PSN-L Email List Message

Subject: Re: distortion on geophones
From: "Larry Cochrane" lcochrane@..............
Date: Mon, 28 Jun 2004 00:02:50 -0700


This looks like an electrical problem rather then a problem with the sensor.
Is the signal from the sensor going through one of my Amp/Filter boards? If
it is you may want to send it back to me so I can check it out.

Larry Cochrane
Redwood City, PSN

----- Original Message ----- 
From: "tdick" 
Sent: Sunday, June 27, 2004 7:22 AM
Subject: distortion on geophones

Before I dig up my geophone which are about four feet down in my rose bed -- 
I am trying to figure out if this distortion of wave form is due to water in
the bottom of the hole or due to a changes in the amplifier. On local mine
blasts I am getting distortion while on earthquakes I am not. I have posted
some examples at this site

it will look like a drive on your computer, open folder called Distortion on


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