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Global Volcanism Program | Image GVP-10378

Fumarolic plumes are visible on the hydrothermally altered western wall of Santa Ana's inner summit crater, which contains an acidic lake.  A steep descent down the NE crater wall at the far right allows access to the lake for geochemical sampling; recent surveys measured pH values of around 1.  Sequences of bedded phreatomagmatic tephra layers more than 100 m thick are exposed in the background in the walls of the outer summit craters of Santa Ana volcano.   Photo by Paul Kimberly, 2002 (Smithsonian Institution).

Fumarolic plumes are visible on the hydrothermally altered western wall of Santa Ana's inner summit crater, which contains an acidic lake. A steep descent down the NE crater wall at the far right allows access to the lake for geochemical sampling; recent surveys measured pH values of around 1. Sequences of bedded phreatomagmatic tephra layers more than 100 m thick are exposed in the background in the walls of the outer summit craters of Santa Ana volcano.

Photo by Paul Kimberly, 2002 (Smithsonian Institution).


Santa Ana