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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)

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Typical eruption style: unspecified
Roundtop volcano eruptions: 7600 BC ± 500 years

Latest nearby earthquakes

TimeMag. / DepthDistance / 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.
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Smithsonian / GVP volcano information

Roundtop Volcano Photos

Latest satellite images

roundtop satellite image sat1roundtop satellite image sat2

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