The walls of Cráter Activo expose thick sequences of oxidized and hydrothermally altered pyroclastic deposits and lighter lava flows. Many eruptions from Active Crater have originated from vents beneath the acidic crater lake.

Photo by Guillermo Alvarado (Instituto Costarricense de Electricidad).

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

Keywords: crater | crater lake | stratigraphy | gas | gas plume | emissions | degassing | hydrothermal alteration

Rincón de la Vieja