A swarm of earthquakes, including one with a magnitude of 4.3, shook San Bernardino County on Thursday morning. According to the U.S. Geological Survey, the quake struck at 9:32 a.m. The

The earthquake followed a pair of smaller earthquakes in the Inland Empire. At 8:34 a.m., a 3.0 magnitude earthquake hit about 3 miles northwest of Rialto, and at 8:42 a.m., a 2.8 magnitude earthquake also hit about 3 miles northwest of Rialto.