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Long Island

복합화산 · Papua New Guinea · 1263m

The broad profile of Long Island, seen here from the E, is composed of two steep-sided edifices, Mount Reaumur to the north (center) and Cerisy Peak to the south. Collapse of the volcanic complex during at least three major explosive eruptions about 16,000, 4,000, and 300 years ago produced a large 10 x 12.5 km caldera, whose low rim appears at the right.
The broad profile of Long Island, seen here from the E, is composed of two steep-sided edifices, Mount Reaumur to the north (center) and Cerisy Peak to the south. Collapse of the volcanic complex during at least three major explosive eruptions about 16,000, 4,000, and 300 years ago produced a large 10 x 12.5 km caldera, whose low rim appears at the right. · 사진: Photo by Russel Blong, 1976 (Macquarie University). · Wikimedia Commons
화산 유형
복합화산
국가
Papua New Guinea
지역
남서태평양 / Bismarck Volcanic Arc
해발
1263m
좌표
-5.314, 147.105
마지막 분화
1993년
판구조 환경
Subduction zone / Continental crust (> 25 km)
화산 지형
Composite
주요 암석
Andesite / Basaltic Andesite
지질학적 요약

The broad profile of Long Island is dominated by two steep-sided stratovolcanoes, Mount Reaumur in the north and Cerisy Peak in the south. Collapse of the basaltic-andesitic volcanic complex produced a large 10 x 12.5 km caldera, now filled by Lake Wisdom. Caldera formation occurred during at least three major explosive eruptions, about 16,000, 4,000, and 300 years ago. The most recent deposited andesitic tephra across the New Guinea Highlands, prompting legends of a "Time of Darkness." Post-caldera eruptions have constructed a small cone, Motmot Island, in the south-central part of Lake Wisdom. Moderate explosive eruptions have occurred during the 20th century from vents at and near Motmot Island.

Wikipedia 요약

영어 요약

Long Island is a populated volcanic island in Madang Province, Papua New Guinea. It is located north of the island of New Guinea, separated from it by the Vitiaz Strait. The island's interior contains a 360 m-deep (1,180 ft) freshwater volcanic crater lake and within that lake exists an even smaller island known as Motmot island. During the late 17th or early 18th century virtually all of the biota on the island was destroyed and has subsequently provided scientists a unique opportunity to study recolonization efforts by plants, animals, and humans. The vast majority of the buildings on the island are constructed using vernacular architecture.

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분화 이력

요약 (VEI 시계열)
막대를 클릭하면 개별 분화가 표시됩니다
2040 BCE~1848 BCE · 1건 · 최고 VEI 61609~1801 · 1건 · 최고 VEI 61801~1993 · 10건 · 최고 VEI 32040 BCE1080 BCE120 BCE8411801

상세 타임라인

  1. 1993년VEI 1관측 기록
    1993-11-03 ~ 1993-11-25
    E-W fissure NNE of Motmot Island
  2. 1976년VEI 1관측 기록
    1976-01-02 ~ 진행 중
    Motmot
  3. 1973년VEI 2관측 기록
    1973-04-16 ~ 1974-02-28
    Motmot
  4. 1968년VEI 2관측 기록
    1968-03-16 ~ 1968-06-12
    Motmot
  5. 1961년VEI ?지질학적 추정
    1961-07-02 ~ 진행 중
    Motmot
  6. 1955년VEI 3관측 기록
    1955-06-05 ~ 1955-06-13
    Motmot
  7. 1953년VEI 3관측 기록
    1953-05-08 ~ 1954-01-07
    Motmot
  8. 1943년VEI ?관측 기록
    1943-07-02 ~ 진행 중
    Motmot
  9. 1938년VEI ?관측 기록
    1938-07-02 ~ 진행 중
    Lake Wisdom
  10. 1933년VEI ?관측 기록
    1933-07-02 ~ 진행 중
    Lake Wisdom
  11. 1660년 (±20년)VEI 6지질학적 추정
    1660 ~ 진행 중
  12. 기원전 2040년 (±110년)VEI 6지질학적 추정
    BCE 2040 ~ 진행 중

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