...A small caldera was formed about 50,000 years ago, and 40,000 years ago, before the lava dome was formed, Kanuma pumice, known as Kanuma soil and widely used for bonsai, erupted from the small caldera. Since the explosive activity that created Konuma 10,000 years ago, there has been no notable activity, but a record of an eruption in the 12th century is recorded in the Azuma Kagami as "Akagi-dake Yaki, Kozuke Province." Radiating valleys such as the Sekase River and Miyama River, which flow out of the small caldera, as well as the Arato River, Shirakawa River, and Fukazawa River, have deeply eroded the mountain body. ... *Some of the terminology that mentions "Akagi [Hot Springs]" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…5万年ほど前に小カルデラが形成され,4万年前,溶岩円頂丘が形成される前に鹿沼土と呼ばれ盆栽に広く用いられる鹿沼降下軽石が小カルデラから噴出した。1万年前の小沼をつくった爆裂活動以後,目立った活動はないが12世紀に噴火したという記録が《吾妻鏡》に〈上野国赤城岳焼〉として記されている。小カルデラから流出する火口瀬粕川,深山(みやま)川をはじめ,荒砥川,白川,深沢川などの放射谷が山体を深く浸食している。… ※「赤城[温泉]」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 |
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