Planchón-Peteroa is a complex volcano with several overlapping calderas. Activity began during the Pleistocene with construction of Volcán Azufre, followed by formation of Volcán Planchón, 6 km to the north. The youngest volcano, Volcán Peteroa, consisting of scattered vents between Azufre and Planchón, has been active into historical time and contains a small steaming crater lake. Historical eruptions have been dominantly explosive, although lava flows were erupted in 1837 and 1937.

Photo by Hugo Moreno (University of Chile).

This image is made available under the Creative Commons BY-NC 4.0 license terms.

Planchón-Peteroa