PSN-L Email List Message

Subject: Re: exact frequencies for arrival of different seismic waves ??
From: "Geoff" gmvoeth@...........
Date: Thu, 26 Jan 2006 23:34:45 -0700


Thanks Dave;

I just got three EQs from Baja California looks like
two foreshocks and the main, they are a little over three
degrees away and 4,0 or less in magnitude.
It looks to me like the P waves are in the hertz range
which is beyond the rolloff of my current filter.
The other day I received Teleseismic event from New Zealand
that was said to be 90deg away and only 5.2 mag which
was inband..it looked like the freq was down around
5 hertz or so.

You pointd out something I never saw before with the link
you provided, thank you very much. I never understood
what those spheres represented till now.

I am currently using a two octave filter which provides
flatness below 1 Hz and am able to see both regional
and teleseismic P waves.

My filter is down to three opamps now where it used to
be 8 or so :-) and I get better results.
I got this penpal over in England that believes
in a KISS philosophy (Keep it Simple Stupid)
that philosophy has proven to be true.

Once Again Thanks to PSN and people like
yourself I am an old dog learning new tricks.

gmv

----- Original Message ----- 
From: "Dave Nelson" 
To: 
Sent: Thursday, January 26, 2006 9:30 PM
Subject: Re: exact frequencies for arrival of different seismic waves ??

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