The quake hit at about 4:30 a.m. The quake was centered 1.3 miles from Pacoima and 1.4 miles north-northeast of San Fernando, USGS said. About two hours later, a 3.8-magnitude aftershock rattled centered near Tujunga rattled the area.
A strong shaking was felt across the San Fernando Valley region, and it was followed by a 3.3 aftershock a few minutes later.
According to a USGS map, the shaking was felt over an area stretching from Palmdale to Anaheim, and from Ontario to Agoura Hills.
There were no immediate reports of serious damage or injuries due to the quake. The Los Angeles Fire Department said it "concluded the systematic survey of the City of Los Angeles by ground and air" and reported no major infrastructure damage or serious injury due to the quake.