Overview
- A magnitude 3.4 earthquake struck a few miles southwest of Brentwood at about 12:25 a.m. Saturday, and the USGS recorded its depth at roughly 11.1 miles.
- People across the East Bay and into the Central Valley reported feeling the shaking, with USGS 'Did You Feel It?' responses from Pleasanton, Danville and as far east as Stockton.
- No injuries or structural damage were reported after the quake, and local and federal agencies are collecting reports and watching for possible aftershocks.
- The USGS has not identified the specific fault that caused the tremor, though the epicenter sits about 2.2 miles northeast of the Marsh Creek–Greenville fault zone.
- Small magnitude‑3 events are common in California and rarely cause harm, and local outlets noted the Chronicle’s first account was generated by an automated alert before reporters added context.