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Modeling for the Effect of Magnetotelluric 3D Topography Based on the Vector Finite-Element Method

Gu Guanwen1, 2, Wu Wenli2, Li Tonglin1   

  1. 1.College of GeoExploration Science and Technology, Jilin University, Changchun130061, China;
    2.Institute of Geophysical and Geochemical Exploration, Langfang065000, Hebei, China
  • Received:2014-02-01 Online:2014-09-26 Published:2014-09-26

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Abstract:

It is of great significance to study the effect of topography to the magnetotelluric inversion and interpretation. A vector finite-element algorithm has been applied to simulate magnetotelluric (MT) effect of 3D topography models. First, the algorithm was verified by comparison with the modeling result of a 2D ridge model. Then, the effect of 3D topography was simulated for a 3D positive trapezoidal-hill model and a negative trapezoidal-hill model respectively. In addition, we also compared the results of 2D and 3D simulation. The results show that  Zxy and Zyx are both affected by the terrain, the difference between 2D TE mode and real 3D response is great, whereas the 2D TM mode response is similar to the real 3D response. If we invert the 3D MT data by a 2D program with terrain, the TM polarization mode inversion is more reasonable.

Key words: magnetotelluric, 3D terrain, numerical modeling, vector-finite-element

CLC Number: 

  • P631.3
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