PSN-L Email List Message

Subject: Re: Wave Id's
From: John or Jan Lahr JohnJan@........
Date: Thu, 11 Jan 2007 11:22:54 -0800


There is a free PC program that is great for understanding many of 
the phases on a seismogram.
I always find the web site via google:  alan jones seismic
Alan's site will be the first hit.

Download the program SeismicWaves from his site.  This program shows 
how the wave fronts
progress through the Earth, bouncing, converting, and refracting at 
the major layers.  At the same
time, actual seismograms are displayed as they would have looked when 
being recorded.  The
phases are labeled on the seismograms as they arrive.  The 
earthquakes are generally played
in speeded up time, as otherwise it would take 20 minutes to see the 
first waves reach all the
way through the Earth.

For a full list of phases and ray-path diagrams, check out this site:
Note that in some of the diagrams, where the paths for P and S are the same,
paths are labeled P/S, which means P or S.  Similarly, Pdiff and Sdiff paths
are shown with the same red line.


At 10:08 AM 1/11/2007, you wrote:
>Hi All,  It was pointed out that within Winquake software is a 
>pulldown menu which places the various wave id markers.  Is there a 
>page avail which explains what the id's initials stand for?  As an 
>example P= primary S= secondary  SSS,? LQ, LR and so on.
>Thanks, Ted


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