Notable Earthquake of the Week

Fort Tejon M 7.8 - M 8.0 Earthquake, January 17, 1994

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At 8:24 am, Jan. 9, 1857, a very strong earthquake occurred on the San Andreas Fault in Central California.
The Great Fort Tejon earthquake, one of California's largest historic quakes, is estimated to have measured about M 7.8-8.0 and registered shaking intensities of X-XII on the Modified Mercalli scale (a relative intensity rating from 1-12 shown in Roman numerals).
Violent shaking is estimated to have lasted 1-3 minutes! The earthquake caused over 230 miles of surface ruptures, from Parkfield to south of Wrightwood near Cajon Pass, with maximum horizontal fault displacements of 9.5 meters (about 32 feet). Some vertical displacement were measured.
Damage was severe along the fault, but only moderate damage was reported in Los Angeles, centered about 40 miles from the fault and then a city of only 4,000. The quake caused two deaths and several injuries.
It was preceded by several slight to moderate foreshocks and followed by an intense aftershock sequence that included at least two events in the M 6.0 range on Jan. 9 and Jan. 16, both of which caused additional damage and injury.

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