PSN-L Email List Message

Subject: Re: False Earthquake Signatures
From: Larry Cochrane lcochrane@..............
Date: Wed, 06 Aug 2008 14:32:31 -0700


Gary, this looks like a freight train going by. If you do an FFT on the data you will 
see that the frequency range is rather narrow. An earthquake generates waves in a 
broader spectrum.

Regards,
Larry Cochrane
Redwood City, PSN

Gary Lindgren wrote:
> Sometimes I try locate an earthquake that I see on my sensor and can't find
> anything on the networks. From the way it looks, I would say it was an
> earthquake. What is happening. Would these be extremely small tremors close
> by that are not registered by the networks. See this one I detected today.
> http://gelindgren.googlepages.com/080806.073329.ch1.psn.gif 
> 
> Gary
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> Gary Lindgren
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> 585 Lincoln Ave
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> Palo Alto CA 94301
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> 650-326-0655
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>   www.blue-eagle-technologies.com
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>   cymonsplace.blogspot.com 
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