PSN-L Email List Message
Subject: RE: Microseisms and the need for PSN to look closer
From: Mauro Mariotti mariotti@.........
Date: Tue, 01 Feb 2005 16:45:56 +0100
i used spectrograms many times.
I confirm that GRAM from Richard Horne is very well made
fast and reliable.
I applied a FFT for both graph and spectrograph JTF to seismowin
it can be used also for noise comparison with the Peterson's noise curve
widely recognized as a standard noise model.
People using DATAQ board could benefit of this seismowin's tool.
At 16:53 25/02/2005, you wrote:
>I have used this program before.
> It used to be free but you can still find older free versions on
> download sites.
>---------- Original Message ----------------------------------
>From: John or Jan Lahr
>Date: Fri, 25 Feb 2005 07:19:42 -0800
> >Hi Jack,
> >We used "spectrograms" of the sort that you described in
> >studying the 1989-1990 eruption of Mt. Redoubt, Alaska. They were
> >the best method that we found to monitor and distinguish "LP"
> >events (with emergent arrivals and lower frequency content) from
> >"VT" events (volcano-tectonic events with higher-frequency
> >content and sharp arrivals). Swarms of LP events tended to precede
> >It would be great to have a tool available to amateur seismologists and
> >educators that would allow spectrograms to be easily generated. Do
> >you think this could be done without the use of Matlab?
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