A 6.4-magnitude earthquake rocked coastal Northern California early Tuesday, causing injuries and widespread damage, and knocking out power to tens of thousands.The quake struck at 2:34 a.m. in the Pacific Ocean about 15 kilometers from Ferndale in Humboldt County, according to the U.S. Geological Survey. The town is near the Oregon border with some 1,300 residents.Two injuries were confirmed after the quake, and "multiple reports of additional injuries have been received and are being verified," the Humboldt County Sheriff's Office reported on its website.Damage was widespread to roads and homes, especially in the Eel River Valley, according to the county Office of Emergency Services.More than 80 aftershocks were reported later Tuesday morning. There were no fatalities, officials said.There was a 13 percent chance of an aftershock of magnitude 5 or larger within the next week, said an expert of the California Earthquake Clearinghouse.This is the second year in a row a large quake has struck the area on Dec. 20, with last year's 6.2 afternoon temblor hitting off the coast of Humboldt County, according to a report by the San Francisco Chronicle.A 6.4-magnitude earthquake rocked coastal Northern California early Tuesday, causing injuries and widespread damage, and knocking out power to tens of thousands.The quake struck at 2:34 a.m. in the Pacific Ocean about 15 kilometers from Ferndale in Humboldt County, according to the U.S. Geological Survey. The town is near the Oregon border with some 1,300 residents.Two injuries were confirmed after the quake, and "multiple reports of additional injuries have been received and are being verified," the Humboldt County Sheriff's Office reported on its website.Damage was widespread to roads and homes, especially in the Eel River Valley, according to the county Office of Emergency Services.More than 80 aftershocks were reported later Tuesday morning. There were no fatalities, officials said.There was a 13 percent chance of an aftershock of magnitude 5 or larger within the next week, said an expert of the California Earthquake Clearinghouse.This is the second year in a row a large quake has struck the area on Dec. 20, with last year's 6.2 afternoon temblor hitting off the coast of Humboldt County, according to a report by the San Francisco Chronicle.