Overview
- USGS recorded a magnitude 4.2 quake shortly after 7 a.m. Monday following an initial 3.9 event reported around 6:27 a.m.
- More than a dozen additional tremors struck over the next hour in a tight cluster southeast of San Ramon.
- The strongest quake’s epicenter was about 2.5 miles southeast of San Ramon at a depth near six miles, according to USGS data.
- Shaking was felt across San Francisco and East Bay cities including Oakland and Richmond, with no immediate reports of major damage or injuries.
- BART briefly reduced train speeds for routine track inspections, and recent analyses show the area logged 87 magnitude-2-or-larger quakes in November and December.