Monte Roundtop
Roundtop
Stratovulcano · United States · 1871 m
- Tipo
- Stratovulcano
- Paese
- United States
- Regione
- Nord America / Aleutian Ridge Volcanic Arc
- Altitudine
- 1871 m
- Coordinate
- 54.800, -163.589
- Ultima eruzione
- -7600
- Contesto tettonico
- Subduction zone / Continental crust (> 25 km)
- Forma vulcanica
- Composite
- Roccia principale
- Rhyolite
Sintesi geologica
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.
Sintesi da Wikipedia
Riassunto in ingleseRoundtop 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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Storia delle eruzioni
Cronologia dettagliata
- 7600 a.C. (±500 anni)VEI 5Stima geologicaBCE 7600 – In corso
Link esterni
⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.