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Apparent anisotropy derived from transient electromagnetic Earth responses

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Abstract

1D Earth electromagnetic responses to a transient source are shown to be greatly dependent on resistivity anisotropy. Isotropic inversion of synthetic data arising from an anisotropic model leads either to misleading results (incorrect target depth and poor accuracy in recovered resistivities for target and background) or to non‐convergence. It is shown that when the correct anisotropy is included in inversion schemes the resulting model is well resolved. A practical method for obtaining a starting value of anisotropy through a newly defined apparent anisotropy is proposed.