Overview
- The USGS reported a preliminary magnitude between 4.1 and 4.2 with an epicenter about 3 miles west of Glen Ellen around 3:30 p.m. Sunday.
- Shaking was felt in Santa Rosa, Petaluma and Rohnert Park, with no immediate reports of injuries or damage.
- Alerts sounded in San Francisco after an initial automated estimate briefly registered near magnitude 4.9.
- A magnitude 3.1 aftershock was recorded at 3:38 p.m. in roughly the same area, and residents were urged to be prepared for more aftershocks.
- Officials said details remain preliminary as the USGS refines measurements and continues monitoring.