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,

An earthquake with a preliminary magnitude of 3.5 struck the Inland Empire on Saturday ... Thousands of earthquakes are recorded in California yearly, but the vast majority are extremely minor. Several hundred reach a magnitude of 3.0, and only about ...

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.