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Komaga-take volcanostratovolcano 1131 m / 3,711 ft
Hokkaido, Japan, 42.06°N / 140.68°E Current status: dormant (1 out of 5) [hide map] [enlarge map]
Typical eruption style: explosive
Komaga-take volcano eruptions: 2000, 1998, 1996, 1942, 1937, 1935 (?), 1929 (Plinian), 1928 (?), 1924, 1923, 1922, 1919, 1905, 1888, 1856 (Plinian), 1784, 1765, 1710 (?), 1694 (Plinian), 1640 (Plinian) radiocarbon-dated: 4350 BC (?), 4500 BC ± 150 years (Plinian), 4600 BC ± 50 years (Plinian) Last earthquakes nearby:
Background:Komaga-take volcano is a truncated stratovolcano with a sharp top rising over a large breached crater, which formed after a catastrophic edifice collapse in 1640 AD. The hummocky debris avalanche deposit can be seen at 3 sides at the base of the volcano.Most of the andesitic Komaga-take volcano is older than 12,000 years. In the past 20,000 years, there were at least 8 Plinian eruptions: 2 in the late Pleistocene, 2 Holocene eruptions around 6500 years ago, and the 4 historic Plinian eruptions in 1640, 1694, 1856, and 1929. Synonyms for Komaga-take (Komagatake) are: Hokkaido Komagatake (北海道駒ヶ岳), Oshima Komagatake (渡島駒ヶ岳?), Oshima Fuji (渡島富士?), or just Komagatake (駒ヶ岳). 2000 eruptions
Small ash eruptions occurred at Komaga-take volcano on 4 and 18 September 2000. 1998 eruption
A small phreatic eruption occurred at Komagatake volcano on 25 October 1998, producing an ash cloud rising 1200 m above the crater. 1996 Eruption
Following increased seismic tremor and inflation, a small phreatic eruption from the 1929 crater occurred on 5 March 1996, producing an ash cloud of 300-500 m height. Light ash fall was recorded up to 10 km from the summit. The total erupted mass of tephra was estimated at about 25,000 tons. Source: Smithsonian / GVP monthly reports 1929 Plinian eruption
The most recent major magmatic eruption of Komaga-take volcano occurred on 17 June 1929 and continued with minor activity for 7 weeks. It ranks as a Plinian eruption and produced pumice fall and pyroclastic flows. The eruption killed 2 people and caused widespread damage. ...more 1640 AD Plinian eruption and tsunami
The 1640 eruption was (probably) the largest in Japan's history and started a period of more frequent explosive activity. It deposited ash as far away as central Honshu and produced a debris avalanche that reached the sea. The resulting tsunami caused 700 fatalities. |
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