![]() ![]() We are now running simulations for a range of possible events distributed along the HF (M W 4-7). ![]() These maps can also be used for corrections to transform intensities from a 1D model to those from the 3D model. We show how path and site effects can be characterized with source-normalized shaking intensity maps by taking the natural log ratio of 3D/1D intensities from the same rupture model. Motions in the USGS 3D model are well-correlated with known geologic/seismic features. Recently, we have run several realizations of moment magnitude, M W, 7.0 Hayward Fault (HF) earthquakes. SW4 simulations include surface topography, attenuation, mesh refinement and 3D seismic properties from a model developed by the USGS. ![]() We are running large-scale simulations (up to 200 billion grid points) of earthquake ground motions in the San Francisco Bay Area (SFBA) with SW4, a 3D finite difference time-domain code based on summation-by-parts. Advances in computational methods and new architectures, particularly Graphics Processing Units (GPU's), enable broadband (0-10 Hz) fully deterministic simulations of earthquake ground motions in regional-scale 3D Earth models. Earthquake ground motion simulations using kinematic rupture models and three-dimensional (3D) Earth models provide estimates of near-fault shaking intensity where empirical data are extremely limited. ![]()
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