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Frame from a movie of a "virtual earthquake" simulation of the type that will be run on SDSC's new OnDemand system to support event-driven science. The movie shows the up-and-down velocity of the Earth's surface as waves radiate out from a magnitude 4.3 earthquake centered near Beverly Hills, California. Strong blue waves indicate the surface is moving rapidly downward, while red/orange waves indicate rapid upward motion. Courtesy of Joroen Tromp, ShakeMovie, Caltech.