Currently, AEM data interpretation is mainly focused on 1D isotropic imaging and inversions. Because the AEM systems have a small footprint, so in many cases, an isotropic layered earth is a good approximation to the geophysical reality. However, if there are some small 3D structure in the footprint or the earth is anisotropic, the isotropic layered model is not suitable for explaining the data obtained in these area. The purpose of this research is to provide more information for the ATEM data interpretation. For doing this, we developed a 3D anisotropic inversion algorithm for ATEM data. This anisotropic inversion can be used to recover the resistivity in three directions. We use both the anisotropic and isotropic inversion to invert synthetic data and field data, the result shows that the anisotropic inversion has its inherent advantages and disadvantages. If we want to obtain reasonable explanation, we should refer both anisotropic and isotropic inversion result.


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