SCIENCE

Hundreds of Quakes Shake Brawley, Imperial County Swarm

PUBLISHED May 10, 2026, 1:38 AM ET

Read, Watch or Listen

Media Bias Meter

Sources: 6

Center 67%

Right 33%

Sources: 6

Brawley, Calif. — A seismic swarm struck Imperial County beginning Saturday, producing more than 130 to over 350 recorded earthquakes through Sunday, with initial USGS reports noting a 3.5 magnitude event at 4:14 p.m. and later maximums near magnitude 4.7 overnight; Caltech Seismological Laboratory and USGS recorded primarily shallow events around 5–10 miles depth. San Diego and Imperial County officials reported no major damage or injuries as of Sunday morning; Brawley issued statements and local crews responded to minor utility issues. The California Governor’s Office of Emergency Services and USGS are monitoring activity this week, and seismologists say continued small tremors are possible while agencies assess infrastructure and public safety through ongoing surveys.

By Ayesha A. | JQJO News

Timeline of Events

Regional tectonic setting: West Coast plate boundary produces frequent seismicity (geologic context).
Early Saturday: local networks and seismological labs record initial tremors near Brawley.
4:14 p.m. Saturday: USGS logs a 3.5 magnitude event near Brawley (first listed by some outlets).
Late Saturday into early Sunday: larger events reported, peak around magnitude 4.5–4.7, hundreds of small quakes recorded.
Sunday and following days: Officials report no major damage, state and federal agencies continue monitoring and assessing impacts.

News Intelligence

Living on the West Coast means dealing with frequent seismic activity. This recent swarm in Brawley is a reminder to always be prepared. Check your home for quake safety, and review your family's emergency plan.

Media Bias

Articles Published:: 6
Right Leaning:: 2
Left Leaning:: 0
Neutral:: 4

Who Benefited

Seismologists, monitoring agencies, and local contractors gained observational data and readiness capacity to study the Brawley swarm and refine short-term monitoring and response plans.

Who Impacted

Residents and local businesses in Imperial County experienced shaking, minor utility impacts and short-term disruptions despite no major structural damage reported by officials.

Media Bias

Articles Published:: 6
Right Leaning:: 2
Left Leaning:: 0
Neutral:: 4
Distribution:: Left 0%, Center 67%, Right 33%

Who Benefited

Seismologists, monitoring agencies, and local contractors gained observational data and readiness capacity to study the Brawley swarm and refine short-term monitoring and response plans.

Who Impacted

Residents and local businesses in Imperial County experienced shaking, minor utility impacts and short-term disruptions despite no major structural damage reported by officials.