
The "most dangerous urban fault in America," scientists say, is the Hayward Fault, which runs under densely populated areas in the Bay Area including the city of Oakland (see map of California).
The past five major earthquakes along the fault have occurred at regular 140-year intervals. The last one, in 1868, was mostly forgotten in the aftermath of the ruinous 1906 quake, which was triggered by the nearby San Andreas Fault.
But the 1868 event has garnered more distinction recently: October 2008 will mark the 140th anniversary of that magnitude 7 quake.
"Both projections are provocative interpretations of data," Lienkaemper said.
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