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Bogoslof

Stratovulcano · United States · 150 m

Bogoslof is the summit of a largely submarine volcano located in the Bering Sea, 50 km behind the main Aleutian arc. The island is about 1.5 x 0.6 km wide and due to its frequent eruptive activity and energetic wave action, has changed shape dramatically since it was first mapped in the late 1700s. The rounded lava dome and offshore spire at the northern tip of the island (bottom-center) formed in 1992. The circular, flat area at the right is a remnant of the 1927 lava dome, and the steep pinnacle is Castle Rock, a 1796 dome remnant.
Bogoslof is the summit of a largely submarine volcano located in the Bering Sea, 50 km behind the main Aleutian arc. The island is about 1.5 x 0.6 km wide and due to its frequent eruptive activity and energetic wave action, has changed shape dramatically since it was first mapped in the late 1700s. The rounded lava dome and offshore spire at the northern tip of the island (bottom-center) formed in 1992. The circular, flat area at the right is a remnant of the 1927 lava dome, and the steep pinnacle is Castle Rock, a 1796 dome remnant. · Foto: Photo by Terry Keith, 1994 (Alaska Volcano Observatory, U.S. Geological Survey). · Wikimedia Commons
Tipo
Stratovulcano
Paese
United States
Regione
North America Volcanic Regions / Aleutian Ridge Volcanic Arc
Altitudine
150 m
Coordinate
53.930, -168.030
Ultima eruzione
2017
Contesto tettonico
Subduction zone / Intermediate crust (15-25 km)
Forma vulcanica
Composite
Roccia principale
Trachyandesite / Basaltic Trachyandesite
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

L'isola Bogoslof è la parte che affiora dalle acque del mare di Bering dello stratovulcano sottomarino omonimo, la cui sommità raggiunge i 150 m. L'isola è disabitata e appartiene all'Alaska ; si trova 43 km a nord di Umnak.

Wikipedia · CC BY-SA · Leggi l'articolo completo →

Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
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 0Stima geologica
    1951-09-21 – In corso
  4. 1931VEI 1Osservata
    1931-10-31 – In corso
    1926-1927 dome
  5. 1926VEI 2Osservata
    1926-07 – 1928
    Between New and Old Bogoslof
  6. 1913VEI ?Stima geologica
    1913-07 – In corso
    Tahoma Peak
  7. 1909VEI 2Osservata
    1909-09 – 1910-09-19
    Tahoma Peak
  8. 1908VEI ?Stima geologica
    1908-01-15 – In corso
    Metcalf Peak
  9. 1906VEI 3Osservata
    1906-03-01 – 1907-09-01
    Metcalf Peak, McCullough Peak
  10. 1883VEI 3Osservata
    1883-09-27 – 1895
    New Bogoslof (Grewingk)
  11. 1806VEI 2Osservata
    1806 – 1823
    Old Bogoslof (Castle Rock)
  12. 1796VEI 3Osservata
    1796-05 – 1804
    Old Bogoslof (Castle Rock)

Link esterni

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