HR: 0800h
AN: IN21B-0477 [Abstracts]
TI: ShakeOut and its Effects in Los Angeles and Oxnard Areas
AU: * Taborda, R
EM: rtaborda@andrew.cmu.edu
AF: Civil and Environmental Engineering, Carnegie Mellon University, 5000 Forbes Avenue,
Pittsburgh, PA 15213, United States
AU: Ramírez-Guzmán, L
EM: lramirez@andrew.cmu.edu
AF: Civil and Environmental Engineering, Carnegie Mellon University, 5000 Forbes Avenue,
Pittsburgh, PA 15213, United States
AU: López, J
EM: jclopez@andrew.cmu.edu
AF: Electrical and Computer Engineering Department, Carnegie Mellon University, 5000
Forbes Avenue, Pittsburgh, PA 15213, United States
AU: Urbanic, J
EM: urbanic@psc.edu
AF: Pittsburgh Supercomputing Center, 300 S. Craig St., Pittsburgh, PA 15213, United States
AU: Bielak, J
EM: jbielak@andrew.cmu.edu
AF: Civil and Environmental Engineering, Carnegie Mellon University, 5000 Forbes Avenue,
Pittsburgh, PA 15213, United States
AU: O'Hallaron, D
EM: droh@andrew.cmu.edu
AF: Electrical and Computer Engineering Department, Carnegie Mellon University, 5000
Forbes Avenue, Pittsburgh, PA 15213, United States
AU: O'Hallaron, D
EM: droh@andrew.cmu.edu
AF: Computer Science Department, Carnegie Mellon University, 5000 Forbes Avenue,
Pittsburgh, PA 15213, United States
AB:
Three-dimensional simulations of earthquakes have given a deeper understanding of wave propagation and site
effects in urban regions. In this work we study the impact of a potential major earthquake on the San Andreas
Fault with significant seismic hazard in the Greater Los Angeles Basin. We present results for the ShakeOut
simulation---a rupture beginning near Salton Sea, California, heading 270 km northwest along the fault, that
produces a Mw 7.8 earthquake in a geographical region which includes all major populated areas of Southern
California and northern Mexico, in a 600 km by 300 km by 80 km volume, for a maximum frequency of 1.0 Hz and a
minimum shear wave velocity of 200 m/s. For the material model, we use a discretized version of SCEC's CVM4
velocity model, called CVM-Etree. The simulation was performed at the Pittsburgh Supercomputing Center using
Hercules, a finite element octree-based, parallel software developed by the Quake Group at Carnegie Mellon
University. Hercules implements a highly efficient end-to-end algorithm for solving the wave field in highly
heterogeneous media due to kinematic faulting. We verify our results by comparing synthetic seismograms
computed with a parallel finite difference code by Robert Graves (URS) for a similar scenario earthquake, for a
maximum frequency of 0.5 Hz and minimum shear wave velocity of 500 m/s. We focus our analysis of the results
of the 1.0 Hz ShakeOut simulation on the Los Angeles Basin area, and the Santa Clara River Valley and Oxnard
Plain. We examine the site effects present in these two areas and their proneness to capture and amplify seismic
waves due to their geological features. Results show a direct correlation between the amplification levels and the
local soil and basin profiles.
UR: http://www.cs.cmu.edu/~{}quake
DE: 1706 Computational geophysics
DE: 7212 Earthquake ground motions and engineering seismology
DE: 7290 Computational seismology
SC: Earth and Space Science Informatics [IN]
MN: 2007 Fall Meeting