...It is made up of rhyolite, dacite, and pyroxene andesite, and has a caldera about 4 km in diameter in the center. The somma surrounding it include the highest peak, Mt. Otsukushi (828 m), as well as a series of mountains such as Byobuyama, Hokkokuyama, Shojiyama, Kozuyama, and Maruyama, and further out, parasitic volcanoes such as Mt. Kamabuse and Mt. Asahina rise. Inside the caldera is the nearly circular Lake Usoriyama (Lake Osorezan), 2 km in diameter, and from the northeastern end, the Masatsu River forms a crater rapids and flows out into the Tsugaru Strait. ... *Some of the terminology that refers to "Hokkokuyama" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…流紋岩,石英安山岩,輝石安山岩などからなり,中央に直径約4kmのカルデラをもつ。これをとりまく外輪山として,最高峰の大尽(おおつくし)山(828m)をはじめ,屛風山,北国山,障子山,小尽山,円山などの山々が連なり,さらにその外側には,釜臥(かまぶせ)山,朝比奈岳などの寄生火山がそびえている。カルデラの内側には直径2kmで,ほぼ円形の宇曾利山湖(恐山湖)があり,北東端から正津川が火口瀬となって津軽海峡に流出している。… ※「北国山」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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