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Two-dimensional Modeling and Inversion of MT Data Including Topography  

Lee Seong Kon (Geophysical Exploration and Mining Division, Korea Institute of Geoscience and Mineral Resource)
Song Yoonho (Geophysical Exploration and Mining Division, Korea Institute of Geoscience and Mineral Resource)
Kim Jung-Ho (Geophysical Exploration and Mining Division, Korea Institute of Geoscience and Mineral Resource)
Chung Seung-Hwan (Geophysical Exploration and Mining Division, Korea Institute of Geoscience and Mineral Resource)
Publication Information
Geophysics and Geophysical Exploration / v.5, no.4, 2002 , pp. 291-298 More about this Journal
Abstract
We have developed a two-dimensional (2-D) magnetotelluric (MT) inversion algorithm, which can include topographic effects in inversion. We use the finite element method (FEM) to incorporate topography into forward calculation. Topography is implemented simply by moving nodes of rectangular elements in z-direction according to the elevation of air-earth interface. In the inversion process, we adopt a spatially variable Lagrangian multiplier algorithm in the smoothness-constrained least-squares inversion. The inversion algorithm developed in this study reconstructs subsurface resistivity structure quite well when topography variation exists. Also, it turns out to be effective in both resolution and stability from a model study and field data application.
Keywords
MT; topography; inversion; modeling; FEM; 2-D;
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1 송윤호, 조인기, 정승환, 김정호, 전정수, 1993, 2차원 MT 탐사-EMAP 탐사 : 전기, 전자탐사 연구 KR-93-1G-7, 한국자원연구소, 37-86
2 Yi, M.J., and Kim, J.H., 1998, Enhancing the resolving power of the least-squares inversion with active constraint balancing: 68th Ann. Internat. Mtg., Soc. ExpI. Geophys., Expanded Abstracts, 485-488
3 Rodi, W. L., 1976, A technique for improving the accuracy of finite element solutions for magnetotelluric data: Geophys. J. Roy. Astr. Soc., 44, 483-506
4 Sasaki, Y., 1989, Two-dimensional joint inversion of magnetotelluric and dipole-dipole resistivity data: Geophysics, 54, 254-262
5 조인기, 승윤호, 정승환, 김정호, 전정수, 1993, 원거리 기준점 MT 탐사: 전기, 전자탐사 연구 KR-93-1G-7, 한국자원연구소, 5-34
6 손정술, 1996, 유한요소법을 이용한 MT 탐사자료의 지형보정: 공학석사학위논문, 서울대학교
7 송윤호, 조인기 , 정승환, 김정호, 전정수, 1992, 제주도에서의 MT 탐사: 전기, 전자탐사 연구 KR-92-1G-5, 한국자원연구소, 33-69
8 신동훈, 2000, 지형효과를 고려한 2차원 지자기지전류 역산: 공학석사학위논문, 서울대학교
9 이성곤, 현병구, 정승환, 송윤호, 1994, 2차원 MT 모델링과 공간 필터링을 이용한 정적효과 제거에 관한 연구: 한국자원공학회지, 31, 444-456
10 김희준, 1990, 지자기 지전류 자료의 2차원 역산: 지질학회지, 26, 442-449
11 Wannamaker, P. E., Stodt, J. A., and Rijo, L., 1986, Two-dimen-sional topographic responses in magnetotellurics modeled using finite elements: Geophysics, 51, 2131-2144
12 정승환,오재호 외 16인, 1994, MT 및 DGS 탐사에 의한 경상분지내 지열 및 탄화수소 탐사: 한국자원연구소 KR-94(T)-18, 과학기술처
13 Morrison, H.F., and Nichols, E. A., 1996, Continuous impedance profiling for mineral exploration: 66th Ann. Internat. Mtg., Soc. Expl. Geophys., Expanded Abstracts, 1286-1289
14 Torres-Verdin, C., and Bostick, F. X. Jr., 1992, Principles of spatial surface electric field filtering in magnetotellurics: Electromagnetic array profiling (EMAP): Geophysics, 57, 603-622
15 Press, W. H., Teukolsky, S. A., Vetterling, W. T., and Flannery, B. P., 1992, Numerical recipes in FORTRAN: the art of scientific computing: Cambridge Univ. Press