A trench at the Bidart Fan sector of the San Andreas fault.
Researchers find major quakes on the southern section, on average, every 88 years — three times as often as previously thought. It’s the strongest evidence yet that we’re overdue for a massive quake. Southern California is long overdue for a major earthquake along the San Andreas fault, according to a landmark study of historic seismic activity released August 20, 2010.
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