미국 · 성층화산
Bogoslof Island
Bogoslof
- 화산 유형
- 성층화산
- 해발
- 150m
- 마지막 분화
- 2017년
- 화산 유형
- 성층화산
- 국가
- 미국
- 지역
- 북아메리카 / Aleutian Ridge Volcanic Arc
- 해발
- 150m
- 좌표
- 53.930, -168.030
- 마지막 분화
- 2017년
- 판구조 환경
- 섭입대 / 중간 지각 (15-25 km)
- 화산 지형
- 복성화산체
- 주요 암석
- 조면안산암 / 현무암질 조면안산암
지질학적 요약
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.
Wikipedia 요약
영어 요약Bogoslof 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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분화 이력
12건 기록용어집상세 타임라인
- 2016년VEI 3관측 기록2016-12-20 ~ 2017-08-30Central vent, just below sea level
- 1992년VEI 3관측 기록1992-07-06 ~ 1992-07-24North tip of island (NE of 1927 dome)
- 1951년VEI 0근거 미기재1951-09-21 ~ 종료일 미상
- 1931년VEI 1관측 기록1931-10-31 ~ 종료일 미상1926-1927 dome
- 1926년VEI 2관측 기록1926-07-16 ~ 1928-07-02Between New and Old Bogoslof
- 1913년VEI ?근거 미기재1913-07-16 ~ 종료일 미상Tahoma Peak
- 1909년VEI 2관측 기록1909-09-16 ~ 1910-09-19Tahoma Peak
- 1908년VEI ?근거 미기재1908-01-15 ~ 종료일 미상Metcalf Peak
- 1906년VEI 3관측 기록1906-03-01 ~ 1907-09-01Metcalf Peak, McCullough Peak
- 1883년VEI 3관측 기록1883-09-27 ~ 1895-07-02New Bogoslof (Grewingk)
- 1806년VEI 2관측 기록1806-07-02 ~ 1823-07-02Old Bogoslof (Castle Rock)
- 1796년VEI 3관측 기록1796-05 ~ 1804-07-02Old Bogoslof (Castle Rock)
주변 화산
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