A magnitude 3.8 earthquake near Santa Rosa, Sonoma County, California, USA, was reported only 2 minutes ago by the United States Geological Survey, considered the key international and national agency that monitors seismic activity in the US. The earthquake occurred at a very shallow depth of 5.6 miles beneath the epicenter after midnight on Saturday, August 1st, 2026, at 12:57 am local time. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report.Based on the preliminary seismic data, the quake should not have caused any significant damage, but was probably felt by many people as light vibration in the area of the epicenter. Weak shaking might have been felt in Geyserville (pop. 860) located 4 miles from the epicenter, Cloverdale (pop. 8,800) 6 miles away, Windsor (pop. 27,500) 16 miles away, Clearlake (pop. 15,200) 21 miles away, and Santa Rosa (pop. 178,100) 25 miles away.Other towns or cities near the epicenter where the quake might have been felt as very weak shaking include Ukiah (pop. 15,900) located 30 miles from the epicenter, Rohnert Park (pop. 42,400) 32 miles away, Agua Caliente (pop. 27,100) 39 miles away, and Petaluma (pop. 60,400) 40 miles away.Earthquake data: Date & time: Aug 1, 2026 12:57 am (GMT -7) local time (1 Aug 2026 07:57 GMT)Magnitude: 3.8Depth: 9.00 kmEpicenter latitude / longitude: 38.77°N / 122.92°W (Sonoma County, California, United States)Primary data source: USGS