PSN-L Email List Message
Subject: RE: Microseisms and the need for PSN to look closer
From: "James Hannon" jmhannon@.........
Date: Fri, 25 Feb 105 09:55:25 CST
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
>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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