Geothermal activity occurs at Cerro Blanco, and manifests itself on the caldera floor through fumaroles, hot ground and reportedly hot springs and mud volcanoes. Fumaroles reach temperatures of while temperatures of have been reported for the hot ground. Past intense hydrothermal activity appears to have emplaced silicic material up to thick, and steam explosions took place within the caldera. Active fumaroles and clay cones formed by fumarolic activity are also found in the phreatic crater. The geothermal system appears to consist of an aquifer heated by a magma chamber from below, and has been prospected for possible geothermal power generation.