粘性率に異方性があるとどうなるか

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  • 斎藤 正徳
    東京大学理学部地球物理学教室 現所属: 神戸大学理学部地球科学教室
  • 阿部 豊
    東京大学理学部地球物理学教室

書誌事項

タイトル別名
  • Consequences of Anisotropic Viscosity in the Earth's Mantle
  • ネンセイリツ ニ イホウセイ ガ アル ト ドウ ナル カ

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抄録

The viscous relaxation spectra and the marginal stability curves of Rayleigh-Bénard convection in a transversely isotropic fluid were computed. An incompressible, transversely isotropic fluid is expressed in terms of two material constants, L and δ. L is the viscosity pertinent to the shear in the horizontal plane and δ is the anisotrpy factor. δ is likely to be very large in the mantle if thin less viscous (molten) layers are aligned in the horizontal plane. At large δ the relaxation spectra become nearly constant over a wide range of wavenumber and its magnitude is determined essentially by the product L·δ. The flattness is consistent to the observed relaxation spectra. A similar effect is found in the Rayleigh-Bénard convection; the marginal stability curve flattens out to small wavenumber at large δ. This implies a possibility of thin convection cells in the earth's mantle.

収録刊行物

  • 地震　第２輯

    地震　第２輯 37 (2), 237-245, 1984

    公益社団法人 日本地震学会

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