Stati Uniti · Stratovulcano
Monte Vsevidof
Vsevidof
- Tipo
- Stratovulcano
- Altitudine
- 2160 m
- Ultima eruzione
- 1878
- Tipo
- Stratovulcano
- Paese
- Stati Uniti
- Regione
- Nord America / Aleutian Ridge Volcanic Arc
- Altitudine
- 2160 m
- Coordinate
- 53.126, -168.688
- Ultima eruzione
- 1878
- Contesto tettonico
- Zona di subduzione / Crosta intermedia (15-25 km)
- Forma vulcanica
- Composito
- Roccia principale
- Andesite / Andesite basaltica
Sintesi geologica
The symmetrical Vsevidof stratovolcano, near the SW end of Umnak Island, contains a 1.2-km-wide, ice-filled summit crater that is breached by glaciers on the E and N sides. An E-W-trending zone of scoria cones that extends down much of the W flank has been the source of recorded eruptions. Most of the cone was constructed during the Holocene. Andesitic and dacitic lava flows originated from vents on the N and S flanks, and on the W-flank rift. The largest lava flow traveled down the W flank to the coast, forming Cape Kigushimkada.
Sintesi da Wikipedia
Riassunto in ingleseMount Vsevidof is a stratovolcano in the U.S. state of Alaska. Its summit is the highest point on Umnak Island, one of the eastern Aleutian Islands. Its symmetrical cone rises abruptly from its surroundings. The base of the volcano is around 10 km (6 mi) wide, steepening from about 15 degrees at 300 m (980 ft) altitude to around 30 degrees near the summit. Some glacial tongues have cut through narrow canyons up to 120 m (390 ft) deep, due to ice filling the crater and extending down the north and east flanks of the cone. It is most likely that Mount Vsevidof has not erupted in historic time. Reports of its latest eruption in 1957 is considered questionable by the Alaska Volcano Observatory. This also includes possible eruptions or activity which may have occurred at the volcano in 1784, 1790, 1830, 1878, and 1880.
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Storia delle eruzioni
7 registrateGlossarioCronologia dettagliata
- 1957VEI 2Metodo non indicato1957-03-11 – 1957-03-12West flank fissure
- 1880VEI ?Metodo non indicato1880-07-02 – fine sconosciuta
- 1878VEI 2Osservata1878-07-02 – fine sconosciutaWest flank fissure ?
- 1830VEI ?Osservata1830-07-02 – fine sconosciutaSW end of Umnak Island
- 1817VEI 3Osservata1817-07-02 – fine sconosciuta
- 1790VEI ?Metodo non indicato1790-05-30 – fine sconosciuta
- 1784VEI ?Metodo non indicato1784 – fine sconosciuta
Vulcani nelle vicinanze
Link esterni
⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.