Surface waves from Sumatra M 9.0

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From: John or Jan Lahr (JohnJan@lahr.org)
Date: Thu Jan 06 2005 - 06:41:27 PST 

Message-Id: <6.2.0.14.2.20050106072838.025eec48@mail.comcast.net>
Date: Thu, 06 Jan 2005 07:41:27 -0700
From: John or Jan Lahr <JohnJan@lahr.org>
Subject: Surface waves from Sumatra M 9.0

If you haven't taken a look at the IRIS "Image of the Week" yet,
check out this page:
file:///C:/education/Sumatra%209.0/surface_waves.htm

The image shows seismic records from stations distributed around
the globe and surface waves that traveled twice around!

Questions to think about -- Why does the y-axis stop at 180 degrees?
Why would the amplitude of the surface waves fall off around 90 degrees
and then increase at 180 degrees again?

Cheers,
John

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