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.

Mauro Mariotti

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.
>Jim Hannon
>---------- Original Message ----------------------------------
>From: John or Jan Lahr 
>Reply-To: psn-l@..............
>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 > >eruptions.

> >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?

> >Cheers,
> >John

> > >-- >Jim Hannon > >42,11.90N,91,39.26W >WB0TXL >-- > >__________________________________________________________ > >Public Seismic Network Mailing List (PSN-L) > >To leave this list email PSN-L-REQUEST@.............. with >the body of the message (first line only): unsubscribe >See for more information. __________________________________________________________ Public Seismic Network Mailing List (PSN-L)

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