From: "Larry Cochrane" <cochrane@..............> Subject: Re: WinSDR update Date: Sun, 28 Jul 2002 17:42:30 -0700
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
.