A magnitude 7.4 quake struck Colombia, shaking more than 10 million people

A powerful earthquake tore through western Colombia on the morning of August 10, 2026, collapsing hospitals, schools, and homes and setting off one of the country’s deadliest disasters in decades. The magnitude 7.4 quake struck near the town of San Jose del Palmar in the Choco region shortly after 7:30 a.m. local time, jolting a densely populated corridor of the Andes and sending residents rushing into the streets.

National authorities declared a state of emergency as rescue crews dug through rubble in search of survivors. Officials reported that the shaking was felt by millions of people across the western half of the country and into neighboring nations, making it the strongest event to hit Colombia in years.

A deep quake inside a subducting slab

According to the U.S. Geological Survey, the earthquake originated about 5 kilometers from San Jose del Palmar at a depth of roughly 110 kilometers. That places it in the category of intermediate-depth earthquakes, which occur between about 70 and 300 kilometers down and represent deformation within a subducting slab of oceanic crust rather than slip along the shallow plate boundary.

The USGS attributed the rupture primarily to strike-slip faulting inside the descending Nazca plate, which is grinding beneath South America along one of the world’s most active subduction zones. Deep earthquakes of this kind can spread their energy across a wide area, which helps explain why shaking reached so far from the epicenter.

More than 10 million people felt the ground move

The reach of the tremor was enormous. Federal modeling estimated that roughly 10.5 million people experienced strong to very strong shaking, a band of intensity capable of cracking walls, toppling unreinforced masonry, and knocking people off their feet. The quake rattled the cities of Cali, Pereira, Quibdo, and Manizales, and the motion was reported as far away as Ecuador and Panama.

The Colombian Geological Service described the event as among the most powerful to strike the country in more than a century. Its intermediate depth likely spared the region an even worse outcome, since the seismic waves had to travel farther before reaching the surface than they would have from a shallow rupture directly beneath a city.

A rising toll and collapsed buildings

Casualty figures climbed through the day as rescuers reached hard-hit areas. Colombian officials reported at least 130 people killed and hundreds injured in the hours after the quake, and warned that the toll would rise as crews reached isolated communities, according to NPR. Later tallies from the scene pushed the number of dead considerably higher.

Among the most alarming reports were collapses at medical facilities. Rescuers described patients trapped beneath fallen sections of a hospital, including a pediatrics ward, as first responders worked to free people from the debris. Schools and other public buildings also gave way, compounding the emergency in a region where many older structures were not built to withstand shaking of this magnitude.

Aftershocks complicate the rescue

The main shock was followed by a sequence of aftershocks that hampered recovery efforts and kept frightened residents outdoors. Monitoring agencies logged dozens of them in the first hours, the largest measuring about magnitude 5.0, according to reporting compiled by Time. Each new jolt raised the risk that already-weakened buildings could come down on rescuers and survivors alike.

Colombia sits along the seismically restless western edge of South America, where the Nazca plate dives beneath the continent at a rate of several centimeters a year. That setting produces frequent quakes, but events of this size are comparatively rare, and the government’s emergency declaration cleared the way for national resources and aid to flow toward the disaster zone as the search for the missing continued.

Why intermediate-depth quakes behave differently

The 110-kilometer depth of the rupture placed it well below the shallow zone where most destructive earthquakes occur. Shallow quakes concentrate their shaking in a relatively small area directly above the fault, while deeper events distribute their energy over a much broader region. That trade-off explains the seemingly contradictory character of this disaster: the shaking was felt across an unusually wide swath of territory, yet the intensity at any single point was somewhat muted compared with a shallow quake of the same magnitude.

Deep earthquakes within a subducting slab also tend to produce fewer surface ruptures and, in many cases, a lower risk of tsunami than shallow offshore quakes. The heavy toll in this case owed less to the raw physics of the rupture than to the vulnerability of the buildings in its path, many of them older masonry structures poorly suited to withstand strong ground motion.

A test of Colombia’s disaster response

The scale of the destruction across multiple cities stretched emergency services thin, forcing search-and-rescue teams to prioritize collapsed hospitals, schools, and apartment blocks where survivors were most likely to be trapped. National disaster agencies coordinated with local responders to move medical supplies, heavy equipment, and personnel into the hardest-hit areas, while damaged roads and continuing aftershocks complicated every stage of the effort. For a country accustomed to seismic risk, the event became a stark measure of how well its building codes and emergency systems held up under one of the strongest shocks in its modern history.

This article was produced with the assistance of AI and reviewed by Morning Overview editors prior to publication.

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