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 magnitude 4 earthquake rattled Southern California before dawn Sunday morning — the strongest in a series of modest earthquakes to strike near the Ontario International Airport in the last month.

After another smaller quake, 3.9-magnitude earthquake strikes near Ontario 05:58. More than a dozen aftershocks followed a 3.9-magnitude earthquake that struck the Inland Empire Saturday — a ...

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 preliminary 4.0-magnitude earthquake struck near Ontario this morning, according to the U.S. Geological Survey. The quake hit at 3:51 a.m. Sunday with an epicenter of 2.8 miles northwest of Ontario.

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 ...

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 ...

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 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. They were the largest in a series ...

New research led by the University of Victoria (UVic) has illuminated a significant and previously unrecognized source of ...