Report: San Andreas Fault Due for 'Big One'

A massive earthquake is overdue at the southern end of the San Andreas Fault, according to a new study. Robert Siegel talks with the author of the study, Yuri Fialko of Scripps Institution of Oceanography at the University of California San Diego, about why Fialko believes such a quake will hit.

According to Fialko's study, which appears in this week's edition of Nature magazine, conditions are right for the Big One to hit a 100-mile segment of the fault that would be felt from San Diego to Los Angeles. But, Fialko admits, the problem is being able to pinpoint when the quake may strike.

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