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Earthquake Art

 
PaleBlueDot
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User ID: 12506015
United States
12/07/2012 01:30 PM
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Earthquake Art
[link to savvy-living.com]

"When a magnitude 6.8 earthquake shook Olympia, Wash., in 2001, shop owner Jason Ward discovered that a sand-tracing pendulum had recorded the vibrations in the image above.

Seismologists say that the “flower” at the center reflects the higher-frequency waves that arrived first; the outer, larger-amplitude oscillations record the lower-frequency waves that arrived later."