The southern side of Siete Orejas volcano is cut by a large breached caldera drained by the Ocosito river. The caldera, seen here from the SW, is 3.5 km wide and more than 10 km long, and its walls tower about 1000 m above the caldera floor. The origin of the caldera is uncertain, but may involve one or more processes including collapse following a major explosive eruption, collapse by slope failure, and excavation by headward stream erosion.

Photo by Bill Rose, 1980 (Michigan Technological University).

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

Siete Orejas