plunge

Japanese: plunge
plunge

...The plane that contains all the hinge lines of the multiple folds that make up a single fold is called the fold axis plane (hinge plane) or simply the fold axis plane. If the fold axis is inclined, the angle between the axis and the horizontal plane is called the plunge. For the analysis of fold structures, the fold axis and fold axis plane are the most basic geometric elements, but for the aforementioned oil exploration, terms related to this are also used, since oil is lighter than water and tends to accumulate in the highest parts.

*Some terminology explanations that mention "plunge" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…一つの褶曲を構成する複数の褶曲面のヒンジ線をすべて含む面を褶曲軸面(ヒンジ面)ないし単に軸面と呼ぶ。褶曲軸が傾斜している場合,軸と水平面とのなす角をプランジplungeと呼ぶ。褶曲構造の解析にとって,褶曲軸や軸面は最も基本的な幾何学的要素であるが,前述の石油探鉱にとっては,石油は水より軽いのでいちばん高い部分にたまりやすいことから,これに関連した術語も使われている。…

※「plunge」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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