Community Fault Model (CFM) for Southern California

Andreas Plesch, John H. Shaw, William A. Bryant, Sara Carena, Michele L. Cooke, James F. Dolan, Gary S. Fuis, Eldon M. Gath, Lisa B. Grant Ludwig, Egill Hauksson, Thomas H. Jordan, Marc J. Kamerling, Mark R. Legg, Scott C. Lindvall, Harold Magistrale, Craig Nicholson, Nathan A. Niemi, Michael E. Oskin, Suzanne C. Perry, George Planansky, Thomas K. Rockwell, Peter M. Shearer, Christopher C. Sorlien, Michael Peter Suess, John Suppe, Jerome A. Treiman, & Robert S. Yeats

Published December 2007, SCEC Contribution #1134

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.

Plesch, A., Shaw, J. H., Bryant, W. A., Carena, S., Cooke, M. L., Dolan, J. F., Fuis, G. S., Gath, E. M., Grant Ludwig, L. B., Hauksson, E., Jordan, T. H., Kamerling, M. J., Legg, M. R., Lindvall, S. C., Magistrale, H., Nicholson, C., Niemi, N. A., Oskin, M. E., Perry, S. C., Planansky, G., Rockwell, T. K., Shearer, P. M., Sorlien, C. C., Suess, M., Suppe, J., Treiman, J. A., & Yeats, R. S. (2007). Community Fault Model (CFM) for Southern California. Bulletin of the Seismological Society of America, 97(6), 1793-1802. doi: 10.1785/0120050211.