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Global Volcanism Program | Image GVP-02675

These islands and peninsulas on the north coast of Augustine formed in 1883 when collapse of the summit produced a large debris avalanche. The highly mobile avalanche traveled half of its 8-km runout beyond the pre-1883 shoreline and extended the shoreline of the island up to 2 km. Pyroclastic flows from that eruption also reached the new coastline and formed the light-colored deposits to the lower left. Photo by Lee Siebert (Smithsonian Institution).

These islands and peninsulas on the north coast of Augustine formed in 1883 when collapse of the summit produced a large debris avalanche. The highly mobile avalanche traveled half of its 8-km runout beyond the pre-1883 shoreline and extended the shoreline of the island up to 2 km. Pyroclastic flows from that eruption also reached the new coastline and formed the light-colored deposits to the lower left.

Photo by Lee Siebert (Smithsonian Institution).

Keywords: debris avalanche | deposit | debris avalanche deposit


Augustine