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Plaque showing location of San Andreas Fault in San Mateo County. The San Andreas Fault is a continental right-lateral strike-slip transform fault that extends roughly 1,200 kilometers (750 mi) through the U.S. state of California. [1] It forms part of the tectonic boundary between the Pacific plate and the North American plate. Traditionally ...
Simplified fault map of southern California The faults of Southern California viewed to the southeast, as modeled by the Southern California Earthquake Center. Highlighted in purple are the San Andreas Fault (left) and Santa Monica Bay complex (right). The foreground is in the Santa Barbara Channel, the east-trending zone marks the Transverse ...
A U.S. government geologist reported, "They are not of high temperature nor notable flow, however, and are seldom visited. The San Andreas fault line is mapped as passing about 8 miles north of these springs, and its proximity suggests that the existence of the warm water may be due to subsidiary fracturing of the rocks." [14]
In Southern California, the last major earthquake on the San Andreas fault was in 1857, estimated at somewhere around a magnitude 7.8. But even moderate quakes along the Puente Hills thrust fault ...
Scientists believe they may have found a reason why the San Andreas Fault, the largest seismic hazard in California, has been dormant for more than three centuries.. The average timespan between ...
Hughes Lake is a sag pond on the San Andreas Fault in the northern Sierra Pelona Mountains, in Los Angeles County, California. [2] At times the lake goes completely dry for years, as its water supply depends on local winter rain and snowmelt.
On Monday, southern California was rattled by a 4.4-magnitude earthquake that was felt all the way from Los Angeles to San Diego.Though no major damage occurred, the quake was caused by a fault ...
The 1857 Fort Tejon earthquake occurred at about 8:20 a.m. (Pacific time) on January 9 in central and Southern California.One of the largest recorded earthquakes in the United States, [6] with an estimated moment magnitude of 7.9, it ruptured the southern part of the San Andreas Fault for a length of about 225 miles (350 km), between Parkfield and Wrightwood.