Finite-fault site-specific acceleration time histories that include nonlinear soil response

Details Finite-fault site-specific acceleration time histories that include nonlinear soil response Finite-fault site-specific acceleration time histories that include nonlinear soil response

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003pepi..137..153a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 137, Issue 1-4, p. 153-181.

Physics

1

Scientific paper

To estimate the broadband strong ground motion one might expect at a given site we develop a method that includes heterogeneous slip on a finite-fault, full wave propagation with high frequencies, and site-specific material properties with nonlinear soil response. The faulting is simulated as a stochastic process with the spatial variation of the key parameters determined by probability distribution functions. The wave propagation from source to site is accounted for by using small earthquake recordings as empirical Green's functions (EGF). This accounts for the regional effects of scattering, attenuation and structure while providing the basis for a broadband (0.5-10Hz) time history. Because we are interested in sites where the ground motion is expected to be severe, we have included nonlinear wave propagation through the soil. The material properties of the soil column have been determined from laboratory tests, borehole logs and confirmed through seismological modeling of weak motion. We have computed 240 three-component acceleration time histories to represent the range of ground motion one might expect from a M 6.8 earthquake for a site that is located 10km above the hanging wall of blind thrust (7.1km closest distance). Based on the suite of time histories we computed a S.D. of 0.45 (natural log units) for the acceleration response spectra in the passband 0.5-10Hz. The total S.D. (modeling plus parameterization) is 0.6 in natural log units. The mean acceleration response spectrum is near the median 10% in 50-year probabilistic seismic hazard analysis (PSHA) spectrum for the site; the 84% spectrum of the simulations is closer to the 5% in 50 years median spectrum.

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