An earthquake with a magnitude of 4.3 struck Istmina, Chocó, on Sunday, September 27, at 4:57 p.m. local time, according to data from El Servicio Geológico Colombiano (SGC). The seismic event registered at a depth of 43 kilometers, prompting social media reports from residents who felt the ground move across several regions.
Recent Seismic Activity in Chocó and Tolima
Users on the social media network X reported feeling the 4.3 magnitude tremor in Pereira and across multiple municipalities in Valle del Cauca, including La Unión, Yumbo, and Roldanillo. This event followed a separate series of tremors centered in the municipality of Chaparral, Tolima, occurring between Saturday and Sunday. SGC records show four earthquakes struck Chaparral during the weekend mornings and nights, including a 3.2 magnitude tremor at 11:39 a.m. on Sunday.
https://x.com/sgcol/status/2104332552634765643
Saturday’s activity in Tolima included four additional shallow earthquakes. The SGC documented a 3.4 magnitude tremor at 12:48 p.m., a 3.1 magnitude tremor at 12:23 p.m., and a 3.2 magnitude event at 10:10 a.m. Each of these Saturday shocks registered at a shallow depth in the region.
Did You Know? The SGC designated the Chocó event with the official designation “Evento sísmico – Boletín Actualizado 1, 2026-09-27, 16:57 hora local, magnitud 4.3, profundidad 43 km, Istmina – Chocó, Colombia.”
Tectonic Forces Driving Colombia’s Seismic Activity
Colombia experiences constant seismic activity due to its natural geological setting, though the majority of these tremors go unnoticed by the public. The SGC attributes this frequency to the country’s position along the Cinturón de Fuego del Pacífico, a major zone ringing the Pacific Ocean that concentrates a vast share of global seismic and volcanic events. The interaction among the Nazca, Cocos, South America, and Caribbean tectonic plates drives this active environment. These massive surface blocks shift continuously, producing ground movements across different parts of the country.
Magnitude, reported locations, and tectonic causes of the Istmina earthquake
What was the magnitude and depth of the earthquake in Istmina?
The earthquake registered a magnitude of 4.3 with a depth of 43 kilometers.
https://x.com/Rodrigo_Lara_/status/2104241066173968605
Where was the earthquake felt according to public reports?
Users on the network X reported feeling the movement in Pereira and Valle del Cauca municipalities such as La Unión, Yumbo, and Roldanillo.
Why does Colombia experience frequent earthquakes?
The SGC explains that Colombia sits within the Cinturón de Fuego del Pacífico and features complex interactions among the Nazca, Cocos, South America, and Caribe tectonic plates.