Roundtop Volcano
Updated: Mar 28, 2024 09:33 GMT -
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)
United States, Aleutian Islands, 54.8°N / -163.59°W
Current status: normal or dormant (1 out of 5)
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Roundtop volcano eruptions: 7600 BC ± 500 years
Latest nearby earthquakes
Time | Mag. / Depth | Distance / Location | |||
Mar 24, 05:23 pm (Anchorage) Mar 25, 01:23 GMT | 1.3 2.9 km | 12 km (7.7 mi) to the S | United States, 56 mi southwest of King Cove, Aleutians East, Alaska | Info | |
Tuesday, March 19, 2024 GMT (1 quake) | |||||
Mar 18, 10:05 pm (Anchorage) Mar 19, 06:05 GMT | 2.0 7.9 km | 24 km (15 mi) to the S | 29 km SSW of False Pass, Alaska | Info | |
Monday, March 18, 2024 GMT (1 quake) | |||||
Mar 18, 12:30 am (Anchorage) Mar 18, 08:30 GMT | 1.5 2.8 km | 25 km (16 mi) to the S | 29 km S of False Pass, Alaska | Info |
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.---
Smithsonian / GVP volcano information
Roundtop Volcano Photos
The chain of volcanoes on Unimak, from left to right: Roundtop Mountain, Isanotski, Pogromni and Shishaldin. (Photo: marcofulle)