A magnitude 4.3 earthquake hit near Muscoy, San Bernardino County at 9:32 a.m. with a depth of 3.3 miles. The epicenter was approximately 60 miles east of Los Angeles. A total of 7,054 people reported feeling the quake across a wide area including Santa Clarita and San Diego. Other smaller earthquakes also occurred in the region leading up to the main quake. Seismologist Susan Hough attributed these quakes to the intersection of the San Jacinto and San Andreas Faults, indicating that frequent seismic activity is normal in this area.
Susan Hough, a seismologist with USGS, reported that the quakes occurred in an area that experiences frequent earthquakes, where the San Jacinto Fault intersects with the San Andreas Fault.
Hough noted that Southern California has seen an increase in magnitude 4 earthquakes throughout 2024 and into 2025, describing it as similar to 'popcorn kernels popping off'.
Hough emphasized that while a 4.3 earthquake in the region is not unusual, it serves as a reminder that larger earthquakes could occur.
There is a 31% chance of at least one earthquake of magnitude 3 or higher following the Muscoy quake within the next day.
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