Okada Volcano

Japanese: 岡田火山 - おかだかざん
Okada Volcano

… In the north of the island is Oshima Airport (opened in 1955), which has three round trip flights a day from Haneda. [Hajime Omura]
[Oshima Volcano]
Oshima Island was formed when the remains of three volcanic islands from hundreds of thousands of years ago (called Okada Volcano, Gyoja no Ikura Volcano, and Fudeshima Volcano after the present-day names of the places) were covered by the ejecta of the Oshima Volcano, which later formed an island. Oshima Volcano's eruptions above sea level began tens of thousands of years ago, and since about 20,000 years ago, it has had several hundred giant eruptions every 100 to 200 years from its central crater, which was located where Miharayama was located.

*Some of the terminology that refers to "Okada Volcano" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…島の北部には大島空港(1955年開設)があって,羽田から1日3往復の空の便がある。【大村 肇】
[大島火山]
 大島は数十万年前の三つの火山島の残骸(現在の地名をとり岡田火山,行者の窟火山,筆島火山と呼ぶ)を,その後生じた大島火山の噴出物が覆って一つの島となったものである。大島火山の海面上での噴火は数万年前に始まり,約2万年前以降は三原山の位置にあった中心火口から100年ないし200年ごとに巨大噴火を百数十回繰り返している。…

※「岡田火山」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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