hinge

Japanese: hinge
hinge

...It is often a target for mineral exploration.
[Terminology for single folds]
In a single fold cross section, the point where the curvature of the fold surface is maximum is called the hinge, and the line connecting the hinges is called the hinge line or fold axis (Figure 2). The parts of the hinge with smaller curvature on either side are called the wings or legs, and the point where the curvature is zero is called the inflection point.

*Some of the terminology that mentions "hinge" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…しばしば探鉱の目標とされる。
[単一の褶曲に関する術語]
 単一の褶曲断面において,褶曲面の曲率が最大になる点をヒンジhingeといい,ヒンジを結んでできる線をヒンジ線または褶曲軸という(図2)。ヒンジの両側の曲率の小さい部分を翼または脚といい,曲率0の点を変曲点という。…

※「hinge」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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