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Nii-jima

Niijima

Duomo di lava · Japan · 432 m

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. · Foto: Photo by Ichio Moriya (Kanazawa University). · Wikimedia Commons
Tipo
Duomo di lava
Paese
Japan
Regione
Northwestern Pacific Volcanic Regions / Izu Volcanic Arc
Altitudine
432 m
Coordinate
34.397, 139.270
Ultima eruzione
886
Contesto tettonico
Subduction zone / Oceanic crust (< 15 km)
Forma vulcanica
Minor (Silicic)
Roccia principale
Rhyolite
Sintesi geologica

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.

Sintesi da Wikipedia

Riassunto in inglese

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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Storia delle eruzioni

Riepilogo (VEI nel tempo)
Fai clic su una barra per vedere le singole eruzioni
5950 BCE~5722 BCE · 1 eruzioni · VEI max. ?4355 BCE~4127 BCE · 1 eruzioni · VEI max. ?1393 BCE~1165 BCE · 1 eruzioni · VEI max. ?658~886 · 2 eruzioni · VEI max. 45950 BCE4355 BCE2532 BCE937 BCE658

Cronologia dettagliata

  1. 886VEI 4Osservata
    886-06-29 – In corso
    Mukai-yama
  2. 856VEI 2Osservata
    856 – 857
    Achi-yama
  3. 1250 a.C.VEI ?Stima geologica
    BCE 1250 – In corso
  4. 4350 a.C.VEI ?Stima geologica
    BCE 4350 – In corso
    Niijima-yama
  5. 5950 a.C.VEI ?Stima geologica
    BCE 5950 – In corso

Link esterni

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