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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Vai Lahi ： ウィキペディア英語版 Vai Lahi Vai Lahi (''Tongan: Big water'') is the central crater lake of the Tongan island of Niuafoou. The island is the most northerly island of Tonga, is the most northerly island in the kingdom of Tonga, and is located some 570 km north of the kingdom's main island, Tongatapu. Niuafoou is annular in shape, the rim of an active volcano. The island ring encloses two large lakes, Vai Lahi and the much smaller Vai Sii (also known as Vai Mataaho), plus some eight much smaller ponds.〔Kempe, S., and Kasmierczak, J., "Terrestrial analogues for early planetary oceans - 5. The caldera lakes of Niuafoou", in Hanslmeier, A., Kempe, S., and Seckbac, J., (eds.) (2012) ''(Life on Earth and other Planetary Bodies )'' New York: Dordrecht.〕 Vai Lahi is a roughly circular crater lake with a diameter of 4 kilometres. Its surface, reported as 23 metres above sea level in 1935, is now believed to be close to sea level. The same survey which reported these new findings also discovered that the depth of the lake is considerably greater than previously thought; long thought to reach a maximum of 84 metres, it has recently been found to be 121 metres deep at its deepest point.〔 The lake has a perimeter of 15.5 kilometres, and a surface area of . Vai Lahi has a volume of almost one cubic kilometre.〔 The waters of the lake are warm and mildly alkaline. The lake contains three islands and a submerged island that appears when the water level drops. The largest of these islands is the central Motu Lahi (''Big island''). The other islands are Motu Molemole, Motu Sii, and the ephemeral Motu AAli. Niuafoou has been sporadically active throughout recorded history, with six eruptions during the twentieth century. The most violent of these, in 1946, resulted in the evacuation of the island (the first groups of inhabitants were allowed to return to the island in 1958). ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Vai Lahi」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.