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The Center for Ocean - Atmospheric Prediction Studies (COAPS) has constructed a simulation of the devastating tsunami that struck the Indian Ocean on December 26, 2004. The tsunami is simulated using the Navy Coastal Ocean Model with a grid size of 1800x1120 and approximately 5km grid spacing. The simulation uses a semi-implicit time integration scheme with a 24 second time step, and requires less than 10 minutes on 20 processors of the FSU IBM SP4 Eclipse supercomputer.