A pair of modest earthquakes shook Southern California on Saturday morning, with epicenters in Ontario.
The quakes, of magnitude 3.5 and 3.9, occurred about a half-hour apart. Shaking was felt as far away as Los Angeles, Orange County and northern San Diego County, according to crowdsourced reports submitted to the U.S. Geological Survey.
The USGS said that near the epicenter, which included Ontario International Airport, there was “light” shaking, as defined by the modified Mercalli intensity scale. A light tremor is enough to rattle windows and dishes and can cause parked cars to shake noticeably.
“Weak” shaking may have been felt as far away as Los Angeles, the San Gabriel Valley, Long Beach, Orange County, Riverside and San Bernardino.
The first quake struck near Archibald Avenue and Brookside Street at 10:05 a.m. Saturday, and was followed by a larger quake about three-fifths of a mile northeast, with its epicenter at Highway 60 and South Oak Hill Drive.
The Ontario Police Department said there were no immediate reports of damage.
In Rowland Heights, one resident felt his desk shake violently for a few seconds. The shaking was so strong that he initially thought someone might have crashed into the house.
