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Nii-jima

Niijima

Lava dome · 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. · Photo: Photo by Ichio Moriya (Kanazawa University). · Wikimedia Commons
Type
Lava dome
Country
Japan
Region
Northwestern Pacific Volcanic Regions / Izu Volcanic Arc
Elevation
432m
Coordinates
34.397, 139.270
Last eruption
886
Tectonic setting
Subduction zone / Oceanic crust (< 15 km)
Landform
Minor (Silicic)
Major rock type
Rhyolite
Geological summary

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.

From Wikipedia

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 · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
5950 BCE~5722 BCE · 1 eruptions · max VEI ?4355 BCE~4127 BCE · 1 eruptions · max VEI ?1393 BCE~1165 BCE · 1 eruptions · max VEI ?658~886 · 2 eruptions · max VEI 45950 BCE4355 BCE2532 BCE937 BCE658

Detailed timeline

  1. 886VEI 4Observed
    886-06-29 – Ongoing
    Mukai-yama
  2. 856VEI 2Observed
    856 – 857
    Achi-yama
  3. 1250 BCEVEI ?Geological estimate
    BCE 1250 – Ongoing
  4. 4350 BCEVEI ?Geological estimate
    BCE 4350 – Ongoing
    Niijima-yama
  5. 5950 BCEVEI ?Geological estimate
    BCE 5950 – Ongoing

External links

⚠ For reference only. Not for emergency response.