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Effects of 3D Topography on Magnetotelluric Responses  

Nam, Myung-Jin (Department of Petroleum and Geosystems Engineering, The University of Texas at Austin, Groundwater and Geothermal Division, Korea Institute of Geoscience and Mineral Resources)
Kim, Hee-Joon (Department of Environmental Exploration Engineering, Pukyong National University)
Song, Yoon-Ho (Groundwater and Geothermal Division,, Korea Institute of Geoscience and Mineral Resources)
Lee, Tae-Jong (Groundwater and Geothermal Division,, Korea Institute of Geoscience and Mineral Resources)
Suh, Jung-Hee (Department of Civil, Urban and Geosystem Engineering, Seoul National University)
Publication Information
Geophysics and Geophysical Exploration / v.10, no.4, 2007 , pp. 275-284 More about this Journal
Abstract
For precise interpretation of magnetotelluric (MT) data distorted by irregular surface terrain, topography effects are investigated by computing apparent resistivities, phases, tippers and induction vectors for a three-dimensional (3D) hill-and-valley model. To compute MT responses for the 3D surface topography model, we use a 3D MT modeling algorithm based on an edge finite-element method which is free from vector parasites. Distortions on the apparent resistivity and phase are mainly caused by distorted currents that flow along surface topography. The distribution of tipper amplitudes over both hill and valley are the same, while the tipper points toward the center of hill and the base of the valley. The real part of induction vector also points in the same direction as that of tipper, while the imaginary part in the opposite direction.
Keywords
3D; edge finite element method; MT; modeling; topographic effect;
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Times Cited By KSCI : 4  (Citation Analysis)
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