Several features from the Augustine 1883 eruption can be seen in this 1987 photo of the N flank. The hill across the shallow lagoon to the lower right is a debris avalanche hummock produced by collapse of the summit and N flank in 1883. The result of the avalanche was a large open crater that is largely filled by 20th-century lava domes; the outer wall is in the shadow to the left. The area covered with sparse green vegetation is a pyroclastic flow deposit from the 1883 eruption.

Photo by Lee Siebert, 1987 (Smithsonian Institution).

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

Galleries: Debris Avalanches / Landslides | Stratovolcanoes | Lava Domes

Keywords: debris avalanche deposit | deposit | stratovolcano | lava dome | emissions | gas | gas plume | hummock

Augustine