Magnetotelluric response of laterally inhomogeneous and anisotropic media
Magnetotelluric response of laterally inhomogeneous and anisotropic media
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DOI：
10.1190/1.1440579
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发表时间：
1975-12
期刊：
影响因子：
3.3
通讯作者：
I. Reddy;D. Rankin
中科院分区：
文献类型：
--
作者：
I. Reddy;D. Rankin
大地电磁测量结果与基于二维模型计算的各向异性或横向非均匀性计算结果之间缺乏一致性，因此需要建立比以前考虑的更复杂的地球模型。将伽辽金有限元法应用于具有张量电导率的二维结构。考虑电导率作为张量的重要性由嵌入各向异性半空间的各向异性导电脉组成的模型来说明。该模型可以通过阻抗张量的不消失对角线元素、椭圆度指标和偏度来区别于各向同性模型。
The lack of agreement between magnetotelluric field measurements and the calculations based on essentially two‐dimensional models with either anisotropy or lateral inhomogeneity necessitates a more complex model of the earth than has been previously considered. The Galerkin finite‐element method is applied to a two‐dimensional structure with a tensor conductivity. The importance of considering conductivity as a tensor is illustrated by a model consisting of an anisotropic, conducting dike embedded in an anisotropic half‐space. This model can be distinguished from an isotropic model by the nonvanishing diagonal elements of the impedance tensor, the ellipticity indices, and the skew.