1.9 million people are estimated to have felt very strong shaking, 14 million strong, 12.9 million moderate, and 5.6 million light.
Based on all available data, there is no tsunami threat from this earthquake because it is located too deep inside the Earth, NWS PTWC said at 12:55 UTC. No action is required.
The USGS issued an Orange alert for shaking-related fatalities and economic losses. Significant casualties and damage are likely and the disaster is potentially widespread. Past orange alerts have required a regional or national level response.
Estimated economic losses are less than 1% of GDP of Colombia.
Strong 7.4 Earthquake strikes western Colombia
Less than seven weeks after Venezuela’s catastrophic earthquake sequence, Latin America has been struck again. A magnitude 7.4 earthquake hit western Colombia on Monday, August 10, 2026, causing structural damage across multiple cities and triggering evacuations as far away as Bogotá, Ecuador, and Panama.
The earthquake struck at approximately 9:41 a.m. local time, with its epicenter located near San José del Palmar — a small municipality of roughly 4,800 people in Colombia’s Chocó department, about 400 kilometers west of Bogotá. The USGS recorded a depth of approximately 107 kilometers, while Colombia’s own Geological Survey (SGC) placed the depth at 96 kilometers. Both agencies agreed on the M7.4 magnitude, though the SGC’s preliminary reading came in at 6.6 before being reconciled with USGS data.
The relatively deep focal depth — more than 100 kilometers below the surface — is a significant engineering factor. At that depth, seismic energy disperses more gradually as it travels upward, which reduces peak ground acceleration at the surface compared to a shallow rupture. The June 24 Venezuela doublet, by contrast, struck at just 10 kilometers depth, which is why the surface shaking there was so severe. In the Colombia event, the depth likely prevented an even worse outcome — but at M7.4, the energy released was still more than sufficient to cause serious structural damage across a wide area.
The shaking was felt across a broad swath of western and central Colombia, including Bogotá, Cali, Medellín, Pereira, Manizales, Armenia, Popayán, and Quibdó. It also reached neighboring Ecuador — where it interrupted the national holiday commemorating the First Cry of Independence — as well as Panama, where light shaking was reported in Panama City and Darién province with no structural damage confirmed there.
The hardest-hit area near the epicenter was Quibdó, the capital of Chocó with a population of approximately 130,000. Governor Nubia Córdoba confirmed injuries and serious building damage in the city. Footage circulating on local media showed partial and full collapses of homes and smaller structures in Pereira, Cali, and Quibdó. The mayor of Cali — Colombia’s third-largest city — also reported significant structural damage. In Bogotá, Mayor Carlos Fernando Galán confirmed that some buildings sustained cracking but reported no catastrophic collapses in the capital. Precautionary evacuations were carried out at major hospitals in Quito, Ecuador. As of this writing, no official death toll has been confirmed by national authorities.
The immediate priority is search and rescue in the areas closest to the epicenter, particularly in Chocó where structural collapses have been confirmed. Rapid damage assessment in Pereira, Cali, and Quibdó will be essential in the coming 24–72 hours to identify buildings requiring immediate evacuation or stabilization, and to distinguish collapsed structures from those that are damaged but still repairable.
Aftershock hazard will remain elevated. Following a M7.4 mainshock, the probability of a M6.0 or larger aftershock in the following week is significant, and weakened structures that survived the mainshock face elevated collapse risk in follow-on events.
The pattern across this region — Venezuela in June, Colombia today — underscores a consistent and urgent message: seismic resilience is not a theoretical future concern. It is an active, present-day priority for millions of people living along the Andean convergence zone, and the cost of deferred mitigation is measured in lives.
No comments:
Post a Comment