A magnitude 4.3 earthquake shook Muscoy in San Bernardino County on Thursday morning, affecting residents across the Inland Empire and beyond. The quake struck at 9:32 a.m., with a depth of about 3.3 miles, and was followed by a magnitude 3.1 tremor just minutes later. This seismic activity is a reminder of California’s ongoing geological dynamism, especially notable since 2025-07-31 20:38:00.
- Magnitude 4.3 earthquake hit Muscoy, CA.
- Followed by a magnitude 3.1 quake.
- No immediate reports of damage.
- Felt across Southern California regions.
- Earthquake swarm in Fontana Trend area.
- Average of 25 quakes yearly in California.
While there were no immediate reports of damage, the Rialto Fire Department noted a series of smaller earthquakes leading up to the main event. Residents reported light shaking, but the intensity was insufficient to cause harm.
This recent earthquake raises questions about the frequency of seismic events in California. Are we prepared for larger quakes? Seismologist Lucy Jones highlighted the Fontana trend, a region known for small earthquake swarms. Key points include:
- 130 magnitude 3.0 earthquakes since 1990 in the Fontana Trend.
- Three earthquakes of magnitude 3.0 or greater occurred in the past 10 days.
- California averages 25 quakes between magnitudes 4.0 and 5.0 annually.
As we reflect on this event, it’s crucial to stay informed and prepared. Consider signing up for emergency preparedness resources to ensure you and your loved ones are ready for any future tremors.
