A preliminary 4.0-magnitude earthquake struck near Ontario this morning, according to the U.S. Geological Survey. The quake hit at 3:51 a.m. Sunday with an epicenter of 2.8 miles northwest of Ontario. Shaking was reported in Los Angeles, Santa Monica, Torrance, Redondo Beach, and Culver City. It was followed by a 2.5-magnitude aftershock at 4:04 a.m., also near Ontario, according to the USGS.