A scientist from the Volcanological Survey of Indonesia examines a debris avalanche deposit at Papandayan volcano that predates the historic 1772 debris avalanche. The deposit contains large angular clasts in a hydrothermally altered matrix and the large log to the left.

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

This image is made available as a Public Domain Work, but proper attribution is appreciated.

Keywords: debris avalanche deposit | outcrop | geology | hydrothermal alteration

Papandayan