Details of the Abstract
| Title of paper | Three-Dimensional Inversion of Time-Domain Electromagnetic Data Using Various Loop Source Configurations |
| List of authors | Yajun Liu, Xiangyun Hu, Pritam Yogeshwar, Ronghua Peng, Bo Han, Barbara Blanco-Arrué |
| Affiliation(s) | Badong National Observation and Research Station of Geohazards, China University of Geosciences, Wuhan; The School of Geophysics and Geomatics, China University of Geosciences, Wuhan; Institute of Geophysics and Meteorology, University of Cologne; Leibniz Institute for Applied Geophysics |
| Summary | We present a multi-dimensional inversion methodology for loop source time-domain electromagnetic data. The developed algorithm is a robust, efficient, and user-oriented tool for the multi-dimensional inversion of typical loop source time-domain electromagnetic configurations. A time-domain finite volume method and a direct solver are utilized for solving the 3D forward problem, while the iterative Gauss-Newton optimization method is implemented for the inversion kernel. The code is parallelized for calculating multiple sources simultaneously to accelerate the inversion. Based on different exploration tasks, we present three different inversion experiments on typical field scales for commonly used loop source TEM configurations. These examples verify the effectiveness and benchmark the developed 3D algorithm. Considering that TEM data is often gathered along profiles, we carried out an analysis using the 3D inversion algorithm for 2D data by adjusting the model roughness along the different domain directions, which seem to sufficiently constrain but not over-regularize the model along the strike direction to retrieve the true model structure. Besides using the vertical signal component for large scale moving and fixed loop configurations, the horizontal components are also included in the 3D inversion. The inversion algorithm is further verified with dense boat-towed central loop TEM data recorded on a volcanic lake on the Azores, Portugal. The reconstructed model is consistent along the profile line and the main features agree with the 1D stitched models. Moreover, the 3D model depicts additional reasonable features not visible in the 1D models. |
| Session Keyword | 2.0 EM theory, modelling and Inversion |
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2.0_three-dimensional_inversi_liu.pdf
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