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October 21, 2013
Watch the whole U.S. ripple
Want to see what happens to the ground in the United States when an earthquake snaps the crust elsewhere in the world? The waves ripple outward through the continent oscillating each county and city in turn. This video shows real data from seismometers deployed across the country. Each dot represents a seismometer. Each instrument’s motion is displayed here as alternating red (for upward motion) and blue (for downward motion). Individually …