Three-dimensional imaging of subsurface structures using resistivity data |
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Authors: | Myeong-Jong Yi Jung-Ho Kim Yoonho Song Seong-Jun Cho Seung-Hwan Chung Jung-Hee Suh |
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Institution: | Geoelectric Imaging Lab, Korea Institute of Geoscience and Mineral Resources, 30 Kajung-Dong, Yusung-Gu, Taejon 305-350, Korea, and;School of Civil, Urban &Geosystem Engineering, Seoul National University, San 56, Shillim-Dong, Kwanak-Gu, Seoul 151-742, Korea |
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Abstract: | We have developed a three-dimensional inverse scheme for carrying out DC resistivity surveys, incorporating complicated topography as well as arbitrary electrode arrays. The algorithm is based on the finite-element approximation to the forward problem, so that the effect of topographic variation on the resistivity data is effectively evaluated and incorporated in the inversion. Furthermore, we have enhanced the resolving power of the inversion using the active constraint balancing method. Numerical verifications show that a correct earth image can be derived even when complicated topographic variation exists. By inverting the real field data acquired at a site for an underground sewage disposal plant, we obtained a reasonable image of the subsurface structures, which correlates well with the surface geology and drill log data. |
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