Three earthquakes occurred southeast of San Ramon within roughly 100 minutes, the largest measuring magnitude 3.7 at 9:07 a.m. Smaller shocks of magnitude 2.5 and 2.6 occurred earlier that morning at 7:24 a.m. and 9:05 a.m. The quakes were felt in Oakland and areas of Concord and were centered about 2.5 miles southeast of San Ramon, according to the U.S. Geological Survey. These events follow a recent uptick in activity, including a 10-day seismic swarm that produced 83 earthquakes within about a one-mile radius ending Nov. 17.
"SAN RAMON - A sense of shakiness in the Tri-Valley only grew Monday morning when three earthquakes rattled the area in the course of about 100 minutes."
"The biggest of the quakes was a magnitude 3.7 that shook at 9:07 a.m., according to the U.S. Geological Survey. That quake followed a 2.5 quake at 7:24 a.m. and a 2.6 shaker at 09:05."
"A seismic swarm over a 10-day period ending Nov. 17 brought 83 earthquakes to a roughly 1-mile radius around San Ramon, all of them ranging from 0.6 to 3.8. Then on Nov. 20, a magnitude 2.5 quake hit the same area."
Read at The Mercury News
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