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.

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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.

The last of the quakes was felt in Oakland and areas of Concord.

All of them were centered about 2.5 miles southeast of San Ramon, the USGS said.

The quakes are the latest during a flurry of them that have occurred over the past month.

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 s

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