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Progress of forward computation in transient electromagnetic method

LI Jian-hui1,2,ZHU Zi-qiang2,ZENG Si-hong1,LIU Shu-cai3 (1.Institute of Geophysics and Geometics,China University of Geoscience,Wuhan 430074,China; 2.School of Earth Sciences & Info-physics,Central South University,Changsha 410083,China; 3.School of Resource & Geoscience,China University of Mining & Technology,Xuzhou 221116,China)  
In this paper,the method,current situation and development tendency of TEM forward computation were introduced in detail.Electromagnetic field is transformed from frequency domain to time domain in 1D TEM forward computation.Gaver-Stehfest algorithm,cosine transform and Guptasarma algorithm are three transform methods.Among these three methods,Gaver-Stehfest algorithm and cosine transform are used mostly.Gaver-Stehfest algorithm is faster than cosine transform,and is less accuracy than cosine transform.Numerical simulation of TEM focuses on 2.5D and 3D,using integral equation method(IEM),finite difference method(FDM),finite element method(FEM) and SLDM.IEM,mainly in the use of 3D numerical simulation,has been used very little.At present,FDM and FEM are primary methods in 2.5D and 3D TEM numerical simulation.SLDM is mainly used in 3D numerical simulation.In China,some influential results of forward computation of transient electromagnetic field excited by loop source have been obtained,for example,1D numerical computation by G-S algorithm,and 2.5D and 3D numerical simulation by FEM.Improving numerical algorithm,enhancing efficiency of computing,and studying the impact of terrain on transient electromagnetic field are three development tendencies of TEM forward computation.
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