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Published December 1986 | Published
Journal Article Open

Strong anisotropic flow in a finely layered asthenosphere

Honda, Satoru

Abstract

We derive the long wave length equivalents of the constitutive relations for finely stratified fluids as suggested by Saito and Abe [1984]. The results show the transversely isotropic relations characterized by two effective viscosities. One is associated with shear stress applied on the plane parallel to the layering and the other is with normal stress applied perpendicular to the layering. If thin soft layers exist in the low velocity zone, there may be a significant difference in these two viscosities. A simple calculation simulating mantle flow with large apparent anisotropy shows the possible existence of convection having large aspect ratio.

Additional Information

© 1986 American Geophysical Union. Paper number 6L7044. Received September 2, 1986; accepted September 26, 1986. This work was stimulated by the suggestions of Saito and Abe [1984]. Don L. Anderson and Tashiro Tanimoto read the early stage of manuscript. Dave Scott and Caltech Japanese Mafia (Kiyoshi Yomogida and Hitoshi Kawakatsu) gave me useful comments. Contribution No. 4381 of the Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, California 91125.

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