A magnitude 3.4 earthquake struck 4 km south-southwest of Redlands in San Bernardino County on the morning of April 28, 2026, at a depth of approximately 12 km, the U.S. Geological Survey confirmed. The quake hit at 6:14 a.m. local time, jolting residents across the Inland Empire who were already uneasy after a series of small tremors over the preceding weekend.
The quake was cataloged under event ID ci41235031 on the USGS event page. The agency marked the record as reviewed, meaning a seismologist examined the waveform data and confirmed the reading rather than relying solely on automated detection.
“We had a handful of events in the magnitude 2 range over the weekend in the same general area, and then this 3.4 on Monday morning,” said Dr. Lucy Jones, a seismologist and founder of the Dr. Lucy Jones Center for Science and Society, in an interview. “That is not unusual for this part of Southern California. The faults here are active, and clusters of small earthquakes happen regularly.”…