A low intensity earthquake of magnitude 4.4 hit area of Southern California near San Bernardino on Tuesday night, giving a start to thousands across a heavily populated area with more than one person comparing it to a rumbling big rig.
There were no immediate reports of damages or injuries, however.
The quake hit San Bernardino about 5:38 p.m. at a depth of about three miles, a report from the U.S. Geological Survey said.
Aftershocks of magnitude 3.8 and 3.2 came minutes later, and dozens of tiny aftershocks followed in the next few hours.