In what has become a common occurrence recently, the ground shook again in San Ramon on Tuesday, this time before sunrise.
The magnitude 3.1 quake rattled the Tri-Valley at 5:53 a.m. and was centered about 3.1 miles southeast of San Ramon. There were no initial reports of damages or injuries.
The quake came only eight days after three earthquakes shook the area in the course of about 100 minutes. More than 30 quakes also were recorded between midnight and 10:15 a.m. on Dec. 8, according to CalTech’s California Earthquake Center.
The biggest of those earthquakes was a magnitude 3.7 shaker. The flurry of earthquakes that day was part of what geologists call an earthquake swarm.
In November, a 10-day period ending Nov. 17 brought 83 earthquakes to a roughly 1-mile radius around San Ramon. Those earthquakes ranged from magnitude 0.6 to 3.8. A 2.5 quake hit the area three days later.
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