A 4.6-magnitude earthquake rattled Northern California early Saturday but caused no injuries or damage, the U.S. Geological Survey (USGS) said. The quake, centered in the Pacific Ocean off the northern California coast, was felt by some residents in areas such as Eureka and Ferndale in Humboldt County, according to USGS. The quake wasn't strong enough to cause damage, said USGS geophysicist Randy Baldwin. The Humboldt County Sheriff's Department said it received no reports of any injuries or damage from the quake. It was the third quake that struck the area in less than three months. On Jan. 9, a stronger temblor measured at 6.5 magnitude hit the area, to be followed by a magnitude-6.0 quake on Feb. 4. 