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니지마섬

Niijima

용암돔 · Japan · 432m

Stratified phreatomagmatic deposits are exposed along a cliff on the eastern coast of Niijima, with the flat-topped Miyazukayama lava dome in the background. The 11-km-long island is comprised of eight rhyolite lava domes clustered in two groups. The Mukaiyama complex at the southern end of the island and Achiyama lava dome at the northern end formed during the 9th century CE.
Stratified phreatomagmatic deposits are exposed along a cliff on the eastern coast of Niijima, with the flat-topped Miyazukayama lava dome in the background. The 11-km-long island is comprised of eight rhyolite lava domes clustered in two groups. The Mukaiyama complex at the southern end of the island and Achiyama lava dome at the northern end formed during the 9th century CE. · 사진: Photo by Ichio Moriya (Kanazawa University). · Wikimedia Commons
화산 유형
용암돔
국가
Japan
지역
Northwestern Pacific Volcanic Regions / Izu Volcanic Arc
해발
432m
좌표
34.397, 139.270
마지막 분화
886년
판구조 환경
Subduction zone / Oceanic crust (< 15 km)
화산 지형
Minor (Silicic)
주요 암석
Rhyolite
지질학적 요약

The elongated island of Niijima, SSW of Oshima, is 11 km long and only 2.5 km wide. Eight low rhyolitic lava domes are clustered in two groups at the northern and southern ends of the island, separated by an area of flat-topped domes and a low isthmus of pyroclastic deposits. The Mukaiyama complex on the south and the Atchiyama lava dome on the north were formed during eruptions in the 9th century CE, the last known activity. Shikineyama and Zinaito domes form small islands immediately to the SW and W, respectively, during earlier stages of volcanism. Earthquake swarms occurred during the 20th century.

Wikipedia 요약

영어 요약

Nii-jima (新島) is a volcanic Japanese island administered by the Tokyo Metropolitan Government. It is one of the Izu Seven Islands, group of the seven northern islands of the Izu archipelago, and is located approximately 163 kilometres (101 mi) south of Tōkyō and 36 kilometres (22 mi) south of Shimoda Shizuoka Prefecture. The island is the larger inhabited component of the village of Niijima Village, Ōshima Subprefecture of Tokyo Metropolis, which also contains the neighboring island of Shikine-jima and the smaller, uninhabited Jinai-tō. Nii-jima is also within the boundaries of the Fuji-Hakone-Izu National Park.

Wikipedia · CC BY-SA · 전체 기사 보기 →

분화 이력

요약 (VEI 시계열)
막대를 클릭하면 개별 분화가 표시됩니다
5950 BCE~5722 BCE · 1건 · 최고 VEI ?4355 BCE~4127 BCE · 1건 · 최고 VEI ?1393 BCE~1165 BCE · 1건 · 최고 VEI ?658~886 · 2건 · 최고 VEI 45950 BCE4355 BCE2532 BCE937 BCE658

상세 타임라인

  1. 886년VEI 4관측 기록
    886-06-29 ~ 진행 중
    Mukai-yama
  2. 856년VEI 2관측 기록
    856 ~ 857
    Achi-yama
  3. 기원전 1250년VEI ?지질학적 추정
    BCE 1250 ~ 진행 중
  4. 기원전 4350년VEI ?지질학적 추정
    BCE 4350 ~ 진행 중
    Niijima-yama
  5. 기원전 5950년VEI ?지질학적 추정
    BCE 5950 ~ 진행 중

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