As San Francisco commemorates the 25th anniversary of its last serious quake this week, a new report has warned that the city could once again be sitting on top of a ticking seismic time bomb.

Scientists tracking the movements of four highly stressed seismic faults that form part of the Bay Area’s densely populated San Andreas system have discovered worrying surface mobility which suggests that they could burst forth in a major quake at any time.
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The Rim Fire in Yosemite spread to 110,000 acres overnight and threatened power lines and water systems serving the San Francisco area, causing California Governor Jerry Brown to declare a state of emergency. The fire, one of the most ferocious in California history, is just 2 percent contained and is spreading in two directions, threatening both power transmission lines and pumping stations that San Francisco depends on. On Thursday, the Rim Fire tripled in size, a rate of expansion that may be a record for large wildfires.
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