Journal of Jilin University(Earth Science Edition) ›› 2017, Vol. 47 ›› Issue (1): 215-223.doi: 10.13278/j.cnki.jjuese.201701301

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Magnetotelluric Responses of Two-Dimensional Complex Conductivity Structures

Luo Tianya1, Xiong Bin1, Cai Hongzhu2, Chen Xin1, Liu Yunlong1, Lan Huaikang1, Li Zuqiang1, Liang Zhuo1   

  1. 1. College of Earth Sciences, Guilin University of Technology, Guilin 541006, Guangxi, China;
    2. College of Mines & Earth Sciences, University of Utah, Salt Lake City 84112, UT, USA
  • Received:2016-05-08 Online:2017-01-26 Published:2017-01-26
  • Supported by:
    Supported byNational Natural Science Foundation of China (40974077,41164004, 41674075), Natural Science Foundation of Guangxi Province (2016GXNSFA380004, 2013GXNSFAA019277), Lijiang Scholars Special Expenditure Grant (2013005)and Innovation Project of GLUT Graduate Education (BS201601)

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Abstract: To improve the discretization technique, adaptive unstructured quadrilateral grid finite element (FE) procedure is presented for solving weighted residual formulation of magnetotelluric (MT) fields in 2-D conductivity structures. The finer the meshes are, the more accurate the numerical solutions are. However, this is at the cost of time-consuming and large memory requirement. Adaptive mesh refinement generally provides an optimization of both run time and accuracy since in the method meshes are only refined where the electrical parameters vary intensely, while coarsen in the slow electrical resistivity change region. Due to the fact that regular grids have no potential to incorporate arbitrary topography and complex geologic structures, we introduced COMSOL Multiphysics software package to build arbitrary geometries and subdivide them with free quadrilaterals, then apply meshes information to our algorithm. Comparison with analytical solutions and previous numerical solutions demonstrate a high-accuracy and flexibility of numerical simulations based on unstructured grid, a new technology to discretize the computating domain.

Key words: unstructured grid, magnetotelluric(MT), finite element method, forward

CLC Number: 

  • P631.3
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