Three minor earthquakes struck Friday morning in San Ramon, the latest cluster of quakes to shake the same area in the Tri-Valley region over the last several weeks.
A 3.0 magnitude earthquake struck at 8:14 a.m., followed by a 2.8 and 2.6 magnitude quakes at 8:16 and 8:18 a.m., respectively, according to preliminary data from the U.S. Geological Survey. The quakes were centered in a residential area just south of Bollinger Canyon Drive between Dougherty Road and Alcosta Boulevard.
The area is the same general vicinity where a series of minor quakes have been occurring since November, with the largest being a 4.0 magnitude on December 19, 2025.
None of the earthquakes in the active swarm has been strong enough to cause significant damage.
This is a breaking news update. More information to be added as available.
