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Earthquake Spectra / Volume 27 / Issue 2 / MANUSCRIPTS

Earthquake Spectra 27, pp. 331-350 (2011); doi:http://dx.doi.org/10.1193/1.3583644

Comparison of Ground Motions from Hybrid Simulations to NGA Prediction Equations

Lisa M. Star, S.M.EERI1, Jonathan P. Stewart, M.EERI1, and Robert W. Graves, M.EERI2

1University of California Los Angeles, Civil and Environ. Engrg. Dept., 5731 Boelter Hall, Los Angeles, CA 90095-1593. lcoyne@ucla.edu; jstewart@seas.ucla.edu
2U.S. Geological survey, 525 South Wilson Avenue, Pasadena, CA 91106, rwgraves@usgs.gov

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We compare simulated motions for a Mw 7.8 rupture scenario on the San Andreas Fault known as the ShakeOut event, two permutations with different hypocenter locations, and a Mw 7.15 Puente Hills blind thrust scenario, to median and dispersion predictions from empirical NGA ground motion prediction equations. We find the simulated motions attenuate faster with distance than is predicted by the NGA models for periods less than about 5.0 s After removing this distance attenuation bias, the average residuals of the simulated events (i.e., event terms) are generally within the scatter of empirical event terms, although the ShakeOut simulation appears to be a high static stress drop event. The intra-event dispersion in the simulations is lower than NGA values at short periods and abruptly increases at 1.0 s due to different simulation procedures at short and long periods. The simulated motions have a depth-dependent basin response similar to the NGA models, and also show complex effects in which stronger basin response occurs when the fault rupture transmits energy into a basin at low angle, which is not predicted by the NGA models. Rupture directivity effects are found to scale with the isochrone parameter.

© 2011 Earthquake Engineering Research Institute

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Keywords

earthquake engineering, fracture

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ARTICLE DATA

History
Received 25 December 2009
Accepted 10 June 2010
Digital Object Identifier
http://dx.doi.org/10.1193/1.3583644

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8755-2930 (print)  

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