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Isla Bogoslof

Bogoslof

Estratovolcán · 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
Estratovolcán
País
United States
Región
América del Norte / Aleutian Ridge Volcanic Arc
Altitud
150 m
Coordenadas
53.930, -168.030
Última erupción
2017
Contexto tectónico
Subduction zone / Intermediate crust (15-25 km)
Forma volcánica
Composite
Roca principal
Trachyandesite / Basaltic Trachyandesite
Resumen geológico

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.

Resumen de Wikipedia

Resumen en inglés

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.

Wikipedia · CC BY-SA · Leer artículo completo →

Historial de erupciones

Resumen (VEI en el tiempo)
Haga clic en una barra para ver erupciones individuales
1796~1818 · 2 erupciones · VEI máx. 31862~1884 · 1 erupciones · VEI máx. 31906~1928 · 5 erupciones · VEI máx. 31928~1950 · 1 erupciones · VEI máx. 11950~1972 · 1 erupciones · VEI máx. 01972~1994 · 1 erupciones · VEI máx. 31994~2016 · 1 erupciones · VEI máx. 317961840190619501994

Línea de tiempo detallada

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

Enlaces externos

⚠ Solo como referencia. No apto para respuesta ante emergencias.