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Roundtop volcano

Stratovolcano 1871 m / 6,138 ft
United States, Aleutian Islands, 54.8°N / -163.59°W
Current status: normal or dormant (1 out of 5) | Reports
Roundtop volcano books
Typical eruption style: unspecified
Roundtop volcano eruptions: 7600 BC ± 500 years
TimeMag. / DepthDistanceLocation
Thu, 18 Oct
Thu, 18 Oct 18:23 UTCM 2.9 / 111.1 km11 km- 3km SE of False Pass, Alaska
Sat, 6 Oct
Sat, 6 Oct 04:51 UTCM 1.9 / 13.4 km39 km- 33km SE of False Pass, Alaska

Background:

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.
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Smithsonian / GVP volcano information

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