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.

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 ...

Two earthquakes with magnitudes 3.5 and 3.9 rattled the Inland Empire on Saturday. The United States Geological Survey reported the first temblor occurred at 10:05 a.m. in Ontario. The quick jolt ...

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

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.

A magnitude-4.0 earthquake rattled parts of Southern California early Sunday morning. The quake near Ontario was reported at 3:51 a.m.. Shaking was reported in parts of Los Angeles, Whittier ...

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 ...

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.