Inversion of anisotropic magnetotelluric data

A geophysical inversion procedure based on the generalized inversion of a matrix is presented and applied to anisotropic magnetotelluric data for one-dimensional models. Various computational aspects of the iterative process involved are discussed together with the use of the resolution matrix, information matrix and the eigenvalues and eigenvectors for establishing the global significance of the parameters and their relationship with the data. A starting anisotropic model is built gradually, the first stage consisting of two separated isotropic problems corresponding to the off-diagonal elements of the impedance-tensor. The examples given include an anisotropic model as well as a model having two anisotropic layers and an isotropic one.