![]() The Southern San Andreas slices through Los Angeles County along the north side of the San Gabriel Mountains. The cities of Desert Hot Springs, San Bernardino, Wrightwood, Palmdale, Gorman, Frazier Park, Daly City, Point Reyes Station and Bodega Bay rest on the San Andreas fault line. The San Andreas runs deep near and under some of California’s most populated areas. See Your Local Earthquake Risk San Andreas fault line map The two plates crisscross with dozens of active and passive earthquake faults. San Francisco, Sacramento and the Sierra Nevada are on the North American Plate. ![]() San Diego, Los Angeles and Big Sur are on the Pacific Plate. This fault is one of the largest faults in the world, running more than 800 miles from the Salton Sea to Cape Mendocino. Since then, the North American plate has ground against the Pacific plate at a boundary called a strike-slip fault. The San Andreas fault line formed about 30 million years ago as the North American plate engulfed nearly all of the Farallon plate. When we think of the next big earthquake, we think of the San Andreas fault.
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