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시에라네그라산

Negra, Sierra

순상화산 · Ecuador · 1124m

An aerial view of the SW caldera floor of Sierra Negra volcano shows El Azufre fumarolic field and the trap-door fault to the left. This sinuous 14-km-long, N-S-trending ridge occupies the west part of the caldera floor, which lies only about 100 m below its rim. El Azufre, the largest fumarolic area in the Galápagos Islands, lies within a graben between this ridge and the west caldera wall. The broad shield volcano of Sierra Negra at the southern end of Isabela Island contains a shallow 7 x 10.5 km caldera that is the largest in the Galápagos Islands.
An aerial view of the SW caldera floor of Sierra Negra volcano shows El Azufre fumarolic field and the trap-door fault to the left. This sinuous 14-km-long, N-S-trending ridge occupies the west part of the caldera floor, which lies only about 100 m below its rim. El Azufre, the largest fumarolic area in the Galápagos Islands, lies within a graben between this ridge and the west caldera wall. The broad shield volcano of Sierra Negra at the southern end of Isabela Island contains a shallow 7 x 10.5 km caldera that is the largest in the Galápagos Islands. · 사진: Photo by Patricio Ramon, 2005 (Instituto Geofisca, Escuela Politecnica Nacional). · Wikimedia Commons
화산 유형
순상화산
국가
Ecuador
지역
동태평양 / Galapagos Hotspot Volcano Group
해발
1124m
좌표
-0.830, -91.170
마지막 분화
2018년
판구조 환경
Rift zone / Oceanic crust (< 15 km)
화산 지형
Shield
주요 암석
Basalt / Picro-Basalt
지질학적 요약

The broad shield volcano of Sierra Negra at the southern end of Isabela Island contains a shallow 7 x 10.5 km caldera that is the largest in the Galápagos Islands. Flank vents abound, including cinder cones and spatter cones concentrated along an ENE-trending rift system and tuff cones along the coast and forming offshore islands. Although it is the largest of the five major Isabela volcanoes, it has the flattest slopes, averaging less than 5° and diminishing to 2° near the coast. A sinuous 14-km-long, N-S-trending ridge occupies the west part of the caldera floor, which lies only about 100 m below its rim. The Volcán de Azufre fumarolic area lies within a graben between this ridge and the west caldera wall. Lava flows from a major eruption in 1979 extend all the way to the north coast from circumferential fissure vents on the upper northern flank.

Wikipedia 요약

영어 요약

Sierra Negra is a large shield volcano at the southeastern end of Isabela Island in the Galapagos that rises to an altitude of 1124m. It coalesces with the volcanoes Cerro Azul to the west and Alcedo to the north. It is one of the most active of the Galapagos volcanoes with the most recent historic eruption beginning in June 2018 and continuing through the summer.

Wikipedia · CC BY-SA · 전체 기사 보기 →

분화 이력

요약 (VEI 시계열)
막대를 클릭하면 개별 분화가 표시됩니다
8250 BCE~7908 BCE · 1건 · 최고 VEI 01405 BCE~1062 BCE · 1건 · 최고 VEI 0307~649 · 1건 · 최고 VEI 0991~1333 · 1건 · 최고 VEI 01333~1676 · 1건 · 최고 VEI 01676~2018 · 13건 · 최고 VEI 38250 BCE5854 BCE3116 BCE720 BCE1676

상세 타임라인

  1. 2018년VEI 2관측 기록
    2018-06-26 ~ 2018-08-23
    Summit crater and NNW flank, Volcan Chico fissure vent
  2. 2005년VEI 3관측 기록
    2005-10-22 ~ 2005-10-30
    North caldera rim
  3. 1979년VEI 3관측 기록
    1979-11-13 ~ 1980-01-14
    Upper NW and NE flanks (Volcán Chico)
  4. 1963년VEI 2관측 기록
    1963-04-13 ~ 1963-05-16
    Volcán Chico area & NW caldera rim
  5. 1957년VEI ?지질학적 추정
    1957-07-02 ~ 진행 중
    Volcano Uncertain: Isabela Island
  6. 1954년VEI 2지질학적 추정
    1954-11-09 ~ 진행 중
    Volcano Uncertain: originally Alcedo
  7. 1953년VEI 3관측 기록
    1953-08-27 ~ 1954-01-16
    Volcán Chico area & NW caldera rim
  8. 1948년VEI 2관측 기록
    1948-08-16 ~ 1949-02-16
  9. 1911년VEI ?관측 기록
    1911-12-31 ~ 진행 중
  10. 1860년VEI 2지질학적 추정
    1860-07-02 ~ 진행 중
    Volcano Uncertain: Isabela Island
  11. 1844년VEI 0지질학적 추정
    1844-07-02 ~ 진행 중
    Volcano Uncertain: Isabela Island
  12. 1817년VEI ?지질학적 추정
    1817-07-02 ~ 진행 중
    Volcano Uncertain: Isabela Island
  13. 1813년VEI 2지질학적 추정
    1813-07-13 ~ 진행 중
    Volcano Uncertain: South end of Isabela Island
  14. 1350년 (±500년)VEI 0지질학적 추정
    1350 ~ 진행 중
  15. 1060년 (±500년)VEI 0지질학적 추정
    1060 ~ 진행 중
  16. 370년 (±1100년)VEI 0지질학적 추정
    370 ~ 진행 중
  17. 기원전 1250년 (±100년)VEI 0지질학적 추정
    BCE 1250 ~ 진행 중
    SE flank
  18. 기원전 8250년 (±1600년)VEI 0지질학적 추정
    BCE 8250 ~ 진행 중

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