A series of mostly smaller quakes that awakened San Ramon residents on Monday continued to rattle the area by late morning.
Monday’s quake swarm began with a 3.8 shaker at 6:27 a.m. Since then, two dozen quakes above 2.5 magnitude have been recorded in the area — the largest a 4.2 jolt just after 7 a.m., according to the U.S. Geological Survey.
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