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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

complex volcano 3063 m / 10,049 ft
Honshu, Japan, 35.89°N / 137.48°E
Current status: restless (2 out of 5)
Ontake-san webcams / live data
Ontake-san volcano books
Last update: 4 Jun 2016 (steaming, low seismic activity)
Typical eruption style: explosive
Ontake-san volcano eruptions: 27 Sep 2014, 2007, 1979-80, 774 AD Mt.Ontake, viewed from Kuzo Pass of Route 361 (pictrure: Atsushi Ueda / Wiki Commons)
TimeMag. / DepthDistanceLocation
Wed, 28 Jun
Wed, 28 Jun 09:23 UTCM 3.5 / 5.8 km8 kmWESTERN NAGANO PREF
Tue, 27 Jun
Tue, 27 Jun 18:33 UTCM 3.2 / 5.4 km8 kmWESTERN NAGANO PREF
Tue, 27 Jun 14:12 UTCM 2.7 / 5.8 km10 kmWESTERN NAGANO PREF
Tue, 27 Jun 13:55 UTCM 3.2 / 8.2 km19 kmWESTERN NAGANO PREF
Tue, 27 Jun 11:20 UTCM 2.5 / 6 km9 kmWESTERN NAGANO PREF
View all recent quakes
On-take, or correctly Ontake-san (御嶽山), is a massive stratovolcano and the second highest in Japan. It is located at the southern end of the Northern Japan Alps.
Its first historic eruption occurred in 1979. A landslide in 1984 was not related to an eruption and produced a debris avalanche and lahar running down valleys south and east of the volcano.
On-take volcano is one of the holy mountains of Japan and the destination for religious pilgrimage since 1792.

Background:

On-take's summit cone was built in a largely buried 4 x 5 km caldera. It lies at the southern end of the Norikura volcanic zone, which extends northward through Norikura volcano to Yake-dake volcano.
The older volcanic complex of Ontake consists of at least 4 major stratovolcanoes that were constructed from about 680,000 to about 420,000 years ago, after which On-take was inactive for more than 300,000 years.
The broad, elongated summit of the younger edifice is cut by a series of small explosion craters along a NNE-trending line. Several phreatic eruptions from On-take post-date the roughly 7300-year-old Akahoya tephra from Kikai caldera.
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Source: On-take volcano information from Smithsonian / GVP

Ontake-san Photos:



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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