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| | Abstract | | In the MT method, the underground resistivity structure has been estimated from the characteristics of the MT response function that changes with frequency. Furthermore, the analysis using the rotation invariant (Zssq) of the impedance is progressing in order to reduce the influence of the resistivity anomaly near the ground surface. However, the spatial distribution characteristics of Zssq have not been discussed. In this study, the spatial distribution of the apparent resistivity and phase of Zssq obtained by the numerical calculation in the two-dimensional underground resistivity model was obtained and the characteristics were quantified. Here, the spatial correlation of MT response functions was investigated using the geostatistical variogram. When the range of the variogram and the spatial wavelength are compared in advance, the range tends to be about 1.5 to 4.5 times the spatial wavelength, and the spatial wavelength can be calculated from the variogram of the MT response function. As a result, a gradual positive correlation was observed between the apparent resistivity and the spatial wavelength of the phase. Focusing on the similarity of the spatial distributions of the two, we verified whether the static shift can be discussed. |
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