PSN-L Email List Message
Subject: Re: Surface waves from Sumatra M 9.0, 2nd Version
From: John Hernlund hernlund@............
Date: Thu, 6 Jan 2005 13:48:16 -0800
Thanks for pointing this out.
Hint for answer: Earth is spherical, not circular...
On Thursday, January 6, 2005, at 11:10 AM, John or Jan Lahr wrote:
> If you haven't taken a look at the IRIS "Image of the Week" yet,
> check out this page (with the now correct URL!):
> 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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