The San Andreas fault

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The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 miles) through California. It forms the tectonic boundary between the Pacific Plate and the North American Plate, stretching from the Gulf of California in the south to Cape Mendocino in the north. It does not accommodate all the motion between the Pacific and North American Plates, as there are other faults and geological processes at play. Additionally, the San Andreas Fault is not presently inactive; it is considered very active and capable of producing significant earthquakes.