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Global Volcanism Program | Image GVP-11560

Hydrothermally altered rocks and lava flows are exposed in cliffs on the Irazú upper northern flank. Las Fumaroles (near top center), a thermal area below the cliffs, was the source of an explosive eruption in December 1994 that also produced an avalanche and lahar down the Río Sucio. Photo by Eliecer Duarte, 2001 (OVSICORI-UNA).

Hydrothermally altered rocks and lava flows are exposed in cliffs on the Irazú upper northern flank. Las Fumaroles (near top center), a thermal area below the cliffs, was the source of an explosive eruption in December 1994 that also produced an avalanche and lahar down the Río Sucio.

Photo by Eliecer Duarte, 2001 (OVSICORI-UNA).

Keywords: hydrothermal alteration | crater | exposure stratigraphy


Irazú