3.3-magnitude quake rattles Redlands area in San Bernardino County

A 3.3-magnitude earthquake struck the Redlands area of San Bernardino County around 7:45 a.m. Monday, according to the U.S. Geological Survey, with no immediate reports of injuries or damage.

The shallow tremor, centered roughly 50 miles east of Orange County, is the latest in a pattern of small-to-moderate seismic events that periodically shake inland Southern California's network of active fault systems.

The U.S. Geological Survey placed the epicenter in the Redlands area and logged the event at a depth of just over 2 miles. USGS initially recorded the magnitude at 3.4 before revising it down to 3.3.

The shallow depth — less than 5 miles — can amplify the intensity of shaking felt at the surface compared with deeper events of equivalent magnitude.

No injuries or property damage were immediately reported in the surrounding area following the shaking, according to USGS data.

San Bernardino County, home to several branches of the San Andreas Fault system, experiences frequent seismic activity across a wide magnitude range. Residents in the eastern portions of Orange County may occasionally feel tremors originating from the Redlands area, which lies within the broader Inland Empire seismic zone.

Redlands lies approximately 50 miles east of the Orange County border. The USGS monitors seismic activity across Southern California in real time through its earthquake hazards program.