"SAN RAMON - A calm from the recent weeks of shaking ground was interrupted Monday morning when eight more earthquakes struck the Tri-Valley area in less than hour, according to the U.S. Geological Survey. The most violent of the earthquakes was a magnitude 4.2 shaker that was centered about 2½ miles southeast of downtown San Ramon. Two of the quakes measured 2.5 while the other three were were 3.9, 3.3 and 2.8."
"The first one shook at 6:27 a.m., while the last of the five happened at 7:07 a.m., according to the USGS. The 4.2 shaker could be felt as far away as Concord and on the Peninsula. Those quakes follow a 3.1 quake that happened Friday morning that was centered about 3 miles southeast of the city. Until the quake Friday, an earthquake swarm that had delivered 91 earthquakes of magnitude 2.0 and above since Nov. 9 appeared that it might be over."
Eight earthquakes struck the Tri-Valley area in less than an hour. The largest measured magnitude 4.2 and was centered about 2.5 miles southeast of downtown San Ramon. Two quakes measured 2.5, and others measured 3.9, 3.3 and 2.8. The first tremor occurred at 6:27 a.m. and the last in that sequence occurred at 7:07 a.m. The 4.2 event was felt as far away as Concord and the Peninsula. Those events followed a 3.1 quake Friday and an earlier swarm that produced 91 quakes of magnitude 2.0 and above since Nov. 9. No immediate reports of injuries or damage were received.
Read at The Mercury News
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