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Community Fault Model (CFM) for Southern California

Department of Earth and Planetary Sciences, Harvard University, 20 Oxford St., Cambridge, Massachusetts 02138

William A. Bryant, Sara Carena, Michele Cooke, James Dolan, Gary Fuis, Eldon Gath, Lisa Grant, Egill Hauksson, Thomas Jordan, Marc Kamerling, Mark Legg, Scott Lindvall, Harold Magistrale, Craig Nicholson, Nathan Niemi, Michael Oskin, and Sue Perry

Southern California Earthquake Center (SCEC), University of Southern California, 3651 Trousdale Parkway, Suite 169, Los Angeles, California 90089-0742

George Planansky

Department of Earth and Planetary Sciences, Harvard University, 20 Oxford St., Cambridge, Massachusetts 02138

Thomas Rockwell, Peter Shearer, and Christopher Sorlien

Southern California Earthquake Center (SCEC), University of Southern California, 3651 Trousdale Parkway, Suite 169, Los Angeles, California 90089-0742

M. Peter Süss

Department of Earth and Planetary Sciences, Harvard University, 20 Oxford St., Cambridge, Massachusetts 02138

John Suppe, Jerry Treiman, and Robert Yeats

Southern California Earthquake Center (SCEC), University of Southern California, 3651 Trousdale Parkway, Suite 169, Los Angeles, California 90089-0742

We present a new three-dimensional model of the major fault systems in southern California. The model describes the San Andreas fault and associated strike-slip fault systems in the eastern California shear zone and Peninsular Ranges, as well as active blind-thrust and reverse faults in the Los Angeles basin and Transverse Ranges. The model consists of triangulated surface representations (t-surfs) of more than 140 active faults that are defined based on surfaces traces, seismicity, seismic reflection profiles, wells, and geologic cross sections and models. The majority of earthquakes, and more than 95% of the regional seismic moment release, occur along faults represented in the model. This suggests that the model describes a comprehensive set of major earthquake sources in the region. The model serves the Southern California Earthquake Center (SCEC) as a unified resource for physics-based fault systems modeling, strong ground-motion prediction, and probabilistic seismic hazards assessment.

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