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Three minor earthquakes strike Black Hills near Mount Diablo

The U.S. Geological Survey reported three minor earthquakes between Saturday evening and Sunday morning in the Black Hills area south of Mount Diablo.

The largest was a 2.5 magnitude earthquake that occurred at 10:38 p.m. Saturday about 2.5 miles north-northeast of Blackhawk. The epicenter sits between Mount Diablo State Park and Morgan Territory Regional Preserve. The quake’s center depth was recorded at about 5.5 miles.

A magnitude 2.1 preceded at 6:48 p.m. Saturday and another magnitude 2.2 followed early Sunday at 3:27 a.m.

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