New Year's Day Earthquake Jolts San Ramon — Again: Did You Feel It?

SAN RAMON, CA — A 3.2-magnitude earthquake rattled San Ramon yet again on New Year’s Day, according to the U.S. Geological Survey.

The quake struck at 4:58 p.m. Thursday, and was centered about 5 miles underground. USGS data places the epicenter in a residential area near Vista Pointe Circle and Canyon Lakes Drive.

Thursday’s reported quake adds to a series of earthquakes in or near San Ramon — the most recent on Monday, when a 2.2 magnitude earthquake lightly shook the area at 5:45 a.m.

More quakes hit Christmas Eve, Dec. 23, and Dec. 20, following another series of tremblors in under 24 hours.

The quakes are part of an ongoing swarm during an unusually active period of seismic activity in the area. Over the past month alone, San Ramon has experienced more than 150 earthquakes—its second-highest total in nearly half a century. Since November, that number totals more than 300 earthquakes, according to USGS.

San Ramon sits along the Calaveras Fault, where several smaller faults branch off the main fault line. Movement of fluids such as water or gas through networks of tiny cracks in these micro-faults can trigger dozens of small earthquakes in rapid succession.

SEE ALSO:

• San Ramon Hit With Another Quake
• San Ramon Hit With Christmas Eve Earthquake, The Latest Of More Than 300 Since November
• San Ramon Details Earthquake Readiness Policies
• San Ramon Hit By Quakes For Third Time In Under 24 Hour
• Earthquake Swarm Rattles San Ramon For The Third Time This Week
• Why Does San Ramon Get So Many Earthquakes?

Michael Wittner and Kat Schuster contributed to this report.