Fig. 24From: Use of ssq rotational invariant of magnetotelluric impedances for estimating informative properties for galvanic distortion a Average det (diamonds) and ssq (squares) impedances from the dataset distorted under the PIM model, where the elements of the perturbation matrix \(\mathbf {D}\) are normally distributed random numbers with an SD of 0.5. They are shown in comparison with the undistorted 1D response (black solid line), which is as shown in Fig. 2b. b Local distortion indicators from this datasetBack to article page