With an epicentre near BHP's Mount Arthur mine site, it is the fourth earthquake above a magnitude of 4 to hit the region in recent months.

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.

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.

The first magnitude 3.5 earthquake happened at around 2:17 p.m. about 4.5 miles northwest of Fontana and about a mile and a half deep into the ground, the USGS said. Six hours later, a 3.4 quake occurred at around 8:17 p.

Two 3.0+ earthquakes were reported in the Inland Empire on Saturday near Fontana, according to the U.S. Geological Survey. The first magnitude 3.5 earthquake happened at around 2:17 p.m. about 4.5 miles northwest of Fontana and about a mile and a half deep into the ground,

A preliminary 3.5-magnitude earthquake rattled Fontana Saturday afternoon, according to the United States Geological Survey.