Pratt, JH

Japanese: Pratt,J.H.(英語表記)PrattJH
Pratt, JH

...In modern terms, the idea is that the crust floats on the mantle. In contrast, J.H. Pratt (1811-71) believed that the density of the material that makes up high mountains is lower than that of the material that makes up low mountains, and that the depth of the interface between the mountain body and the material that keeps it floating is constant everywhere (Figure 1). Today, based on knowledge gained from the propagation of seismic waves and experiments with artificial earthquakes, Airy's model is closer to reality.

*Some of the terminology that mentions "Pratt, JH" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…現代的な言い方をすれば,地殻はマントルの上に浮いているという考え方である。これに対してプラットJ.H.Pratt(1811‐71)は,高い山を構成する物質の密度は低い山を構成する物質の密度にくらべて小さく,山体とそれを浮かせている物質との境界面の深さはどこでも一定と考えた(図1)。今日,地震波の伝わり方や人工地震の実験から得られる知見によれば,エアリーのモデルが実際の姿に近い。…

※「Pratt,J.H.」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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