The South Napa Earthquake occurred on August 24, 2014, with a Magnitude of 6.0. The earthquake lies within a 70-km-wide (44 miles) set of major faults of the San Andreas Fault system that forms the boundary between the Pacific plate and North American tectonic plate. The persistent northwestward movement of the Pacific plate relative to North America primarily causes right-lateral slip across the major faults, but also causes deformation between the major faults.
The ongoing complex deformation field is revealed by modern geodetic surveys and earthquake patterns as well as regional geologic structure. The earthquake is located in the north of San Pablo Bay between two major active fault systems: the Hayward-Rodgers Creek Fault system on the west and the Concord-Green Valley Fault system on the east.
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