Interpretation of static-shifted 2D MT data observed in Jeju island using 3D inversion (Space, Aeronautical and navigational electronics: 第9回地下電磁計測ワークショップ)

概要

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Interpretation of three-dimensional (3D) complications with two-dimensional (2D) inversion easily produces spurious structures or unrealistic anomalies beneath the profile. Besides, traditional 2D interpretation utilizes only TM-mode data because TE-mode data are more easily distorted by possibly existing 3D anomalies. To reduce contamination due to off-profile 3D anomalies, and so to utilize the TE-mode data in the interpretation, a 3D inversion algorithm can be applied to 2D MT data along a single profile. In this study, we conduct 2D and 3D inversions of MT data observed along two lines in Jeju Island. After inverting MT data in the TM and TE modes, respectively, we perform both 2D-joint and 3D inversion of both TM- and TE-mode data. Even though resistivity images derived from all of the four methods demonstrate that the geoelectrical structure in Jeju Island is a three-layered earth with the resistive-conductive-resistive stratigraphy, a reconstructed image derived from 3D inversion gives a most reasonable feature beneath a 2D profile.
社団法人電子情報通信学会の論文
2007-10-18