PSN-L Email List Message

Subject: Re: Range of 4,5Hz geophone
From: ian ian@...........
Date: Sun, 08 Jan 2006 12:40:07 +0000

I'm getting an amazing trace on my Lehman of the Greek quake, still in 
progress.  Interestingly, there is a small event on my geophone which 
seems to co-incide with the P wave.  Is this likely?  See

I'm just about to fit a permanent set of heaters in the box.  The 
temporary desk lamp has been great since I put it in, cured the problem 
completely.  I'll have to wait a bit now so as to not disturb the trace 
in progress....

Ian Smith

Jón Frímann wrote:

>Hi all
>I do think i found the source of the problem, i think that the ampling
>of the psnamp board was too low. I did change it, but i am not sure how
>much i did change it, it has the jumper on and the gain is from 175 -
>1750. I did turn them clockwise and i think the settings now at maximum
>settings. I see bit more noise then i did before.
>If the range of a 4,5Hz geophone is up to 640 km max, then i problay
>will not have problems picking up most small quakes that happen near me,
>or at least up to 200km away from me.

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