THIS QUAKE HAS BEEN UPGRADED TO 3.4 MAGNITUDE BY THE US GEOLOGICAL SURVEY.

LAKE PILLSBURY – A 3.4-magnitude earthquake was reported in the Lake Pillsbury area on Tuesday afternoon.

The quake, which occurred at 2:21 p.m., was centered 11 miles northwest of Lake Pillsbury, 25 miles north of Ukiah, 35 miles east of Fort Bragg and 45 miles northwest of Clearlake, the US Geological Survey reported.

Survey instruments measured the quake at a depth of three miles.

The US Geological Survey received 11 shake reports from four zip codes – Potter Valley, Willits, Redwood Valley and Ukiah.

Three more quakes centered in the same area – and ranging between magnitude 1.5 and 2.5 – followed over a two-hour period, survey records showed.

The last time a quake measuring magnitude 3 or above was reported near Lake Pillsbury was last December, when a 3.0-magnitude quake was reported 17 miles north northeast of the lake, as Lake County News has reported.

E-mail Elizabeth Larson at This email address is being protected from spambots. You need JavaScript enabled to view it. . Follow Lake County News on Twitter at http://twitter.com/LakeCoNews and on Facebook at http://www.facebook.com/pages/Lake-County-News/143156775604?ref=mf .