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Sunday, August 22, 2010

Big quakes more frequent than thought on San Andreas fault

Earthquakes have rocked the powerful San Andreas fault that splits California far more often than previously thought, according to UC Irvine and Arizona State University researchers who have charted temblors there stretching back 700 years.

The findings, to be published in the Sept. 1 issue of Geology, conclude that large ruptures have occurred on the Carrizo Plain portion of the fault — about 100 miles northwest of Los Angeles — as often as every 45 to 144 years. But the last big quake was in 1857, more than 150 years ago.

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