At 0740 on 25 November the Servicio Geologico Colombiano (SGC) reported that increased seismicity at Puracé had been detected for a few hours. The seismicity was characterized by tremor and long-period signals located beneath the crater at depths less than 1 km. The signals were accompanied by gas plumes that rose up to 1.6 km above the summit and drifted SW. A small amount of ash may have been present in the plumes. The Alert Level remained at Yellow (the second lowest level on a four-color scale).

Geological Summary. Puracé is an active andesitic volcano with a 600-m-diameter summit crater at the NW end of the Los Coconucos Volcanic Chain. This volcanic complex includes nine composite and five monogenetic volcanoes, extending from the Puracé crater more than 6 km SE to the summit of Pan de Azúcar stratovolcano. The dacitic massif which the complex is built on extends about 13 km NW-SE and 10 km NE-SW. Frequent small to moderate explosive eruptions reported since 1816 CE have modified the morphology of the summit crater, with the largest eruptions in 1849, 1869, and 1885.

Source: Servicio Geológico Colombiano (SGC)