San Gregorio Fault

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The San Gregorio Fault is an active earthquake fault located off the coast of Northern California. The southern end of the fault is in southern Monterey Bay, and the northern end is about 20 km northwest of San Francisco, near Bolinas Bay, where the San Gregorio intersects the San Andreas Fault. Most of the San Gregorio fault trace is located offshore beneath the waters of Monterey Bay, Half Moon Bay, and the Pacific Ocean, though it cuts across land near Point Año Nuevo and Pillar Point. The San Gregorio Fault is part of a system of coastal faults which run roughly parallel to the San Andreas.[1]

U.S. Geological Survey map showing the trace of the San Gregorio Fault in yellow, lower center. From this USGS website.


  1. ^ "The San Andreas Fault System, California (USGS Professional Paper 1515)". United States Geological Survey. 1990. Retrieved 11 December 2008.  (Note: 116MB)