한국지구물리탐사학회:학술대회논문집

Korean Society of Earth and Exploration Geophysicists (한국지구물리·물리탐사학회)
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An efficient 3D inversion of magnetotelluric data

  • Han, Nu-Ree (Dept. of Civil, Urban and Geosystem Eng., Seoul National University) ;
  • Choi, Ji-Hyang (Dept. of Civil, Urban and Geosystem Eng., Seoul National University) ;
  • Nam, Myung-Jin (Dept. of Petroleum and Geosystems Eng., The University of Texas at Austin) ;
  • Kim, Hee-Joon (Dept. of Environmental Exploration Eng., Pukyung National University) ;
  • Lee, Tae-Jong (Groundwater & Geothermal Resources Div., KIGAM) ;
  • Song, Yoon-Ho (Groundwater & Geothermal Resources Div., KIGAM) ;
  • Suh, Jung-Hee (Deceased, Formerly Dept. of Civil, Urban and Geosystem Eng., Seoul National University)
  • Published : 2007.06.07
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Abstract

An efficient three-dimensional (3D) inversion of magnetotelluric (MT) data can be carried out by using approximate sensitivities or avoiding the calculation of a full sensitivity matrix. In this paper, we propose approximate sensitivities for efficient 3D MT inversion based on the Gauss-Newton method and test and compare four kinds of sensitivities. Applying the four sensitivities to both synthetic and field data shows that the effects of sensitivities are highly dependent on data and thus applying various combinations of sensitivities is recommended for efficient inversion and good images.

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