Ever since an earthquake nearly destroyed San Francisco in 1906, Californians have dreaded the next Big One. The anxiety has been greatest for those who live near the San Andreas Fault, a dramatic 800-mile-long gash in the earth's surface that comes within one mile of San Francisco and 30 miles of Los Angeles. However, evidence is mounting that this huge fault is only the most visible evidence of a threat that is much broader and more dangerous than once thought. Deep under the Los Angeles basin, the state's most populous region, is a hidden group of faults, cracks in the earth's...
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