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“The Great 1857 Fort Tejon Earthquake: The Last “Big One”, Date/Time: January 9, 1857 about 8:20am PST, Magnitude Mw 8.0 approximately Location/Depth: 35.72N 120.32W, Descriptive location: 45 miles NE of San Luis Obispo, Faulting type: right-lateral strike-slip, Faults involved: San Andreas Fault, Length of surface rupture: about 225 miles (360 km), Maximum surface offset about 30 ft (9 meters)”
http://earthquake.usgs.gov/earthquakes/events/1857sca/

USGS Earthquakes over last week (dots), with earthquake hazard UCERF-3/USGS (lines), and Diablo Canyon Nuclear Power Station and San Onofre Nuclear Power Station (More detailed maps below)

“The San Andreas fault, which is more than 700 miles (1100 km) in length, is the boundary between the Pacific and North American tectonic plates…”

San Andreas Fault Photo by Scott Haefner, USGS
“On January 9, 1857, the M 7.9 Fort Tejon earthquake occurred just north of the Carrizo Plain. At Wallace Creek, in the Carrizo Plain…