Three-dimensional interpretation of sparse survey line MT data: Synthetic examples*
Lin Chang-Hong1,2,3, Tan Han-Dong1,2,3, Shu Qing4, Tong Tuo1,2,3, and Zhang Yu-Mei5
1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing, 100083, China.
2. Key Laboratory of Geo-detection (China University of Geosciences), Ministry of Education, Beijing, 100083, China.
3. School of Geophysics and Information Technology,China University of Geosciences, Beijing, 100083, China.
4. China Aero Geophysical Survey & Remote Sensing Center for Land and Resources, Beijing, 100083, China.
5. No.812 Geological Party of East China Metallurgical Geology and Exploration Bureau, Tongling, 244008, China.
Abstract Currently, most of MT (magnetotelluric) data are still collected on sparse survey lines and interpreted using 2D inversion methods because of the fi eld work cost, the work area environment, and so on. However, there are some 2D interpretation limitations of the MT data from 3D geoelectrical structures which always leads to wrong geological interpretations. In this paper, we used the 3D inversion method to interpret the MT sparse lines data. In model testing, the sparse lines data are the MT full information data generated from a test model and processed using the 3D conjugate gradients inversion code. The inversion results show that this inversion method is reasonable and effective. Meanwhile, we prove that for inversion results with different element parameters, the results by joint inversion of both the impedance tensor data and the tipper data are more accurate and closer to the test model.
This work is jointly supported by the National Hi-Tech Research and Development Program of China (863 Program) (No.2007AA09Z310), National Natural Science Foundation of China (No. 40677037, 40774029, 41004028), the Fundamental Research Funds for the Central Universities (No. 2010ZY53), and the Program for New Century Excellent Talents in University (NCET).
Cite this article:
LIN Chang-Hong,TAN Han-Dong,SHU Qing et al. Three-dimensional interpretation of sparse survey line MT data: Synthetic examples*[J]. APPLIED GEOPHYSICS, 2012, 9(1): 9-18.
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