John,

Thanks for pointing this out.

Hint for answer: Earth is spherical, not circular...

Cheers!
John

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!):
> http://www.iris.edu/about/ENO/iow.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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