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Hokkaidō Koma-ga-take

Hokkaido-Komagatake

Stratovolcano · Japan · 1131m

Komagatake on the Oshima Peninsula of southern Hokkaido rises to the N above Lake Onuma and is one of the most active volcanoes of Japan's northernmost island. The summit formed as a result of edifice collapse and hummocky debris avalanche deposits were responsible for the formation of Lake Onuma. A period of more frequent explosive activity began with a major explosive eruption in 1640.
Komagatake on the Oshima Peninsula of southern Hokkaido rises to the N above Lake Onuma and is one of the most active volcanoes of Japan's northernmost island. The summit formed as a result of edifice collapse and hummocky debris avalanche deposits were responsible for the formation of Lake Onuma. A period of more frequent explosive activity began with a major explosive eruption in 1640. · Photo: Photo by Ichio Moriya (Kanazawa University). · Wikimedia Commons
Type
Stratovolcano
Country
Japan
Region
Northwestern Pacific Volcanic Regions / Northeast Japan Volcanic Arc
Elevation
1131m
Coordinates
42.063, 140.677
Last eruption
2000
Tectonic setting
Subduction zone / Continental crust (> 25 km)
Landform
Composite
Major rock type
Andesite / Basaltic Andesite
Geological summary

Much of the truncated Hokkaido-Komagatake andesitic volcano on the Oshima Peninsula of southern Hokkaido is Pleistocene in age. The sharp-topped summit lies at the western side of a large breached crater that formed as a result of edifice collapse in 1640 CE. Hummocky debris avalanche material occurs at the base of the volcano on three sides. Two late-Pleistocene and two Holocene Plinian eruptions occurred prior to the first historical eruption in 1640, which began a period of more frequent explosive activity. The 1640 eruption, one of the largest in Japan during historical time, deposited ash as far away as central Honshu and produced a debris avalanche that reached the sea. The resulting tsunami caused 700 fatalities. Three Plinian eruptions have occurred since 1640; in 1694, 1856, and 1929.

From Wikipedia

Hokkaidō Koma-ga-take , also Oshima Koma-ga-take (渡島駒ヶ岳), Oshima Fuji (渡島富士), or just Koma-ga-take (駒ヶ岳) is a 1,131 metres (3,711 ft) andesitic stratovolcano on the border between Mori, Shikabe, and Nanae, all within the Oshima Subprefecture of Hokkaidō, Japan.

Wikipedia · CC BY-SA · Read full article →

Eruption history

Summary (VEI over time)
Click a bar to see individual eruptions
4600 BCE~4380 BCE · 2 eruptions · max VEI 54380 BCE~4160 BCE · 1 eruptions · max VEI 41560~1780 · 4 eruptions · max VEI 51780~2000 · 16 eruptions · max VEI 44600 BCE3060 BCE1300 BCE2401780

Detailed timeline

  1. 2000VEI 1Observed
    2000-09-04 – 2000-11-08
  2. 1998VEI 2Observed
    1998-10-25 – 1998-10-25
    1996 crater
  3. 1996VEI 1Observed
    1996-03-05 – 1996-03-12
    1929 crater and summit crater fissure
  4. 1942VEI 3Observed
    1942-11-16 – 1942-11-18
    NW-SE 1.6-km fissure
  5. 1937VEI 1Observed
    1937-03-17 – 1937-03-19
  6. 1935VEI ?Geological estimate
    1935-10-15 – 1935-10-15
  7. 1929VEI 4Observed
    1929-06-17 – 1929-09-06
    SE and NE of Ansei Crater
  8. 1928VEI 1Observed
    1928-03-28 – Ongoing
  9. 1924VEI 2Observed
    1924-07-31 – Ongoing
  10. 1923VEI 2Observed
    1923-02-27 – 1923-03-15
  11. 1922VEI 2Observed
    1922-05-22 – Ongoing
  12. 1919VEI 2Observed
    1919-06-17 – 1919-07-26
    SE of Ansei Crater
  13. 1905VEI 2Observed
    1905-08-19 – 1905-09-01
    South of Ansei Crater
  14. 1888VEI 2Observed
    1888-04-14 – Ongoing
    NW side of 1856 (Ansei) crater
  15. 1856VEI 4Observed
    1856-09-25 – Ongoing
    Ansei Crater
  16. 1784VEI 2Geological estimate
    1784-02-08 – Ongoing
  17. 1765VEI 2Geological estimate
    1765 – Ongoing
  18. 1710VEI ?Geological estimate
    1710-06-27 – Ongoing
  19. 1694VEI 4Observed
    1694-07-04 – 1694-07-06
  20. 1640VEI 5Observed
    1640-07-31 – 1640-10-09
  21. 4350 BCEVEI 4Geological estimate
    BCE 4350 – Ongoing
  22. 4500 BCE (±150 yrs)VEI ?Geological estimate
    BCE 4500 – Ongoing
  23. 4600 BCE (±50 yrs)VEI 5Geological estimate
    BCE 4600 – Ongoing

External links

⚠ For reference only. Not for emergency response.