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Global Volcanism Program | Image GVP-00609

The hydrothermally altered rocks of Welirang Ridge in the background is the NE scarp resulting from the partial flank collapse of Papandayan volcano in 1772. The extensive alteration of rocks within the volcano contributed to the collapse that produced a debris avalanche that traveled 11 km from the volcano, destroying 40 villages. Photo by Tom Casadevall, 1986 (U.S. Geological Survey).

The hydrothermally altered rocks of Welirang Ridge in the background is the NE scarp resulting from the partial flank collapse of Papandayan volcano in 1772. The extensive alteration of rocks within the volcano contributed to the collapse that produced a debris avalanche that traveled 11 km from the volcano, destroying 40 villages.

Photo by Tom Casadevall, 1986 (U.S. Geological Survey).

Keywords: hydrothermal alteration | outcrop | exposure | stratigraphy


Papandayan