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A new study is raising the risk of another earthquake in the San Francisco Bay Area. Researchers at Stanford University have found at least two new fault lines. They’re east of the San Andreas Fault and run from south of Gilroy through Silicon Valley, past Palo Alto. Experts say either are capable of producing a six-point-nine earthquake every 250 to 300 years, much like what hit near Loma Prieta Peak in 1989.