The Big One. For decades Californians have lived in fear of the tectonic monster that inhabits the San Andreas Fault, a spectacular, 800-mile-long slash through the earth's surface. But last week's earthquake was a sobering reminder that the mighty San Andreas is not the state's only seismic menace. A web of smaller cracks crisscrosses the fragile California crust. Many of these faults are well known. But others lie hidden deep underground, like the one that gave Los Angeles its latest disaster. Until the earth moved, the residents of the northwestern suburb of Northridge had no idea that a deadly fault lay...
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