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

Multiple earthquakes rattled parts of San Bernardino and Riverside counties Thursday morning, according to the U.S.

A magnitude-4.3 earthquake struck San Bernardino Thursday morning, shaking parts of Southern California. No major damage or ...

The quake occurred at approximately 9:32 a.m. PT, according to the U.S. Geological Survey. Originally estimated at 4.4, the tremor was later downgraded to 4.3. Its epicenter was located roughly 3.7 ...

USGS reports five earthquakes on the morning of July 31 in the Rialto area, ranging from 2.5 to 4.3 in magnitude.