An outcrop in a quarry showing the internal structure of a debris avalanche hummock, with bedded layers of tephra on the right and a segment of a lava flow on the left. Both the massive lava and the unconsolidated tephra layers were transported relatively intact for about 30 km within a debris avalanche from Raung volcano in eastern Java. The preservation of original stratigraphy from within the volcano is a common feature of debris avalanche deposits.

Photo by Lee Siebert, 1995 (Smithsonian Institution).

This image is made available under the Public Domain Dedication CC0 license, but proper attribution is appreciated.

Galleries: Volcanic Outcrops | Debris Avalanches / Landslides

Keywords: debris avalanche deposit | deposit | hummock | outcrop

Raung