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News
Thursday, Dec 18, 2014
White steam plumes were observed during the past week. JMA reports seismic activity remained low, but maintains alert level 3, as sudden phreatic explosions could occur again. [more]
Friday, Nov 14, 2014
JMA reported that cloud cover often prevented visual observations of Ontakesan during 5-11 November; white plumes rose 200-300 m above the crater rim and drifted NE, E, and SE. ... [more]
 

Ontake-san volcano eruptions

complex volcano 3063 m / 10,049 ft
Honshu, Japan, 35.89°N / 137.48°E
Eruption list: 27 Sep 2014, 2007, 1979-80, 774 AD


1979 first historic eruption
Around 5:00 on 28 October 1979 the first historic eruption of On-take volcano occurred from a fissure on the southwestern slope of the main peak, Kengamine.
The eruption produced a tephra column of 1500 meters and there was ashfall in Maebashi City 150 km away. A 30 m diameter crater and 9 small craters on a NW-SE lline were formed above the eruptive fissure.
 

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