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PRODID:-//Microsoft Corporation//Outlook MIMEDIR//EN
VERSION:1.0
BEGIN:VEVENT
DTSTART:20131119T010000Z
DTEND:20131119T040000Z
LOCATION:Mile High Pre-Function
DESCRIPTION;ENCODING=QUOTED-PRINTABLE: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.=0A=0AThis 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.=0A=0AFor 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. =0A=0AThe 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.=0A=0AThe 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.
SUMMARY:Simulated Wave Propagation for the Mw5.4 Chino Hills, CA, Earthquake
PRIORITY:3
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