gja (English spelling) gja

Japanese: gjá(英語表記)gja
gja (English spelling) gja

...It is a volcanic island whose northern side borders the Arctic Circle and its area is 1.24 times that of Hokkaido.
[Nature]
The island is a rare example of the Mid-Atlantic Ridge that has emerged above sea level, and the central tectonic zone is home to many lava-producing fissures (gjá), volcanoes, fumaroles, hot springs, and earthquakes. The land on the east and west sides of this border moves away from each other by an average of 1cm per year, making it a model site for the ocean floor spreading theory. In January 1973, a northeast-southwest-trending fissure suddenly appeared in the middle of the night on the eastern side of Heimaey Island, off the southern coast, and volcanic blocks and lava flowed out, forcing the 5,200 residents to temporarily evacuate to the mainland.

*Some of the terminology explanations that mention "gjá" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…北側が北極圏に接する火山島で,面積は北海道の1.24倍である。
[自然]
 島は大西洋中央海嶺が珍しく海面上に現れたもので,中央構造帯には溶岩を出す割れ目(ギャウgjá),火山,噴気,温泉,地震などが多く,これを境に東・西の土地は年平均約1cmずつ離れており,海洋底拡大説の標式地である。1973年1月南沖のヘイマエイ島東部に夜半突如として北東~南西方向の割れ目が生じ,噴石ついで溶岩が流れ出したため,住民5200人が一時本土に避難した。…

※「gjá」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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