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Mount Haruna

Harunasan

Stratovolcano · Japan · 1449m

Harunasan has a small summit caldera containing Haruna-Fuji cone (right). Viscous lava flows and lava domes have formed within and around the caldera. Its western side is currently filled by Lake Haruna, which is visible to the left of the cone. The Futatsudake lava dome, outside the caldera to the E, was the source of two large explosive eruptions during the 6th century CE. This view from the NE also shows a plume emanating from Asamayama on the distant horizon above Lake Haruna.
Harunasan has a small summit caldera containing Haruna-Fuji cone (right). Viscous lava flows and lava domes have formed within and around the caldera. Its western side is currently filled by Lake Haruna, which is visible to the left of the cone. The Futatsudake lava dome, outside the caldera to the E, was the source of two large explosive eruptions during the 6th century CE. This view from the NE also shows a plume emanating from Asamayama on the distant horizon above Lake Haruna. · Photo: Photo by Ichio Moriya (Kanazawa University). · Wikimedia Commons
Type
Stratovolcano
Country
Japan
Region
Northwestern Pacific Volcanic Regions / Northeast Japan Volcanic Arc
Elevation
1449m
Coordinates
36.477, 138.851
Last eruption
550
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

Harunasan volcano is truncated by a small summit caldera containing the symmetrical post-caldera pyroclastic cone of Haruna-Fuji. Harunasan volcano dates back prior to 300,000 years ago and had caldera-producing eruptions at about 200,000 and 40,000 years ago. Viscous lava flows and lava domes were subsequently extruded within and around the caldera, the western side of which is currently partially filled by Lake Haruna. The Futatsudake lava dome east of the caldera was the source of two large explosive eruptions during the 6th century CE.

From Wikipedia

Mount Haruna is a dormant stratovolcano in Gunma Prefecture, in the Kantō region of eastern Honshū, Japan.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
450~460 · 1 eruptions · max VEI 3520~530 · 1 eruptions · max VEI 4540~550 · 1 eruptions · max VEI 5450470500520540

Detailed timeline

  1. 550 (±10 yrs)VEI 5Geological estimate
    550-06-01 – Ongoing
    Futatsu-dake
  2. 520 (±10 yrs)VEI 4Geological estimate
    520-06-01 – Ongoing
    Futatsu-dake
  3. 450 (±50 yrs)VEI 3Geological estimate
    450 – Ongoing
    Futatsu-dake

External links

⚠ For reference only. Not for emergency response.