PSN-L Email List Message

Subject: Surface waves from Sumatra M 9.0
From: John or Jan Lahr JohnJan@........
Date: Thu, 06 Jan 2005 07:41:27 -0700

If you haven't taken a look at the IRIS "Image of the Week" yet,
check out this page:

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?



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