A preliminary 3.0 magnitude earthquake struck Thursday night near Discovery Bay, according to the United States Geological Survey.
The earthquake hit at about 9:58 p.m. and it was centered about 1 mile southwest of Discovery Bay and 5.2 miles east-southeast of Brentwood, the USGS said.
A 3.5 magnitude earthquake happened around the same area Wednesday evening.
No other information was immediately available.
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