Mount Roundtop
Roundtop
Stratovolcano · United States · 1871m
- Type
- Stratovolcano
- Country
- United States
- Region
- North America Volcanic Regions / Aleutian Ridge Volcanic Arc
- Elevation
- 1871m
- Coordinates
- 54.800, -163.589
- Last eruption
- -7600
- Tectonic setting
- Subduction zone / Continental crust (> 25 km)
- Landform
- Composite
- Major rock type
- Rhyolite
Geological summary
The flat-topped, glacier-covered Roundtop is the easternmost and lowest of an E-W-trending line of volcanoes on eastern Unimak Island, 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 the volcano. No historical eruptions are known, but in the 1930's warm springs were found on its slopes.
From Wikipedia
Roundtop Mountain is a stratovolcano located on the Aleutian island of Unimak in the U.S. state of Alaska. Its last eruption was sometime between 9,100 and 10,000 years ago. This geographic feature was first called "Dome" in 1897 by Lieutenant Commander J. F. Moser, of the U.S. Navy. Its name was reported as "Round Top" by the United States Coast and Geodetic Survey in 1902. Isanotski Peaks, the nearest higher neighbor, is positioned 5.9 mi (9 km) to the west-southwest.
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Eruption history
Detailed timeline
- 7600 BCE (±500 yrs)VEI 5Geological estimateBCE 7600 – Ongoing
External links
⚠ For reference only. Not for emergency response.