Mount Roundtop
Roundtop
Estratovolcán · United States · 1871 m
- Tipo
- Estratovolcán
- País
- United States
- Región
- North America Volcanic Regions / Aleutian Ridge Volcanic Arc
- Altitud
- 1871 m
- Coordenadas
- 54.800, -163.589
- Última erupción
- -7600
- Contexto tectónico
- Subduction zone / Continental crust (> 25 km)
- Forma volcánica
- Composite
- Roca principal
- Rhyolite
Resumen geológico
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.
Resumen de Wikipedia
Resumen en inglésRoundtop 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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Historial de erupciones
Línea de tiempo detallada
- 7600 a. C. (±500 años)VEI 5Estimación geológicaBCE 7600 – En curso
Enlaces externos
⚠ Solo como referencia. No apto para respuesta ante emergencias.