More information is available at: http://global.shakemovie.princeton.ed.... This video from Princeton Global ShakeMovie illustrates the upanddown velocity of the earthquake. Strong blue waves indicate rapid downward surface movement, while strong red waves indicate strong upward motion. Researchers at Princeton investigate and inform the public about earthquakes worldwide through Global ShakeMovie, an online portal that shows nearrealtime visualizations of recent earthquakes worldwide. These visualizations, which are usually live within seven hours of an event, are based on simulations carried out on a large computer cluster in order to provide information that enhances the public knowledge and understanding of earthquakes.