sixpenceee: The Earthquake Rose When a magnitude 6.8 earthquake shook Olympia, Wash., in 2001, shop
sixpenceee: The Earthquake Rose 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. Woah thats pretty cool -- source link