Hachimantai Volcano | John Seach


Honshu, Japan

39.95 N, 140.85 E
summit elevation 1614 m

Hachimantai Volcano is located in northern Honshu, Japan. Hachimantai volcanic filed contains composite cones and calderas clustered in 500 sq km region called Sengan.

Hachimantai volcanic field comprises two major andesite cones (Hachimantai and Chausudake), two major basalt cones (Nishimoriyama and Maemoriyama), and numerous minor dacitic, andesitic, and basaltic cones (Ebisumori, Daikokumori,Yanomunedake, Appidake).

Ebisumori, Daikokumori, and Yanomunedake cones are aligned roughly WSW-ENE between the Chausudake and Maemoriyama cones.

Solfatara are active on the western and southern flanks of the volcano. The volcano is located in Towada-Hachimantai National Park.

Geology of Hachimantai Volcano
Volcanic rocks of the Hachimantai geothermal area are divided into the following five groups on the basis of stratigraphy and petrography.

(1) Rhyolitic tuff of the Tamagawa Welded Tufts.
(2) Andesite lava and pyroclastic tuff related to the Tamagawa Welded
Tuffs (the Magarisakiyama Lavas and the Yasemori Volcanic Breccias).
3) Andesitic lava of the Matsukawa Andesite.
4) Dacitic tuff of the Kashinai Formation.
5) Andesitic lava of the Young Volcanics excluding Moriyoshi Volcano.

Hachimantai Volcano Eruptions

No recent eruptions.