Global Volcanism Program | Image GVP-01149
This hilly terrain is part of a massive debris-avalanche deposit that formed as a result of collapse of Gunung Gadung on the west side of Raung volcano. The debris-avalanche deposit has an estimated volume of about 25 km3. The avalanche banked against the slopes of Iyang-Argapura volcano and was deflected to the SW, traveling nearly to the Indian Ocean.
Photo by Lee Siebert, 1995 (Smithsonian Institution).