The US Geological Survey said the quake occurred at 12:13 p.m.
It was centered five miles north northeast of Lake Pillsbury and 22 miles north of Upper Lake, at a depth of 8.8 miles, the survey reported.
By late Thursday, the US Geological Survey received eight shake reports from five zip codes – Willits, San Jose, Milpitas, Berkeley and San Bruno.
A 3.1-magnitude quake occurred four miles north northeast of Lake Pillsbury on May 2, as Lake County News has reported.
E-mail Elizabeth Larson at