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United States · Stratovolcano

Bogoslof Island

Bogoslof

Type
Stratovolcano
Elevation
150m
Last eruption
2017
Bogoslof Island
Photo: T. Keith, U.S. Geological Survey · Public domain · Wikimedia Commons
Type
Stratovolcano
Country
United States
Region
North America / Aleutian Ridge Volcanic Arc
Elevation
150m
Coordinates
53.930, -168.030
Last eruption
2017
Tectonic setting
Subduction zone / Intermediate crust (15-25 km)
Landform
Composite
Major rock type
Trachyandesite / Basaltic trachyandesite
Geological summary

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.

From Wikipedia

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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Eruption history

12 recordedGlossary
Summary (VEI over time)
Click a bar to see individual eruptions · Use arrow keys to move between bars, Enter to open
1796~1818 · 2 eruptions · max VEI 31862~1884 · 1 eruptions · max VEI 31906~1928 · 5 eruptions · max VEI 31928~1950 · 1 eruptions · max VEI 11950~1972 · 1 eruptions · max VEI 01972~1994 · 1 eruptions · max VEI 31994~2016 · 1 eruptions · max VEI 317961840190619501994

Detailed timeline

  1. 2016VEI 3Observed
    2016-12-20 – 2017-08-30
    Central vent, just below sea level
  2. 1992VEI 3Observed
    1992-07-06 – 1992-07-24
    North tip of island (NE of 1927 dome)
  3. 1951VEI 0Method not stated
    1951-09-21 – end unknown
  4. 1931VEI 1Observed
    1931-10-31 – end unknown
    1926-1927 dome
  5. 1926VEI 2Observed
    1926-07-16 – 1928-07-02
    Between New and Old Bogoslof
  6. 1913VEI ?Method not stated
    1913-07-16 – end unknown
    Tahoma Peak
  7. 1909VEI 2Observed
    1909-09-16 – 1910-09-19
    Tahoma Peak
  8. 1908VEI ?Method not stated
    1908-01-15 – end unknown
    Metcalf Peak
  9. 1906VEI 3Observed
    1906-03-01 – 1907-09-01
    Metcalf Peak, McCullough Peak
  10. 1883VEI 3Observed
    1883-09-27 – 1895-07-02
    New Bogoslof (Grewingk)
  11. 1806VEI 2Observed
    1806-07-02 – 1823-07-02
    Old Bogoslof (Castle Rock)
  12. 1796VEI 3Observed
    1796-05 – 1804-07-02
    Old Bogoslof (Castle Rock)

Nearby volcanoes

External links

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