1-D Interpretation of Anisotropic MT Data

The importance of anisotropic resistivity in MT interpretation has been pointed out several years ago by Cantwell (1960), Bostick and Smith (1962), Mann (1965) and many others. In fact, magnetotelluric field data frequently exhibit anisotropic behaviour. These anisotropies may arise due to crystal anisotropies of minerals or when regular bending of rocks with different resistivities results in an apparent anisotropy (Keller and Frishknecht, 1966). Anisotropic phenomena have been reported by several workers: Rankin and Reddy (1969), Rasmussen (1988) and more recently by Senechal et al. (1996) and A. Adam (1996).