San Francisco - A 3.7 magnitude earthquake shook the San Francisco Bay Area on Wednesday, one day after a stronger temblor rattled the region in a jarring reminder of the area's vulnerability to a "Big One".
No injuries or damage were reported from the quake, which struck near the epicentre of Tuesday's 5.7 magnitude tremor, the most powerful to strike the densely populated region for nearly 20 years.
The United States Geological Survey said Wednesday's quake hit at 3.54pm (22H54 GMT) with its epicentre in the same area as the earlier tremor, near the town of Alum Rock, 82 kilometres (50 kilometres) southeast of San Francisco.
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Tuesday's strike was the biggest seismic shock since a 7.1 quake hit San Francisco in 1989, killing 63 people and destroying a major bridge, California media reported.
The epicentre was close to the the Calaveras Fault, one of at least 10 earthquake faults running through the San Francisco Bay region.
Local reports said Tuesday's shock was felt as far away as the city of Eugene, in the northwestern state of Oregon.
Seismic experts in 2005 warned there is a 62 percent chance of an earthquake measuring at least 6.7 on the Richter Scale of hitting San Francisco in the next 30 years.
San Francisco suffered a 7.8 magnitude quake in 1906 which triggered widespread fires and killed more than 3 000 people. Tens of thousands lost their homes.
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