Three-dimensional structure, ground rupture hazards, and static stress models for complex non-planar thrust faults in the Ventura basin, southern California

Alex Hughes, Rebecca Bell, Zoe K. Mildon, Dylan H. Rood, Alexander C. Whittaker, Thomas K. Rockwell, Yuval Levy, Duane E. DeVecchio, Scott T. Marshall, & Craig Nicholson

Under Review February 6, 2020, SCEC Contribution #10025

To investigate the subsurface geometry of a recently discovered, seismically-active fault in the Ventura basin, southern California, USA, we present a series of cross sections and a new three-dimensional fault model across the Southern San Cayetano fault (SSCF) based on integration of surface data with petroleum industry well-log data. Additionally, the fault model for the SSCF, along with models of other regional faults extracted from the Southern California Earthquake Center three-dimensional Community Fault Model, are incorporated in static Coulomb stress modeling to investigate static Coulomb stress transfer between complex geometry thrust faults and to further our understanding of stress transfer in the Ventura basin. The results of the subsurface well investigation provide evidence for a low-angle SSCF that dips ~15° north and connects with the western section of the San Cayetano fault around 1.5–3.5 km depth. The results of the static Coulomb stress models are interpreted to partly explain contrasting geomorphic expression between different sections of the San Cayetano fault and a potential mismatch in timings between large-magnitude uplift events suggested by paleoseismic studies on the Pitas Point, Ventura, and San Cayetano faults. In addition to new insights into the structure and potential rupture hazard of a recently discovered active reverse fault in a highly populated area of southern California, this study provides a simple method to model static Coulomb stress transfer on complex geometry faults in fold and thrust belts.

Citation
Hughes, A., Bell, R., Mildon, Z. K., Rood, D. H., Whittaker, A. C., Rockwell, T. K., Levy, Y., DeVecchio, D. E., Marshall, S. T., & Nicholson, C. (2020). Three-dimensional structure, ground rupture hazards, and static stress models for complex non-planar thrust faults in the Ventura basin, southern California. JGR:Solid Earth, (under review).