SAN RAMON, Calif. (BCN) - The USGS reports that there have been 10 earthquakes in the San Ramon area since 1:46 a.m. Tuesday.
The largest in magnitude happened at 1:46 a.m. It had a depth of 5.7 miles, USGS officials said.
It was measured as a magnitude 3.1 and it shook right along 680 just north of Greenbrook Drive.
Since then, the quakes have been smaller.
There were several magnitude 2.9 quakes.
One was at 2:06 a.m. off El Capitan Drive and Zita Court, and the second 2.9 quake was about 30 minutes later off of Bolero Drive.
The most recent quake was at 5:41 a.m. It was a magnitude 1.5 just north of Borica Drive.
There have been no reports of damage Tuesday morning.
There have been more than 200 small quakes, since the swarm began on October 15th.
The quakes have been occurring along the Calaveras Fault, which intersects with the Hayward Fault.
The 2003 Working Group of California Earthquake Probability, which builds forecasts of earthquakes, said there is an 11 percent chance the Calaveras Fault will produce a 6.7-magnitude earthquake or larger in the next 30 years, according to the USGS.