A series of small earthquakes that have struck east of San Francisco since last week continue to rattle the region.
KGO-TV reported Tuesday that the largest one so far, a magnitude-3.5 temblor struck around 4:20 p.m. Monday, according to the U.S. Geological Survey. No injuries or major damage has been report
A weaker one, measuring 2.5 magnitude, hit about 5:45 p.m. Monday
Later, about 9:30 p.m., a 2.9 and 2.8 earthquake struck the area less than a minute apart, the station reports.
There have now been more than 200 quakes in the past week.
All were centered around San Ramon on either the Calaveras Fault, or off-shoots of it.
Seismologists still say that swarms are not unusual and not cause for any extra concern.
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