Colombia is dealing with the aftermath of a devastating earthquake that killed close to 240 people in the initial toll. The magnitude-7.4 quake struck western Colombia on 10 August 2026, with its epicentre near San José del Palmar in Chocó. Authorities and scientists warn that the situation remains unstable. Fabio Florindo, president of Italy’s Istituto Nazionale di Geofisica e Vulcanologia (INGV), says the seismic event is highly unusual for the region in both intensity and rarity.
Florindo notes that since 1950, only two earthquakes of similar or greater magnitude have been recorded within 250 kilometers of the current epicenter. The quake’s strength and rarity have led experts to classify it as anomalous. The United States Geological Survey (USGS) reported that the earthquake originated at a depth of around 100 kilometers; a catalogue-based analysis puts it at approximately 116 kilometers, about four kilometers from San José del Palmar. At this depth, seismic waves can travel farther and affect a wider area.
The cause is tied to the region’s complex tectonic dynamics. The Nazca Plate extends from the Pacific Ocean to the South American coast and reaches Easter Island. It is subducting beneath South America at an average rate of 8 centimeters per year. The process is uneven: periods of acceleration raise the risk of impressive energy release. Measured at 7.4 on the Richter scale, the recent quake reflects a sudden release of accumulated energy that produced extraordinary destructive power. Its depth and location fit an event within or near the subducting Nazca Plate. A regional comparison also identified four earthquakes of magnitude 7 or greater within roughly 1,100 kilometers of Bogotá in 2026, an exceptional concentration in the USGS catalogue record since 1900. The clustering alone does not show that the events were directly connected.
Initial data suggest that a major fault rupture occurred within the Nazca Plate during subduction. The fault is estimated to be at least 110 kilometers long. The rupture helps explain the scale of the disaster and raises concerns about further seismic activity. Florindo warns that aftershocks are almost certain, though their magnitude cannot be predicted. The basic event could also trigger additional faults and prolong instability for months, with intensity that may vary.
The earthquake affected Chocó, Valle del Cauca, Risaralda, Caldas and Quindío, including the major population centres of Cali and Pereira. Calculations based on USGS shaking and exposure data put the number of people affected at approximately 1.5 million. A 20 August tally attributed to Colombia’s National Unit for Disaster Risk Management (UNGRD) recorded 190 deaths in Valle del Cauca, 108 in Risaralda and 12 in Chocó. The figures show that fatalities were concentrated well beyond the epicentral municipality.
The official toll rose as rescue, identification and reporting continued. EFE reported 335 deaths, 4,516 injured and 103 missing on 21 October, describing the earthquake as Colombia’s strongest of the 21st century. Earlier updates cited by the UNGRD recorded 331 deaths and 4,519 injuries. Reported damage included more than 30,000 destroyed homes and approximately 137,000 damaged homes.
Despite the recent catastrophe in neighboring Venezuela, Florindo rules out a direct connection between the two events. He says there is no evidence linking the Colombian earthquake to those in Venezuela. The Nazca Plate’s vast size means powerful quakes can occur independently along South America’s western coast.
Colombia’s geological monitoring systems remain on high alert. The Colombian Geological Service continues to monitor the situation and share data with the USGS and other international partners. Florindo says these collaborations are impressive to understanding seismic risks in such a complex region.
The response has moved beyond immediate rescue and damage assessments. On 21 October, Colombia held its first nationwide emergency-response drill since the earthquake, involving 1,046 municipalities and testing preparedness among residents, schools, businesses and local authorities. In Bogotá, the exercise drew on lessons from the August disaster and covered earthquakes, floods, landslides and fires.
Humanitarian operations continued across the five affected departments more than two months after the quake. A 22 October Colombia WASH situation report recorded 29 humanitarian organizations working in 52 municipalities and approximately 166,000 assistance records through water, sanitation and hygiene activities.
Colombia sits on the Pacific Ring of Fire, one of the world’s most seismically active zones. The country’s western regions are particularly vulnerable because the Nazca Plate continues to subduct beneath South America. Major earthquakes are rare, but the potential for impressive damage remains high, especially in densely populated or poorly constructed areas. The recent event underscores the need for strong monitoring and preparedness, alongside international scientific cooperation to manage seismic risks.
