The Rialto Fire Department reported that a series of small earthquakes shook the northwestern portion of the city Thursday morning.

A 4.3-magnitude earthquake shook parts of Southern California, the U.S. Geological Survey reported. The about 3-mile deep quake hit about 4 miles west from Muscoy in San Bernardino County at 9:32 a.m. Thursday, July 31, according to the USGS.

A preliminary 4.4-magnitude earthquake struck Southern California Thursday morning, according to the U.S. Geological Survey.