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Roundtop volcano United States

Roundtop volcano United States, Costa Rica, Volcano photo


Roundtop volcano, United States

The flat-topped, glacier-covered Roundtop volcano, rising to the west beyond buildings of the village of False Pass, is the easternmost and lowest of an E-W-trending line of volcanoes on Unimak Island.

Roundtop has produced Holocene pyroclastic flows, and a group of lava domes was constructed south of the volcano. No historical eruptions are known from the 1871-m-high stratovolcano.

In the 1930s warm springs were found on its slopes.

The flat-topped, glacier-covered Roundtop volcano is the easternmost and lowest of an E-W-trending line of volcanoes on eastern Unimak Island.

Roundtop lies 13 km SW of the village of False Pass.

The snow and ice-covered edifice fills much of a 3-km-wide caldera that formed during the early Holocene.

The caldera-forming eruption produced pyroclastic flows and a rhyolitic tephra layer that is widespread throughout the southwestern end of the Alaska Peninsula.

A group of lava domes was constructed south of Roundtop volcano.

No historical eruptions are known from the 1871-m-high stratovolcano. In the 1930s warm springs were found on its slopes.

PHOTO SOURCE:Photo by Game McGimsey, 1998 (Alaska Volcano Observatory, U.S. Geological Survey).



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