Glen Ellen, CA – Residents across Sonoma County and the northern Bay Area reported shaking Sunday night after two earthquakes struck near Glen Ellen within minutes of each other, including a stronger magnitude 4.0 quake that was felt across a wide region.
According to the U.S. Geological Survey, the first earthquake, a magnitude 3.1, occurred at 3:38 p.m. PST Sunday, centered about 6 kilometers west-northwest of Glen Ellen at a shallow depth of approximately 2.2 kilometers. Just five minutes later, a stronger magnitude 4.0 earthquake struck roughly 6 kilometers west of Glen Ellen, with a depth of about 1.9 kilometers.
The shallow depth of both earthquakes likely contributed to stronger shaking near the epicenter. The USGS Community Internet Intensity Map showed reports of moderate shaking (Level VI) in parts of Sonoma County, with lighter shaking felt across portions of the North Bay, including Santa Rosa, Napa Valley, and surrounding communities.
The USGS ShakeMap rated overall shaking as light to moderate, and the agency’s PAGER system indicated a green alert, meaning damage is expected to be minimal and economic losses are likely low. As of Sunday night, no injuries or major damage had been reported.
The USGS Aftershock Forecast estimates an 18% chance of additional magnitude 3.0 or greater aftershocks within the next week, though the likelihood of larger aftershocks remains low.
California is seismically active, and officials remind residents to remain prepared. If aftershocks occur, residents should Drop, Cover, and Hold On, and inspect homes for any signs of damage before re-entering unsafe areas.
