A magnitude-5.1 earthquake struck in Southern California on Saturday and could be felt dozens of miles away in downtown Los Angeles, but there were no immediate reports of injuries or damage. The quake struck at 12:18 p.m. (1618 GMT) and was centered about 85 miles northwest of downtown Los Angeles, according to a preliminary report from the U.S. Geological Survey. There were no immediate reports of damage or injuries, a Kern County Sheriff's Department supervisor said. A spokesman for the Los Angeles city fire department said he received no damage reports.