![]() However, according to some of his reports from 18, Lawson actually named it after the surrounding San Andreas Valley. ![]() It is often described as having been named after San Andreas Lake, a small body of water that was formed in a valley between the two plates. The fault was identified in 1895 by Professor Andrew Lawson of UC Berkeley, who discovered the northern zone. The slip rate along the fault ranges from 20 to 35 mm (0.79 to 1.38 in)/yr. The fault divides into three segments, 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, and its motion is right-lateral strike-slip (horizontal). The San Andreas Fault is a continental transform fault that extends roughly 1,200 kilometers (750 mi) through California. Plaque showing location of San Andreas Fault in San Mateo County
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