Several features of 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 horseshoe-shaped 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.

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

Augustine