Kita Hakkoda volcanic group

...Based on the Neogene layer, the caldera was formed after the eruption of a large amount of dacite pumice flow, and is dotted with stratovolcanoes and lava domes composed mainly of pyroxene andesite, dacite, and rhyolite. The mountain range is divided into the Kita-Hakkoda Volcanic Group and the Minami-Hakkoda Volcanic Group by the Arakawa River, which runs west, and the Tsuta River, which runs east. The Kita-Hakkoda Volcanic Group consists of the Maedake, Tamoyatsu-dake (1324m), Akakura-dake (1548m), Ido-dake (1550m), and O-dake (1585m), which are lined up from north to south....

*Some of the terms mentioned in the "Kita-Hakkoda Volcanic Group" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…新第三紀層を基盤とし，大量の石英安山岩質の軽石流を噴出したのち生じたカルデラ上に，輝石安山岩を主に石英安山岩，流紋岩などからなる成層火山と溶岩円頂丘が散在する。山群の中を西流する荒川と東流する蔦（つた）川の谷を境として北八甲田火山群と南八甲田火山群に分けられる。　北八甲田火山群は南北に並ぶ前岳，田茂萢（たもやつ）岳(1324m)，赤倉岳(1548m)，井戸岳(1550m)，大岳(1585m。…

※「北八甲田火山群」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報