Catchings et al. (1998) hypothesized that several shallow faults (<100 m deep) and two deeper reverse faults (∼400–1500 m deep) cut through gently dipping bedding in the core of a broad syncline below Potrero Canyon based on shallow, high-resolution, seismic-reflection profiles modeled from a seismic line completed by the U.S. Geological Survey (USGS) in 1994 following the Northridge, California, earthquake. Catchings et al. (1998) then attempted to correlate the faults with ground cracking produced in Potrero Canyon by the earthquake and with the Oak Ridge fault system based on map relations and projection of the profiles...

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