The agency says the magnitude-3.2 earthquake hit about 12:43 a.m. and
had its epicenter about a half mile from San Ramon, which is east of San
Francisco.
The earthquake is the latest of a swarm of small earthquakes that has
been rattling the area, with more than 200 recorded since last week.
All the previous quakes were centered around the city of San Ramon on
either the Calaveras Fault or offshoots of it. The largest struck Monday
and was logged as a magnitude-3.5, according to the U.S. Geological
Survey. No injuries or major damage have been reported.
Experts say such swarms are not unusual or cause for extra concern.
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