![]() Sediment deposited by the Colorado River is preventing the trough from being filled in with sea water from the gulf. In this region (known as the Salton Trough), the plate boundary has been rifting and pulling apart, creating a new mid-ocean ridge that is an extension of the Gulf of California. Here, the plate motion is being reorganized from right-lateral to divergent. In the south, the fault terminates near Bombay Beach, California in the Salton Sea. It has been hypothesized that a major earthquake along the subduction zone could rupture the San Andreas Fault and vice versa. In the north, the fault terminates offshore near Eureka, California at the Mendocino Triple Junction, where three tectonic plates meet. The average slip rate along the entire fault ranges from 20 to 35 mm (0.79 to 1.38 in) per year. ![]() Traditionally, for scientific purposes, the fault has been classified into three main segments (northern, central, and southern), each with different characteristics and a different degree of earthquake risk. It forms the tectonic boundary between the Pacific Plate and the North American Plate. The San Andreas Fault is a continental right-lateral strike-slip transform fault that extends roughly 1,200 kilometers (750 mi) through the Californias. ![]() Plaque showing location of San Andreas Fault in San Mateo County San Francisco, San Bernardino, San Juan BautistaĬalaveras, Hayward, Elsinore, Imperial, Laguna Salada, San Jacintoġ857, 1906 ( M w ≈7.8), 1957 ( M w 5.7), 1989 ( M w ≈6.9), 2004 Arrows show relative motion of the North American Plate (southeastward) and the Pacific Plate (northwestward)ģ5☀7′N 119☃9′W / 35.117°N 119.650°W / 35.117 -119.650
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