photo credit: UC Berkeley Seismology Lab
UC Berkeley Seismology lab map shows seismic detection of a 4.2 magnitude
earthquake detected near Cobb, CA, on Thursday, 7 May, 2026.

A magnitude 4.2 earthquake shook parts of the North Bay early Thursday morning, according to the U.S. Geological Survey.

The quake struck at 2:42 a.m. near Cobb in Lake County, at a depth of about 3 kilometers, or 1.9 miles, the USGS said.

The epicenter was about 13 miles north-northeast of Healdsburg, 14 miles southwest of Clearlake and roughly 17 miles north of Windsor, according to seismologists.

There were no immediate reports of injuries or damage.