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Komaga-take volcan éruptions

stratovolcan 1131 m / 3,711 ft
Hokkaido, Japon, 42.06°N / 140.68°E
Liste des éruptions: 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)


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.

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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