Its effects could be felt as far east as Highland, south to Camp Pendleton, west into Lakewood, and as far north as Azusa, according to the USGS shake map. A preliminary 3.5 earthquake strikes ...

That was later followed by a 3.9 earthquake at 10:34 a.m., with its center about 4.4 miles southeast of Ontario and 4.7 miles northwest of Jurupa Valley in Riverside County.

A minor, 3.3-magnitude earthquake struck in Northern California on Monday, according to the United States Geological Survey.

Back to back earthquakes rattle Ontario The first earthquake happened shortly after 10 a.m. in Ontario at a magnitude of 3.5; the second struck at 10:34 a.m. in Ontario and had a magnitude of 3.9.

Two small earthquakes occurred near Ontario Saturday morning. At 10:05 a.m., a magnitude 3.5 earthquake struck 3.1 miles southeast of the city, followed by a 3.9 magnitude quake at 10:34 a.m. that ...

A magnitude 3.5 earthquake was reported less than a mile south of Ontario International Airport early Wednesday afternoon, the U.S. Geological Survey says.

A magnitude-3.5 earthquake centered two miles southeast of Ontario struck at 12:56 p.m. on Tuesday, Oct. 1, the US Geological Survey said. The quake was felt in Victorville, Riverside, Los Angeles ...

Two earthquakes struck near Ontario within 30 minutes on Saturday morning, with a magnitude of 3.5 and 3.9, respectively, according to the U.S. Geological Survey.

The 4.0 on Oct. 1 “woke me up,” says Alan Wapner, an Ontario councilmember. “It didn’t feel like a shake. It felt like an explosion. It hit hard.

A 4.0-magnitude earthquake near Ontario shook parts of Southern California on Sunday morning, Oct. 6, the U.S Geological Survey reported. The quake, at 3:51 a.m., was centered at 4.3 miles ...