…The depth distribution of density, pressure, gravity, and elastic constants in the mantle was estimated by Brun Ke Bullen in 1940. According to his division into B layer (from the Moho to a depth of 413 km), C layer (413-984 km) and D layer (984 km to the mantle-core boundary), the area up to a depth of 400 km is often called the upper mantle, the area 400-900 km is called the transition layer, and the area deeper than 900 km is called the lower mantle. Sometimes the mantle is simply divided into the upper mantle and the lower mantle, with the boundary between them being around a depth of 660 km. … *Some of the terminology that refers to the "lower mantle" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…マントル内の密度,圧力,重力,弾性定数の深さ分布は1940年ブレンK.E.Bullenによって推定された。彼による区分,B層(モホ面から深さ413kmまで),C層(深さ413~984km)およびD層(深さ984kmからマントル・核境界面まで)に従い,深さ400kmまでを上部マントル,400~900kmを遷移層,900km以深を下部マントルと呼ぶことが多い。なお,単に上部マントルと下部マントルに分け,その境界を深さ660km付近とすることもある。… ※「下部マントル」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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