A 4.1-magnitude earthquake struck near Corona in Riverside County on Thursday afternoon, according to the U.S. Geological Survey (USGS). The quake, originally reported as a 4.5 but later downgraded, occurred at 1:49 p.m. about 5.3 miles from Corona.

The earthquake, though brief, was felt by residents across the region, with reports of shaking from both Riverside and Orange Counties. One resident in Santa Ana described experiencing a strong jolt.

In response to the tremor, the Los Angeles Fire Department briefly entered “earthquake mode,” where firefighters across all 106 stations inspected their areas for any potential damage or hazards. Fortunately, no significant structural damage or injuries were reported in the immediate aftermath.

The Orange County Fire Authority also confirmed that no quake-related incidents had been reported.

Seismologist Dr. Lucy Jones indicated that Thursday’s earthquake was part of a “sequence” of smaller quakes that had already been occurring in the area. On Tuesday, the region experienced multiple tremors, including magnitudes of 2.8 and 2.5. Dr. Jones explained, “When one earthquake happens, another one is more likely. Mostly, they stay small, but there’s a 5% chance this could be followed by a larger event in the next couple of days.”

While Southern California is no stranger to seismic activity, the region continues to remind residents of the importance of earthquake preparedness.

For more information on how to stay safe during earthquakes, visit Prepare SoCal for disaster readiness resources.