The Community for Technology Leaders
SC Conference (2003)
Phoenix, Arizona
Nov. 15, 2003 to Nov. 21, 2003
ISBN: 1-58113-695-1
pp: 52
George Biros , New York University, NY
Julio López , Carnegie Mellon University, Pittsburgh, Pennsylvania
Antonio Fernández , Carnegie Mellon University, Pittsburgh, Pennsylvania
Jacobo Bielak , Carnegie Mellon University, Pittsburgh, Pennsylvania
Omar Ghattas , Carnegie Mellon University, Pittsburgh, Pennsylvania
John Urbanic , Pittsburgh Supercomputing Center, Pittsburgh, Pennsylvania
David O'Hallaron , Carnegie Mellon University, Pittsburgh, Pennsylvania
Eui Joong Kim , Carnegie Mellon University, Pittsburgh, Pennsylvania
Ioannis Epanomeritakis , Carnegie Mellon University, Pittsburgh, Pennsylvania
Tiankai Tu , Carnegie Mellon University, Pittsburgh, Pennsylvania
Vokan Akçelik , Carnegie Mellon University, Pittsburgh, Pennsylvania
ABSTRACT
For earthquake simulations to play an important role in the reduction of seismic risk, they must be capable of high resolution and high fidelity. We have developed algorithms and tools for earthquake simulation based on multiresolution hexahedral meshes. We have used this capability to carry out 1 Hz simulations of the 1994 Northridge earthquake in the LA Basin using 100 million grid points. Our wave propagation solver sustains 1.21 teraflop/s for 4 hours on 3000 AlphaServer processors at 80% parallel efficiency. Because of uncertainties in characterizing earthquake source and basin material properties, a critical remaining challenge is to invert for source and material parameter fields for complex 3D basins from records of past earthquakes. Towards this end, we present results for material and source inversion of high-resolution models of basins undergoing antiplane motion using parallel scalable inversion algorithms that overcome many of the difficulties particular to inverse heterogeneous wave propagation problems.
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CITATION
George Biros, Julio López, Antonio Fernández, Jacobo Bielak, Omar Ghattas, John Urbanic, David O'Hallaron, Eui Joong Kim, Ioannis Epanomeritakis, Tiankai Tu, Vokan Akçelik, "High Resolution Forward And Inverse Earthquake Modeling on Terascale Computers", SC Conference, vol. 00, no. , pp. 52, 2003, doi:10.1109/SC.2003.10056
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