The kind of plate boundary in San Andreas fault is transform plate boundary.
The San Andreas Fault, a major crustal fault in the far west of North America. The fault runs more than 800 miles (1,300 km) northwest from the northern end of the Gulf of California in western California, United States, into the sea into the Pacific Ocean near San Francisco. Tectonic motion along the fault line is associated with infrequent large earthquakes originating near the surface along its path, including the catastrophic San Francisco earthquake of 1906, a Less severe events there in 1989 and a powerful and destructive earthquake concentrated in the Los Angeles suburbs of Northridge in 1994 that occurred along one of the largest secondary faults in San Andreas.
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