ice piston

ALASKA VOLCANO OBSERVATORY GLOSSARY
Ice piston, used by AVO in the context of describing a feature at the summit of Mount Redoubt, refers to a crater-like feature made of ice, but with vertical walls. It is formed by a plug of ice dropping down vertically as ice at the base melts and the water flows away.

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

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