..............</a> with the body of the mes=
sage (first line only): unsubscribe<br>See <a href=3D"http://www.seismicnet=
..com/maillist.html" target=3D"_blank">http://www.seismicnet.com/maillist.ht=
ml</a> for more information.<br></div></blockquote></td></tr></table><br>=
=0A=0A      

Subject: RE: waterfall plot of infrasound data files?
From: "Timothy Carpenter"  geodynamics@....... 
Date: Thu, 18 Jun 2009 17:06:03 -0400

David,
I've used a program called Goldwave for several years. It gives you (among
many other functions) an audio playback of your signal along with a
concurrent color spectrogram of the recording. It allows selective filtering
and variable playback speeds. For trial or purchase, go to
http://www.goldwave.com/
You may have to spend some time getting your sound files into a format
compatible with Goldwave but it does support numerous formats.
Regards,
-Tim-


Timothy Carpenter, P.E., Pres.
GeoDynamics Consultants, Inc.
5043 Whitlow Court
Commerce Township, Michigan 48382
248-363-4529 (Voice & Fax)
248-766-1629 (Cell)
geodynamics@........... (primary)
geodynamics@....... (secondary)
-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of David Saum
Sent: Thursday, June 18, 2009 3:38 PM
To: psn-l@..............
Subject: waterfall plot of infrasound data files?

I am using Amaseis to record infrasound data
(sound below 20 Hz) and I would like to plot
my data to display dopper shifts.

My infrasound receiver is a few miles from
the Pentagon and I seem to be in the flight
path between the Pentagon and Quantico.
Every day I pick up helicopter noise in the
10 to 20 Hz band.  There seems to be
a nice dopper shift that I have not figured
out how to display with seismic software.

Here is a typical SAC data file from a
helicopter overflight this morning:
http://www.infiltec.com/seismo/090618heli1.sac 
The fundamental shifts from ~12.5 Hz as it 
approaches, to ~9.5 Hz as it leaves.

Can anyone suggest software to plot this data
to display the dopper shift?  Perhaps a stacked
3D spectra-time plot, or a 2D waterfall of 
frequency vs time?  Of course I can generate
any of the Amaseis file formats or any of the
WinQuake formats as program inputs.

Thanks

Dave
http://www.infiltec.com/Infrasound@home

__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Re: waterfall plot of infrasound data files?
From: Robert McClure  bobmcclure90@......... 
Date: Thu, 18 Jun 2009 22:52:26 -0400

On Thu, Jun 18, 2009 at 3:37 PM, David Saum wrote:
Can anyone suggest software to plot this data
to display the dopper shift?  Perhaps a stacked
3D spectra-time plot, or a 2D waterfall of frequency vs time?  Of
course I can generate
any of the Amaseis file formats or any of the
WinQuake formats as program inputs.


Hi Dave,

  For waterall displays of WAV files, I use the free Raven Lite program:

  http://www.birds.cornell.edu/brp/raven/RavenOverview.html

  I have my own programs for converting SAC and WinQuake files to WAV
format. See

  http://bobmcclure90.googlepages.com/winsac

  I will try to see if I can do anything with your file, but it is so
short the waterfall will not show much. Faster sampling would help.
Waterfall displays are helpful for analyzing music and bird songs, but
for not much good for earthquakes, for example.

---Bob
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)


Subject: Satellites Guide Relief to Earthquake Victims
From: "Dale Hardy"  photon1@........... 
Date: Fri, 19 Jun 2009 21:49:46 +1000

For your information


NASA Science News for June 19, 2009
In the aftermath of a recent, deadly earthquake, the NASA-led SERVIR =
program orchestrated use of satellite data to show Central American =
disaster officials where help was needed most.

FULL STORY at

http://science.nasa.gov/headlines/y2009/18jun_servir.htm?list920627
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META content=3D"text/html; charset=3Diso-8859-1" =
http-equiv=3DContent-Type>
<META name=3DGENERATOR content=3D"MSHTML 8.00.6001.18783">
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT size=3D2>For your information</FONT></DIV>
<DIV><BR>&nbsp;</DIV>NASA Science News for June 19, 2009
<P>In the aftermath of a recent, deadly earthquake, the NASA-led SERVIR =
program=20
orchestrated use of satellite data to show Central American disaster =
officials=20
where help was needed most.
<P>FULL STORY at
<P><A=20
href=3D"http://science.nasa.gov/headlines/y2009/18jun_servir.htm?list9206=
27">http://science.nasa.gov/headlines/y2009/18jun_servir.htm?list920627</=
A></P></BODY></HTML>

Subject: Re: waterfall plot of infrasound data files (Helicopter.zip)
From: Robert McClure  bobmcclure90@......... 
Date: Fri, 19 Jun 2009 13:15:57 -0400

Hi Dave,

  I had more success than I expected in making a waterfall display of
your file. I have prepared a ZIP file containing the WAV format
version, and the resulting waterfall display of the spectrum. The WAV
file sampling rate is 4.0 Khz, representing a speed-up of 78.48616
times, so the frequency scale of the waterfall plot should be divided
by this number to get the actual frequency. The time scale is
compressed by the same factor.

  http://bobmcclure90.googlepages.com/Helicopter.zip

---Bob


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Subject: Re: waterfall plot of infrasound data files?
From: Robert McClure bobmcclure90@.........
Date: Thu, 18 Jun 2009 22:52:26 -0400

On Thu, Jun 18, 2009 at 3:37 PM, David Saum wrote:
Can anyone suggest software to plot this data to display the dopper
shift?  Perhaps a stacked 3D spectra-time plot, or a 2D waterfall of
frequency vs time?  Of
course I can generate any of the Amaseis file formats or any of the
WinQuake formats as program inputs.


Hi Dave,

  For waterfall displays of WAV files, I use the free Raven Lite program:

  http://www.birds.cornell.edu/brp/raven/RavenOverview.html

  I have my own programs for converting SAC and WinQuake files to WAV
format. See

  http://bobmcclure90.googlepages.com/winsac

  I will try to see if I can do anything with your file, but it is so
short the waterfall will not show much. Faster sampling would help.
Waterfall displays are helpful for analyzing music and bird songs, but
for not much good for earthquakes, for example.

---Bob
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Subj:    Re: waterfall plot of infrasound data files
Date:    06/18/2009
To:    dsaum@............

Hi Dave,

  I will tell you how to see a "movie" of the Doppler shift in your file:

1. Load your SAC file into WinQuake.
2. Set the X-Scale to 6 seconds.
3. Select "FFT, View Only" in the "Calculate" menu.
4. In the "Window" menu, select "Arrange".
5. Click on and hold down the right arrow of the horizontal scroll bar
at the bottom of the window. You will see a succession of FFT's as the
data scrolls by. You will see a spectral peak that shifts.

Cheers,

Bob
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Public Seismic Network Mailing List (PSN-L)


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