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Niijima

Domo de 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
Domo de lava
País
Japan
Región
Pacífico Noroccidental / Izu Volcanic Arc
Altitud
432 m
Coordenadas
34.397, 139.270
Última erupción
886
Contexto tectónico
Subduction zone / Oceanic crust (< 15 km)
Forma volcánica
Minor (Silicic)
Roca principal
Rhyolite
Resumen geológico

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.

Resumen de Wikipedia

Resumen en inglés

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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Historial de erupciones

Resumen (VEI en el tiempo)
Haga clic en una barra para ver erupciones individuales
5950 BCE~5722 BCE · 1 erupciones · VEI máx. ?4355 BCE~4127 BCE · 1 erupciones · VEI máx. ?1393 BCE~1165 BCE · 1 erupciones · VEI máx. ?658~886 · 2 erupciones · VEI máx. 45950 BCE4355 BCE2532 BCE937 BCE658

Línea de tiempo detallada

  1. 886VEI 4Observado
    886-06-29 – En curso
    Mukai-yama
  2. 856VEI 2Observado
    856 – 857
    Achi-yama
  3. 1250 a. C.VEI ?Estimación geológica
    BCE 1250 – En curso
  4. 4350 a. C.VEI ?Estimación geológica
    BCE 4350 – En curso
    Niijima-yama
  5. 5950 a. C.VEI ?Estimación geológica
    BCE 5950 – En curso

Enlaces externos

⚠ Solo como referencia. No apto para respuesta ante emergencias.