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News From the Field

Tremors on Southern San Andreas Fault May Mean Increased Earthquake Risk

July 9, 2009

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Tremors under the Parkfield segment of the San Andreas Fault have increased, with increasing stress on a nearby locked segment of the fault, perhaps signaling a greater chance of an earthquake. The tremors, like a constant, low-level rumble, increased after quakes in 2003 and 2004, and are at the end of a segment that last ruptured in 1857 in a 7.8 magnitude quake. Full Story

University of California, Berkeley

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