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Nakanoshima

Stratovolcano · Japan · 979m

Nakanoshima island is seen here from a beach on Kuchinoshima to the NNE. The active cone of Ontake to the right has a summit crater that fills with water during the rainy season. The 9 x 5 km island is surrounded by coral reefs, and a flat plateau separates it from an older dissected volcano to the south. Minor activity has been reported in historical time.
Nakanoshima island is seen here from a beach on Kuchinoshima to the NNE. The active cone of Ontake to the right has a summit crater that fills with water during the rainy season. The 9 x 5 km island is surrounded by coral reefs, and a flat plateau separates it from an older dissected volcano to the south. Minor activity has been reported in historical time. · Photo: Copyrighted photo by Shun Nakano, 2005 (Japanese Quaternary Volcanoes database, RIODB, http://riodb02.ibase.aist.go.jp/strata/VOL_JP/EN/index.htm and Geol Surv Japan, AIST, http://www.gsj.jp/). · Wikimedia Commons
Type
Stratovolcano
Country
Japan
Region
Western Pacific / Ryukyu Volcanic Arc
Elevation
979m
Coordinates
29.859, 129.857
Last eruption
1914
Tectonic setting
Subduction zone / Oceanic crust (< 15 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

The 9 x 5 km island of Nakanoshima is surrounded by coral reefs. A flat plateau separates the older dissected Sakiwaridake volcano on the south from the active andesitic cone of Ontake, which forms the northern half of the island. Ontake contains a summit crater that is filled with water during the rainy season. Sulfur deposits were mined at a SE-flank solfatara until 1944. Only very minor activity has been reported in historical time. A small mud eruption took place in 1914 at the summit crater, and "smoking" increased in 1949.

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
1914~1918 · 1 eruptions · max VEI 11946~1949 · 1 eruptions · max VEI 119141921193219391946

Detailed timeline

  1. 1949VEI 1Geological estimate
    1949-10-16 – Ongoing
    On-take
  2. 1914VEI 1Observed
    1914-01-16 – Ongoing
    On-take

External links

⚠ For reference only. Not for emergency response.