Watch how the ground really moves during an earthquake

Back in 2011, geologists working for Signal Hill Petroleum and NodalSeismic conducted an extremely detailed survey to measure the 3D rock structure beneath their Long Beach oilfield. To do so, they deployed a series of seismic arrays consisting of 5,300 nodes spaced about 330 feet (100 meters) apart. And then the‚Ķ » 12/19/12 7:40am 12/19/12 7:40am