CONCORD (CBS SF) — An earthquake with a preliminary magnitude of 2.5 struck near Concord Monday afternoon, according to the U.S. Geological Survey.

The temblor was reported at 2:52 p.m. about a mile west-northwest of Concord, USGS officials said.

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The quake had a depth of 10 miles, according to the USGS.

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An earthquake of the same magnitude struck about 24 hours earlier in another part of Contra Costa County near the unincorporated community of Blackhawk.

More: KPIX Earthquake Page

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