Earthquake swarm strikes San Ramon area Friday night

SAN RAMON — A cluster of earthquakes struck the San Ramon area Friday night, continuing a pattern of seismic activity in recent weeks, according to the U.S. Geological Survey.

Things kicked off at 7:41 p.m. with a magnitude 2.5 centered 3.1 miles southeast of the city.

It was followed by a pair of quakes at 7:49 p.m. — a magnitude 4.0 centered 3.1 miles southeast of the city and a magnitude 3.8 centered 2.4 miles southeast of the city.

Another magnitude 4.0 quake struck at 7:56 p.m., nearly 3 miles southeast of the city.

The swarm continued a minute later with a magnitude 3.1 centered 2.6 miles southeast of the city. And a magnitude 2.9 struck at 8:10 p.m., nearly 2.5 miles southeast of the city.

While there were no immediate reports of injuries or damage, BART said it was running trains at reduced speeds while it completed safety inspections. Delays were expected.

Check back for updates.

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