A magnitude 4.3 earthquake struck near Muscoy, California, on Thursday morning, shaking a wide area of Southern California. The quake occurred at 9:32 a.m. at a depth of approximately 3.3 miles, according to the U.S. Geological Survey (USGS). It was followed by a magnitude 3.1 aftershock just four minutes later in Rialto.

Residents across several counties, including San Bernardino, Los Angeles, and Orange, reported feeling the tremors. The shaking was felt as far away as San Diego and Ventura County. Many individuals described the sensation as a sudden jolt or rolling movement.

Chris Jensen, the interim fire chief in Rialto, stated, "No significant damage has been reported, but it is still early to assess the situation." He noted that there have been no medical calls related to the earthquake, but the department will continue to monitor the area.

In the hours leading up to the larger quake, two smaller earthquakes of magnitudes 3.0 and 2.8 were recorded in Rialto. The USGS reported that the initial quake was part of a series of seismic activity in the region, which has experienced about 130 earthquakes of magnitude 3.0 or greater since 1990.

The intensity of the shaking was reported to be level 4 on the Modified Mercalli Intensity Scale near the epicenter, indicating a light shaking that is unlikely to cause damage. Areas farther from the epicenter, such as Simi Valley and Redondo Beach, reported weaker shaking, rated between levels 2 and 3.

This earthquake comes shortly after a powerful magnitude 8.8 quake struck off the coast of Russia, prompting tsunami warnings and evacuations along the U.S. West Coast. Residents are encouraged to report their experiences to the USGS and to prepare for future seismic events.