More ideas from Patricia María
When a magnitude 6.8 earthquake shook Olympia, Wash., in 2001, shopowner 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.

Earthquake art: when a magnitude earthquake shook Olympia, Washington in shop owner Jason Ward discovered that a sand tracing pendulum had recorded the vibrations in this image.