3D finite-difference modeling algorithm and anomaly features of ZTEM |
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| Authors: | Tao Wang Han-Dong Tan Zhi-Qiang Li Kun-Peng Wang Zhi-Ming Hu Xing-Dong Zhang |
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| Institution: | 1.Key Laboratory of Geo-detection Ministry of Education and School of Geophysics and Information Technology,China University of Geosciences,Beijing,China |
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| Abstract: | The Z-Axis tipper electromagnetic (ZTEM) technique is based on a frequency-domain airborne electromagnetic system that measures the natural magnetic field. A survey area was divided into several blocks by using the Maxwell’s equations, and the magnetic components at the center of each edge of the grid cell are evaluated by applying the staggered-grid finite-difference method. The tipper and its divergence are derived to complete the 3D ZTEM forward modeling algorithm. A synthetic model is then used to compare the responses with those of 2D finite-element forward modeling to verify the accuracy of the algorithm. ZTEM offers high horizontal resolution to both simple and complex distributions of conductivity. This work is the theoretical foundation for the interpretation of ZTEM data and the study of 3D ZTEM inversion. |
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