Community Fault Model (CFM) for Southern California

Abstract

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