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The Hosgri Fault is an offshore fault zone located near the coast of Southern California. It stretches for about 140 kilometers and the communities closest to it are Cambria, San Simeon, Morro Bay, and Surf. It affected California in 1927 when a 7.3 magnitude earthquake occurred.

As shown on the map at left, the predicted probability of a major earthquake on this fault within the next 30 years is relatively low, only 3%.

Fault Information
The Hosgri Fault is a component of the San Andreas Fault system. It is a reverse and thrust fault with possible magnitudes of 6.5 and 7.5 on the Richter scale. Seismologists monitor activity on the Hosgri fault constantly because of its physical proximity to the Diablo Canyon nuclear power plant. In fact, the fault lies only 2-1/2 miles offshore from the plant site.

Fault History
The Hosgri Fault's last major earthquake occurred on November 4, 1927. The magnitude of the quake was 7.3 on the Richter scale.