Report on Purace (Colombia) — 30 March-5 April 2022
Smithsonian / US Geological Survey Weekly Volcanic Activity Report,
30 March-5 April 2022
Managing Editor: Sally Kuhn Sennert
Please cite this report as:
Global Volcanism Program, 2022. Report on Purace (Colombia). In: Sennert, S K (ed.), Weekly Volcanic Activity Report, 30 March-5 April 2022. Smithsonian Institution and US Geological Survey.
2.32°N, 76.4°W; summit elev. 4650 m
All times are local (unless otherwise noted)
The Popayán Observatory, part of the Servicio Geologico Colombiano (SGC) reported that there was an increase in the number of volcano-tectonic earthquakes associated with rock fractures at Puracé. On 28 March, 479 volcanic tremors, 183 long-period (LP), and 119 volcanic tremor (TR) events were detected. Seismicity was detected 800 m SE from the crater at average depths of 2 km. An earthquake that occurred at 1214 on 29 March had a magnitude of 3.3. That same day, two cracks approximately 40 m long produced gas-and-steam emissions. On 30 March the Volcano Alert Level rose to 3 or Yellow (the second lowest on a four-color scale).
Geological Summary. Puracé in Colombia consists of an andesitic stratovolcano with a 500-m-wide summit crater constructed over a dacitic shield volcano. It lies at the NW end of a volcanic massif opposite Pan de Azúcar stratovolcano, 6 km SE. A NW-SE-trending group of seven cones and craters, Los Coconucos, lies between the two larger edifices. Frequent explosive eruptions in the 19th and 20th centuries have modified the morphology of the summit crater. The largest eruptions occurred in 1849, 1869, and 1885.