PETROLIA, Calif. (AP) - Officials say a magnitude-6.0 earthquake has struck off the coast of Humboldt County. The U.S. Geological Survey reports that the temblor hit at 12:20 p.m. about 35 miles northwest of the town of Petrolia and nearly 50 miles west of Eureka. A employee at the Humboldt County Sheriff's Office says there are no immediate reports of major injury or damage. Humboldt County spokesman Phil Smith-Hanes says he felt a rolling sensation, but the movement didn't feel as severe as the magnitude-6.5 quake that struck the same area Jan. 9. (Copyright 2010 by The Associated Press. All Rights Reserved.)