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《Progress In Geophysics》 2004-03
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Methods for calculating sensitivities for 2.5-D transient electromagnetic inversion(Ⅰ)

XIONG Bin~1, LUO Yan-zhong~2, QIANG Jian-ke~2(1. School Info-physics and Geomatics Engineering, Central South University, Changsha 410083, China;2. Institute of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China)  
The inversion method consists of three key components: inversion algorithm, forward modeling, and sensitivity calculation. In the first part of this paper, we present a simple derivation for generating the Jacobian matrix of sensitivities required by 2.5 dimensional transient electromagnetic inversion. It is shown that sensitivities for any component of an electromagnetic field can be obtained by solving two boundary value problems which are identical (primal and auxiliary field) and by integrating the dot product of the primal and auxiliary electric fields over the considered cell of model. The results of calculation for some models and the analysis of accuracy of calculation are discussed in the second part of this paper.
【Fund】: 国家自然科学基金项目(40064001)资助.
【CateGory Index】: P631
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