The San Andreas Fault is a major fracture of the Earth’s crust in extreme western North America, trending northwestward for more than 1,300 km (800 miles) from the northern end of the Gulf of California through western California in the United States. It marks the boundary between the Pacific and North American tectonic plates, which slowly slide past each other. Their movement produces earthquakes, making the fault one of the world’s best-known seismic zones.
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