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Earthquakes: Faults It's not your Fault

SanAndreas Fault Faults are narrow zones in the Earth, usually extending no more than about 10 miles deep, which separate rigid crustal blocks.

A well known fault is the San Andreas Fault which separates the Pacific plate from the North American plate. The Pacific plate has San Fransicso and Los Angeles on it, while the North American plate contains the rest of California and the U.S.

The Pacific plate is moving to the northwest at a rate of about 4 inches per year.