A Los Angeles County Fire Department dispatcher said no damage or injuries were reported as a result of the quake.
The temblor struck at 2:36 a.m. at a depth of seven miles 163 miles south-southwest of Avalon in an area of shallow faulting where "the Pacific (tectonic) plate moves to the northwest with respect to the North American plate...'' according to a USGS statement.
It has been more than 40 years since an earthquake has struck in that part of the ocean, according to the USGS.
The quake was felt over a wide area from Ventura to Lancaster in the north to Ensenada and Mexicali, Mexico, in the south, according to the USGS.
"It was a mild rolling for probably about 10-15 seconds," said Sgt. Robert Renteria of the Los Angeles County sheriff's Avalon Station. "We didn't receive one call from anyone."