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Lehmann discontinuity : ウィキペディア英語版
Lehmann discontinuity

__NOTOC__
The Lehmann discontinuity is an abrupt increase of ''P''-wave and ''S''-wave velocities at the depth of 220±30 km, discovered by seismologist Inge Lehmann.〔The thickness is 220 km.
〕 It appears beneath continents, but not usually beneath oceans,〔
〕 and does not readily appear in globally averaged studies. Several explanations have been proposed: a lower limit to the pliable asthenosphere, a phase transition,〔
〕 and most plausibly, depth variation in the shear wave anisotropy.〔

〕 Further discussion of the Lehmann discontinuity can be found in the book ''Deformation of Earth Materials'' by Shun-ichirō Karato.〔


==Notes==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Lehmann discontinuity」の詳細全文を読む



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