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Chokai volcano eruptions

stratovolcanoes 2233 m / 7,326 ft
Honshu, Japan, 39.1°N / 140.05°E
Eruption list: March-April 1974: phreatic ash explosions and mud flows
1834: phreatic explosions and mud flows
1821: phreatic explosions
1800-04, 1764 (?), 1740-47, 1738±1 (?), 1735 (?), 1659-63, 1560 (?), 1477 (?), 999 AD (?), 948±1, 939, (915: no eruption, was from Towada volcano), 884 (?), 871, 861 (?), 857 (?), 856 (?), 839 (?), 830, 817 AD ± 7 years, 804-06, 717 (?), 711± 3 years, 610± 18 years (?), 577-78 (?), 573 (?), 450 BC, 650 BC, 1050 BC (?)


1974 eruption
"After a long period of inactivity (since 1821), Tyokai volcano blew up on 1 March" reads the beginning of a bulletin received by the Smithsonian Institution on 1 April 1974.
The eruption took place in 2 phases, at the beginning of March and at the end of April 1974 and consisted in phreatic explosions generating mud flows at the snow-covered summit of Chokai volcano. It followed 153 years of dormancy. No magma reached the surface, but a very shallow intrusion was the cause of the eruptionn.
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1800-1804 eruption and fatalities
An eruption began at Kojin-yama crater and built a lava dome (Shinzan). The eruption caused fatalities when climbers were killed by ballistic blocks ejected during an explosion in 1801.
 

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