A preliminary 4.2 magnitude earthquake occurred late Monday morning in northern Sonoma County near the Lake County line, according to the United States Geological Survey.
The quake occurred at 11:50 a.m. and was Centered 4.7 miles south of Cobb, 12.7 miles northeast of Healdsburg and 14.9 miles south-southwest of Clearlake, the USGS said.
Ref: https://www.nbcbayarea.com