3. EM/GPR Imaging Technologies
On the Applicability of Two-dimensional MT Topographic Inversion in 3-D Topography Environment
Seong Kon Lee, Myeong-Jin Nam, Tae Jong Lee and Yoonho Song
Korea Institute of Geoscience and Mineral Resources (KIGAM), Korea.
Abstract
We investigated the applicability and limitations of two-dimensional (2-D) magnetotelluric (MT) topographic inversion in three-dimensional (3-D) topographic environment. For this purpose, we set up a 3-D model, which has a hill and a valley in 3-D shape with an 2-D like anomalous body. The anomalous body is located beneath the mid-point between a hill and a valley and longer in strike direction to assume that the responses are distorted mainly due to 3-D topographic structure. We tried to compare 2-D inversion results each other in various cases, i.e., 1) 2-D non-topographic inversion of data distorted by 3-D topography, 2) 2-D topographic inversion of data affected by 3-D topography, 3) 2-D non-topographic inversion of data which are corrected by 3-D modeling algorithm. From these results, we present experimental rule how well 2-D topographic inversion works.
Last modified: Fri May 12 19:16:36 2006