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Stati Uniti · Stratovulcano

Bogoslof

Tipo
Stratovulcano
Altitudine
150 m
Ultima eruzione
2017
Bogoslof
Foto: T. Keith, U.S. Geological Survey · Public domain · Wikimedia Commons
Tipo
Stratovulcano
Paese
Stati Uniti
Regione
Nord America / Aleutian Ridge Volcanic Arc
Altitudine
150 m
Coordinate
53.930, -168.030
Ultima eruzione
2017
Contesto tettonico
Zona di subduzione / Crosta intermedia (15-25 km)
Forma vulcanica
Composito
Roccia principale
Trachiandesite / Trachiandesite basaltica
Sintesi geologica

Bogoslof is the emergent summit of a submarine volcano that lies 40 km N of the main Aleutian arc. It rises 1,500 m above the Bering Sea floor. Repeated construction and destruction of lava domes at different locations during historical time has greatly modified the appearance of this "Jack-in-the-Box" volcano and has introduced a confusing nomenclature applied during frequent visits by exploring expeditions. The present triangular-shaped, 0.75 x 2 km island consists of remnants of lava domes emplaced from 1796 to 1992. Castle Rock (Old Bogoslof) is a steep-sided pinnacle that is a remnant of a spine from the 1796 eruption. The small Fire Island (New Bogoslof), about 600 m NW of Bogoslof Island, is a remnant of a lava dome formed in 1883.

Sintesi da Wikipedia

Riassunto in inglese

Bogoslof Island or Agasagook Island is the summit of a submarine stratovolcano at the south edge of the Bering Sea, 35 miles (56 km) northwest of Unalaska Island of the Aleutian Islands chain. It has a land area of 319.3 acres (1.292 km2) and is uninhabited. It is 1,040 meters (3,410 ft) long and 1,512 m (4,961 ft) wide, with a peak elevation of 490 feet (150 m). The stratovolcano rises about 6,000 ft (1,800 m) from the seabed, but the summit is the only part that projects above sea level. The island is believed to be relatively new, with the volcano being entirely below sea level before 1796, and most of the presently 300-acre island being formed by eruptions since 1900.

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Storia delle eruzioni

12 registrateGlossario
Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni · Usa le frecce per spostarti tra le barre, Invio per aprire
1796~1818 · 2 eruzioni · VEI max. 31862~1884 · 1 eruzioni · VEI max. 31906~1928 · 5 eruzioni · VEI max. 31928~1950 · 1 eruzioni · VEI max. 11950~1972 · 1 eruzioni · VEI max. 01972~1994 · 1 eruzioni · VEI max. 31994~2016 · 1 eruzioni · VEI max. 317961840190619501994

Cronologia dettagliata

  1. 2016VEI 3Osservata
    2016-12-20 – 2017-08-30
    Central vent, just below sea level
  2. 1992VEI 3Osservata
    1992-07-06 – 1992-07-24
    North tip of island (NE of 1927 dome)
  3. 1951VEI 0Metodo non indicato
    1951-09-21 – fine sconosciuta
  4. 1931VEI 1Osservata
    1931-10-31 – fine sconosciuta
    1926-1927 dome
  5. 1926VEI 2Osservata
    1926-07-16 – 1928-07-02
    Between New and Old Bogoslof
  6. 1913VEI ?Metodo non indicato
    1913-07-16 – fine sconosciuta
    Tahoma Peak
  7. 1909VEI 2Osservata
    1909-09-16 – 1910-09-19
    Tahoma Peak
  8. 1908VEI ?Metodo non indicato
    1908-01-15 – fine sconosciuta
    Metcalf Peak
  9. 1906VEI 3Osservata
    1906-03-01 – 1907-09-01
    Metcalf Peak, McCullough Peak
  10. 1883VEI 3Osservata
    1883-09-27 – 1895-07-02
    New Bogoslof (Grewingk)
  11. 1806VEI 2Osservata
    1806-07-02 – 1823-07-02
    Old Bogoslof (Castle Rock)
  12. 1796VEI 3Osservata
    1796-05 – 1804-07-02
    Old Bogoslof (Castle Rock)

Vulcani nelle vicinanze

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⚠ Solo a scopo informativo. Non adatto a situazioni di emergenza.