Roundtop Volcano
Updated: Apr 27, 2024 12:19 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 | |||
| Apr 19, 01:55 am (Anchorage) | 0.8 8 km |  36 km WSW of False Pass, Alaska | Info | ||
| Apr 18, 11:22 pm (Anchorage) | 1.9 11 km | 29 km (18 mi) to the S | 35 km S of False Pass, Alaska | Info | |
| Wednesday, April 17, 2024 GMT (1 quake) | |||||
| Apr 16, 11:24 pm (Anchorage) | 1.8 12 km | 29 km (18 mi) to the S | 35 km S of False Pass, Alaska | Info | |
| Sunday, April 14, 2024 GMT (2 quakes) | |||||
| Apr 14, 03:42 pm (Anchorage) | 0.3 13 km | 40 km W of False Pass, Alaska | Info | ||
| Apr 14, 09:42 am (Anchorage) | 0.4 12 km | 33 km WSW of False Pass, Alaska | Info | ||
| Saturday, April 13, 2024 GMT (1 quake) | |||||
| Apr 13, 07:42 am (Anchorage) | 1.9 13 km | 28 km (17 mi) to the S | 35 km SSW 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)
Latest satellite images
