Unlike the San Andreas Fault — one of the most heavily studied faults in the world — scientists know comparatively little ...
A 2.5 magnitude earthquake struck near Why, Arizona, on Friday afternoon.
Workers check damage to Interstate 880 in Oakland after it collapsed during the Loma Prieta earthquake in October 1989. (Paul Sakuma / Associated Press) They are two of the West Coast's most ...
Southern California and southwest Arizona are on earthquake alert after a swarm shook Imperial County.
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