Brawley, CA – A series of earthquakes shook the Imperial Valley overnight into Saturday, with multiple moderate tremors reported near Brawley, a small city close to the U.S.-Mexico border.
According to the U.S. Geological Survey (USGS), the strongest quake reached magnitude 4.5 at 8:39 p.m. Friday (May 9), located about 2 kilometers west-northwest of Brawley at a depth of roughly 16 kilometers. Several additional quakes followed through the early morning hours Saturday, including magnitudes 4.4, 4.2, and 4.0 in nearly the same area.
The cluster—often referred to as an earthquake swarm—also included dozens of smaller tremors ranging from magnitude 2.5 to 3.5. Most were centered within a few kilometers of Brawley in Imperial County, part of a highly active seismic zone near the southern San Andreas Fault system and the Salton Trough.
Residents across Brawley, El Centro, and nearby communities, as well as Mexicali, Mexico, reported light to moderate shaking. Initial intensity reports ranged from weak to moderate levels, with no immediate reports of significant damage or injuries.
Seismologists note that earthquake swarms are not uncommon in this region, which experiences frequent seismic movement due to complex fault interactions. While most events remain minor, officials continue monitoring for any increase in magnitude or frequency.
The USGS estimates a low likelihood of a significantly larger quake following this sequence, though aftershocks are expected to continue over the coming days.
Residents are encouraged to remain prepared, secure loose items, and review earthquake safety plans as seismic activity persists in the area.
