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Earthquake Ground Motion Modeling on Parallel Computers Hesheng Bao, Jacobo Bielak, Omar Ghattas, David R. O'Hallaron, Loukas F. Kallivokas, Jonathan Richard Shewchuk, Jifeng Xu Department of Civil and Environmental Engineering / School of Computer Science Carnegie Mellon University Pittsburgh, Pennsylvania 15213 We describe the design and discuss the performance of a parallel elastic wave propagation simulator that is being used to model earthquake-induced ground motion in large sedimentary basins. The components of the system include mesh generators, a mesh partitioner, a parceler, and a parallel code generator, as well as parallel numerical methods for applying seismic forces, incorporating absorbing boundaries, and solving the discretized wave propagation problem. We discuss performance on the Cray T3D for unstructured mesh wave propagation problems of up to 77 million tetrahedra. By paying careful attention to each step of the process, we obtain excellent performance despite the highly irregular structure of the problem. The mesh generator, partitioner, parceler, and code generator collectively form an integrated toolset called Archimedes, which automates the solution of unstructured mesh PDE problems on parallel computers, and is being used for other unstructured mesh applications beyond ground motion modeling. Supercomputing '96 (Pittsburgh, Pennsylvania), November 1996. PostScript (color, 9,370k, 19 pages). BibTeX entry: @inproceedings{quake96, author = {Hesheng Bao and Jacobo Bielak and Omar Ghattas and David R. O'Hallaron and Loukas F. Kallivokas and Jonathan Richard Shewchuk and Jifeng Xu}, title = {Earthquake {G}round {M}otion {M}odeling on {P}arallel {C}omputers}, booktitle = {Supercomputing '96}, address = {Pittsburgh, Pennsylvania}, month = nov, year = 1996 }