Watch how the ground really moves during an earthquake

This Movie is showing ground motion of four earthquakes propagating across a high density seismic array in Long Beach, California. Data was recorded by NodalSeismic, LLC during the acquisition of a 3D reflection survey. Movie was produced by Dr. Rob Clayton of Caltech and Magali Barba of UC Berkeley. Data provided by Signal Hill Petroleum, Inc.
compiled in 2011by geologist working for Signal Hill Petroleum surveying an oilfield underneath Long Beach CA