Volcano Photos

Veniaminof volcano, United States

Veniaminof volcano, United States, Volcano photo

Veniaminof volcano, United States

A steaming cinder cone on the western floor of the summit caldera of Veniaminof volcano was the source of the dark lava flow that melted through the glacial icecap.

This photo was taken from the SE on June 15, 1984, two months after the eruption ended, and shows the rim of the 8 x 11 km wide caldera in the background.

The caldera rim is breached by Cone Glacier on the west side (at the extreme left) and is completely overtopped by glaciers on the south and SE sides. Veniaminof is one of the most voluminous and most active volcanoes on the Alaska Peninsula.

Massive Veniaminof volcano, one of the highest and largest volcanoes on the Alaska Peninsula, is truncated by a steep-walled, 8 x 11 km, glacier-filled caldera that formed around 3700 years ago.

The caldera rim is up to 520 m high on the north, is deeply notched on the west by Cone Glacier, and is covered by an ice sheet on the south. Post-caldera vents are located along a NW-SE zone bisecting the caldera that extends 55 km from near the Bering Sea coast, across the caldera, and down the Pacific flank.

Historical eruptions probably all originated from the westernmost and most prominent of two intra-caldera cones, which reaches an elevation of 2156 m and rises about 300 m above the surrounding icefield.

The other cone is larger, and has a summit crater or caldera that may reach 2.5 km in diameter, but is more subdued and barely rises above the glacier surface.

PHOTO SOURCE: Photo by Alaska Volcano Observatory, U.S. Geological Survey, 1984.

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