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Global Volcanism Program | Image GVP-02677

In the foreground is a hummock of a debris avalanche deposit produced by collapse of the Augustine summit about 450 years ago. The avalanche swept into Kamishak Bay and traveled a distance of 11 km from the summit, forming the 2 x 3 km wide West Island. The fine-grained component of this avalanche hummock has been removed by the powerful Cook Inlet tides. The eruption was accompanied by a small lateral blast. Photo by Lee Siebert, 1987 (Smithsonian Institution).

In the foreground is a hummock of a debris avalanche deposit produced by collapse of the Augustine summit about 450 years ago. The avalanche swept into Kamishak Bay and traveled a distance of 11 km from the summit, forming the 2 x 3 km wide West Island. The fine-grained component of this avalanche hummock has been removed by the powerful Cook Inlet tides. The eruption was accompanied by a small lateral blast.

Photo by Lee Siebert, 1987 (Smithsonian Institution).

Creative Commons Icon 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