A 3.9-magnitude earthquake occurred near Ontario on Saturday morning, approximately 30 minutes following a smaller quake in the area, as reported by the U.S. Geological Survey.
The initial tremor was recorded just three miles southwest of Ontario in San Bernardino County at 10:05 a.m. The subsequent earthquake, measuring 3.9 in magnitude, struck at 10:34 a.m. Within an hour, at 11:20 a.m., there were already a dozen aftershocks, ranging from magnitudes of 2.1 to 1.0, all within a four-mile radius of Ontario.
Seismologists noted that this year has been the most seismically active since 1988, following numerous earthquakes in Southern California. In June and August, Los Angeles County near Pasadena experienced quakes measuring 3.5 and 4.4 in magnitude, respectively. Earlier in August, a 5.5-magnitude quake centered at the southern end of Central California was felt across a vast area, shaking parts of Los Angeles and Ventura counties.
That significant tremor prompted over 400 aftershocks, including minor quakes of less than 1 in magnitude, within the two days that followed. It also saw two aftershocks exceeding magnitude 4 within an hour of the initial quake, highlighting a notably active seismic period, as noted by seismologist Dr. Lucy Jones at the time.
Stay tuned for further updates on this developing story.