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新島

Niijima

溶岩ドーム · 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. · 写真: Photo by Ichio Moriya (Kanazawa University). · Wikimedia Commons
タイプ
溶岩ドーム
国
Japan
地域
北西太平洋 / Izu Volcanic Arc
標高
432m
座標
34.397, 139.270
最終噴火
886年
テクトニクス環境
Subduction zone / Oceanic crust (< 15 km)
火山地形
Minor (Silicic)
主要岩石
Rhyolite
地質学的概要

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 の要約

英語版の要約

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.

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噴火履歴

概要 (VEI時系列)
バーをクリックすると個別の噴火が表示されます
5950 BCE~5722 BCE · 1件 · 最大 VEI ?4355 BCE~4127 BCE · 1件 · 最大 VEI ?1393 BCE~1165 BCE · 1件 · 最大 VEI ?658~886 · 2件 · 最大 VEI 45950 BCE4355 BCE2532 BCE937 BCE658

詳細タイムライン

  1. 886年VEI 4観測記録
    886-06-29 ~ 進行中
    Mukai-yama
  2. 856年VEI 2観測記録
    856 ~ 857
    Achi-yama
  3. 紀元前 1250年VEI ?地質学的推定
    BCE 1250 ~ 進行中
  4. 紀元前 4350年VEI ?地質学的推定
    BCE 4350 ~ 進行中
    Niijima-yama
  5. 紀元前 5950年VEI ?地質学的推定
    BCE 5950 ~ 進行中

外部リンク

⚠ 参考情報です。緊急対応には使用しないでください。