The Servicio Geologico Colombiano (SGC) reported that a M 1.7 earthquake indicating rock fracturing occurred at 1700 on 1 February and was located 2 km below the Puracé cone. On 2 February there was an increase in tremor and long-period events with signals located less than 2 km beneath the cone. Deformation data did not show any significant movement and gas emissions were unchanged. 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)