Quantifying Uncertainties in Earthquake Scenario Ground Motion Calculations: Finite Source Effects

H. J. Wang (), H. Igel (), A. Cochard () and M. Ewald ()
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H. J. Wang: Ludwig-Maximilians-University of Munich, Department of Earth and Environmental Sciences
H. Igel: Ludwig-Maximilians-University of Munich, Department of Earth and Environmental Sciences
A. Cochard: Institut de Physique du Globe
M. Ewald: Ludwig-Maximilians-University of Munich, Department of Earth and Environmental Sciences

A chapter in High Performance Computing in Science and Engineering, Garching/Munich 2007, 2009, pp 601-610 from Springer

Abstract: Abstract Finite-fault source inversions reveal the spatial complexity of earthquake slip over the fault plane. In this study, several possible earthquake scenarios of Mw7.0 are simulated with different quasi-dynamic finite source models for the Newport Inglewood (NI) fault system in the Los Angeles (LA) basin embedded in the 3-D SCEC community velocity model version 3. We make use of the recently developed Numerical Greens Functions method in (Wang, Strong Ground Motion Variations in Los Angeles Basin, 2007) and synthesize ground motions from a data base of 3-D Greens functions, calculated for a discretized model of the NI fault. This allows efficient simulation of arbitrary slip histories. We investigate the effects of the various slip histories on peak ground velocities and the related uncertainties in ground motion prediction for our study area. The results confirm that the fault perpendicular components of motion are dominated by directivity effects while the fault parallel component is influenced both by the slip distribution and the basin structure.

Date: 2009
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DOI: 10.1007/978-3-540-69182-2_46

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