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A San Bernardino County Sheriff's dispatcher in nearby Rancho Cucamonga said the station shook for a few seconds, but there were no calls about damage or injuries.
A small 2.0 magnitude aftershock hit about a half-mile away about two minutes later, the USGS said. That was followed by a 1.8 magnitude shock at 8:14 a.m.
Dr. Lucy Jones with the USGS said the quake was located in an area where three faults come together.
Some buildings swayed in downtown Los Angeles, about 60 miles to the west, and residents reported shaking along the beaches.