The International Conference for High Performance Computing, Networking, Storage and Analysis
Simulated Wave Propagation for the Mw5.4 Chino Hills, CA, Earthquake.
Authors: Kim B. Olsen (San Diego State University), William Savran (San Diego State University), Yifeng Cui (San Diego Supercomputer Center), Efecan Poyraz (San Diego Supercomputer Center), Philip Maechling (University of Southern California), Thomas H. Jordan (University of Southern California), Tim Scheitlin (National Center for Atmospheric Research), Perry Domingo (National Center for Atmospheric Research)
Abstract: As ever-increasing computational resources allow earthquake scientists to push the frequency limits of deterministic ground motion estimates higher, understanding small-scale, near-surface heterogeneities becomes paramount. SCEC researchers are working to improve ground motion simulations for California by developing more realistic small-scale models of the earth's near-surface structure.
This visualization compares two simulation results showing velocity magnitude at the earth's surface for the 29 July 2008, M5.4 Chino Hills, California earthquake. The earthquake was felt by many people throughout the Los Angeles basin and the surrounding areas, although there was very little damage.
For the two simulations shown, all differences can be attributed to the impact of the small-scale heterogeneities as well as anelastic attenuation. The animation on the right shows a Chino Hills simulation with unmodified SCEC Community Velocity Model (CVM-S v11.2). The animation on the left shows a Chino Hills simulation that uses a modified version of CVM-S v11.2 that contains more realistic small-scale complexities. The animations show that the more complex velocity structure used in the left simulation, clearly impacts the ground motion distribution, the levels of peak ground motion, and the duration of shaking.
The simulation on the left was run on the NCAR-CISL Yellowstone system. The run took 2 hours and 22 minutes and used 13125 cores with a mesh size of 3500x2500x1500.
The next scientific step is to compare both simulation results against observed data for this event to determine which velocity model most closely reproduces the observed ground motions for this earthquake.