The two earthquakes, which occurred at magnitudes of 3.5 and 3.4, were separated by six hours and centered just miles outside of Fontana, according to the USGS.

An earthquake with a preliminary magnitude of 3.4 struck the Inland Empire around 8:17 p.m., the second time an earthquake hit the region on Saturday. According to the United States Geological Survey,

A magnitude 3.4 earthquake hit the Fontana area Saturday, the U.S. Geological Survey said. The Inland Empire quake was centered just under five miles northwest of Fontana, the agency said. It happened at a depth of roughly 2½ miles at 8:17 p.