San Andreas Fault
Zone of transform faults at the boundary between two tectonic plates in the western U.S. The fault runs along the coast of northern California for more than 800 mi (1,300 km) and passes seaward in the vicinity of San Francisco. Movement along the fault is characterized by frequent earthquakes, including the major San Francisco quake of 1906, when parts of the fault line moved as much as 21 ft (6.4 m); the less serious earthquake of 1989; and a destructive quake centred in the Los Angeles suburb of Northridge in 1994.
This entry comes from Encyclopædia Britannica Concise.
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