Overview
- The swarm, which began Saturday near Brawley in Imperial County, has slowed by late Sunday after more than 350 recorded earthquakes.
- The strongest quake measured magnitude 4.7 just after midnight Sunday, and light shaking was felt from the Coachella Valley to Calexico, Mexicali, and San Diego.
- City officials reported no major damage or injuries, and crews fixed minor water leaks and utility issues as they advised residents to prepare for aftershocks.
- Most quakes were shallow at roughly 5 to 10 miles deep, which makes shaking feel stronger at the surface, and the USGS sent ShakeAlert warnings.
- Experts note the cluster sits within the Brawley Seismic Zone between the Imperial and San Andreas faults, where swarms occur from time to time without signaling a larger event.