Virginia quake seismic waves march across the US
Seismometers from the EarthScope project Transportable Array measured the up-and-down motion of the ground from the magnitude 5.9 earthquake that occurred in Virginia on August 23, 2011. You can see the waves move across the country! Red is upward motion; blue down. The height of the wave was only 22 microns!
Original data: http://www.iris.edu/spud/gmv/109962
Credit: Data from the TA network were made freely available as part of the EarthScope USArray facility supported by the National Science Foundation, Major Research Facility program under Cooperative Agreement EAR-0350030.