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Seismic Waves
Seismic waves
Number 723
Date Apr. 5th 2010
Previous Computer Problems
Next Hell

Seismic Waves is the 723rd xkcd comic.

ExplanationEdit

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"The USGS operates a really neat email/SMS earthquake notification service (earthquake.usgs.gov/ens/) that allows fine-grained control of notifications."

See alsoEdit

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