/as then"euh sfear'/, n. Geol.
the region below the lithosphere, variously estimated as being from fifty to several hundred miles (eighty-five to several hundred kilometers) thick, in which the rock is less rigid than that above and below but rigid enough to transmit transverse seismic waves.
[1910-15; < Gk asthen(és) frail (see ASTHENIA) + -O- + -SPHERE]

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Zone of the Earth's mantle lying beneath the lithosphere, believed to be much hotter and more fluid than the lithosphere.

The asthenosphere is thought to extend from about 60 mi (100 km) to about 450 mi (700 km) below the Earth's surface.

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Universalium. 2010.

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  • asthénosphère — [ astenɔsfɛr ] n. f. • 1914; gr. astheneia « faiblesse » et sphère ♦ Géol. Couche non rigide du manteau supérieur de la Terre (entre 150 et 700 km de profondeur) sur laquelle flotte la lithosphère. ● asthénosphère nom féminin Zone située à l… …   Encyclopédie Universelle

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  • asthenosphere — (n.) layer of the Earth s upper mantle, 1914, from Gk. asthenos (see ASTHENIA (Cf. asthenia)) + SPHERE (Cf. sphere) …   Etymology dictionary

  • asthenosphere — [as then′ə sfir΄] n. [< Gr asthenēs, weak (see ASTHENIA) + O + SPHERE] a zone in the upper mantle of the earth, consisting of hot, plastic rock, that underlies the solid lithosphere …   English World dictionary

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  • asthenosphere — noun Etymology: Greek asthenēs weak + English o + sphere Date: 1914 a zone of a celestial body (as the earth) which lies beneath the lithosphere and within which the material is believed to yield readily to persistent stresses • asthenospheric… …   New Collegiate Dictionary

  • asthenosphere — noun the zone of the Earths upper mantle, below the lithosphere …   Wiktionary

  • asthenosphere —   layer of rock in the mantle approximately 80km deep and at a temperature of 1400°C. Rocks here become much softer and more easily deformed than in the lithosphere above …   Geography glossary

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