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Quake Shakes East Bay

An earthquake with a preliminary magnitude of 3.9 sent a sharp, short jolt through the San Francisco Bay area Thursday night.

The US Geological Survey says the quake was centered near Piedmont, a densely populated suburb 12 miles east of San Francisco. The quake struck around 6:40 p.m.

Police in Oakland and Piedmont say there are no reports of damage or injuries.

Chevron officials were monitoring a small fire at their East Bay refinery just before the temblor struck. They didn´t realize the jolt was just a small quake and hit the sirens, signaling residents to take shelter. But, the fire was out and all was clear by 7:00 p.m.

An aftershock with a preliminary magnitude of 3 shook the same area about an hour later.

A USGS seismologist says the quake was probably on the Hayward fault.