| 释义 |
asthenosphere Geol.|æsˈθɛnəʊsfɪə(r)|
[f. Gr. ἀσθεν-ής weak (f. Gr. ἀ- priv. + σθένος strength) + -o + sphere n.]
(See quot. 1914.)
1914J. Barrell in Jrnl. Geol. XXII. 659 The theory of isostasy shows that below the lithosphere there exists in contradistinction a thick earth-shell marked by a capacity to yield readily to long-enduring strains of limited magnitude... Its comparative weakness..is its distinctive feature. It may then be called the sphere of weakness—the asthenosphere. 1915Ibid. XXIII. 43 The weakest part of the asthenosphere is of the order of one-hundredth of the maximum strength of the lithosphere. 1922Encycl. Brit. XXXI. 214/1 A yielding but not necessarily molten layer, Barrell's asthenosphere..which lies some 80 to 100 m...below the general surface of the geoid. 1966New Scientist 10 Mar. 635/1 The seat of crustal upheavals may be the so-called ‘asthenosphere’ or low-velocity layer in the Earth's upper mantle. |