Date: Mon, 29 Jul 2002 09:55:08 -0600 From: "Jonathan M. Hanson" <jhanson@..............> Subject: Re: WinSDR update
Hi Larry -
I will check with Utah Geophysical on this. I believe that Lew Katz has
used this method and may be able to provide some info...if we are lucky,
some code. Also, I got a response regarding the EV-17 sensor, complete
with frequency response curves!
Regards, Jon
Larry Cochrane wrote:
>Hi Jonathan,
>
>Thanks for the update. On the WinQuake wish list is the ability to plot the
>direction based on three components. The problem is I don't know how to do
>this so I need to do some research before I can add this feature.
>
>Regards,
>Larry Cochrane
>Redwood City, PSN
>
>----- Original Message -----
>From: "Jonathan M. Hanson" <jhanson@..............>
>To: <winsdr@..............>
>Sent: Sunday, July 28, 2002 8:07 AM
>Subject: WinSDR update
>
>
>>Hi Larry -
>>
>>Thanks for the WinSDR update. I have not contacted you since I got my
>>system going so here is a brief update.
>>
>>A friend of mine (Lew Katz, Pres. Utah Geophysical) has lent me several
>>geophones to play around with. The most intriguing is an Electro-Tech
>>EV-17H that he dug out of one of his storage units. I have not been
>>able to find any information on this unit but it seems to have a
>>somewhat lower frequency response than the Mark Products geophone I
>>purchased from you. I have attached a couple of jpegs showing recorded
>>quakes about 60 miles (Huntsville, UT) and a couple of hundred miles
>>(Yucca Mtn, NV) as recorded by this unit on June 2 of this year. The
>>picture labeled june14_02 shows both quakes..the first is the Huntsville
>>quake and the second is the Yucca Mtn quake. The picture labeled
>>june15_02C shows the Huntsville quake. I would appreciate any
>>information you might have on the EV-17H. I did a web search and the
>>only hit I got on Electro-Tech was one geophone on the SEG "virtual
>>museum" site. I suspect my unit was built in the 40's or 50's but this
>>is pure speculation. I have not yet had the time to build a long-period
>>sensor but hope to do so shortly.
>>
>>Do you have any short or long term plans of adding some sort of
>>polarization filter module to WinQuake? This might allow those users
>>that are recording 3 components to get an estimate not only of the
>>distance to the quake but also direction. There is a rather large amount
>>of mining activity in Utah and surrounding states. A directional filter
>>would help me sort out the mining-associated activity from other activity.
>>
>>Best regards,
>>
>>Jonathan Hanson
>>
>
>
>
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