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A swarm of magnitude 3.9 earthquakes roared beneath the San Ramon-Danville area on Wednesday, giving local residents a subtle reminder of seismic activity deep in the area.
According to the U.S. Geological Survey, a magnitude 3.9 earthquake followed at 11:43 a.m. followed by a magnitude 2.6 aftershock at 11:46 a.m. A third magnitude 3.0 aftershock at 11:58 p.m. has followed more than a dozen minor earthquakes in the past few hours.