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Country: | United States | |
| Subregion Name: | Aleutian Islands | ||
| Volcano Number: | 1101-38- | ||
| Volcano Type: | Stratovolcano | ||
| Volcano Status: | Radiocarbon | ||
| Last Known Eruption: | 7600 BC ± 500 years | ||
| Summit Elevation: | 1871 m | 6,138 feet | |
| Latitude: | 54.80°N | 54°48'0"N | |
| Longitude: | 163.589°W | 163°35'20"W | |
| 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. | |||
