25/07   7:00- 9:00 (Gr. t) M 6 - 6,5   Indonezia
Yagodin Alexandr
----- Original Message ----- 
From: "Doug Crice" 
To: 
Sent: Sunday, July 24, 2005 10:45 PM
Subject: RE: Geophones


> When I said Larry's were the best choice, I thought you were recording
> earthquakes, not doing exploration seismic.
>
> For earthquakes, you need lower natural frequencies and 3-component in a
> triax package.  For exploration, you need something higher, maybe 10 to 28
> Hz in what we call a "land case" with a spike.  New, they are about $30
for
> the basic element and $60 in a case with leads attached.
>
> Naturally, they are cheaper used, but you have to scratch around.  If they
> are oil exploration surplus, they come in multiple phones wired in series
> parallel (designed to filter out surface waves).  You can take them apart
> and use the individual phones. This is the cheapest source.
>
> You can find these "geophone strings" and single phones at
> http://www.rtclark.com/
>
> Doug Crice          http://www.geostuff.com
> Wireless Seismic            http://www.wirelessSeismic.com
> 12996 Somerset Drive                phone 1-530-274-4445
> Grass Valley,  CA  95945  USA    fax 1-530-274-4446
>
>
>
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