Three-dimensional inversion of controlled-source audio-frequency magnetotelluric data based on unstructured fi nite-element method

作     者：Chen Xiang-Zhong Liu Yun-He Yin Chang-Chun Qiu Chang-Kai Zhang Jie Ren Xiu-Yan Zhang Bo Chen Xiang-Zhong;Liu Yun-He;Yin Chang-Chun;Qiu Chang-Kai;Zhang Jie;Ren Xiu-Yan;Zhang Bo

作者机构：College of Geo-exploration Science and TechnologyJilin UniversityChangchunJilinChina Development and Research CenterChina Geological SurveyBeijingChina. 

基　　金：the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA14020102) the National Natural Science Foundation of China(Nos.41774125,41530320,41904104) the Key National Research Project of China(No.2018YFC0603300) the S&T Program of Beijing(No.Z181100005718001) 

出 版 物：《Applied Geophysics》 (应用地球物理（英文版）)

年 卷 期：2020年第17卷第3期

页      码：349-360页

摘      要：We propose a new 3D inversion scheme to invert the near-and transition-zone data of CSAMT with topography *** this new method,the earth was discretized into unstructured tetrahedra to fit the ragged topography and the vector fi nite-element method was adopted to obtain precise responses and good *** simulate the attitude and shape of the transmitter,we divided a long-grounded transmitter into dipoles and integrated these dipoles to obtain good responses in the near-and transition-fi eld ***,we designed an L2 norm-based objective functional and applied a standard quasi-Newton method as the optimization method to solve the inverse problem and guarantee steady *** tested our 3D inversion method first on synthetic data and then on a field dataset acquired from select sites near Changbai Mountain,*** both tests,the new inversion algorithm achieved excellent fitting between the predicted and observed data,even in near-and transition-fi eld zones,and the inversion results agreed well with the true *** fi ndings reveal that the proposed algorithm is eff ective for 3D inversion of CSAMT data.

主 题 词：CSAMT 3D inversion topography unstructured grids fi nite-element 

学科分类：081801[081801] 081802[081802] 08[工学] 0818[工学-交通运输类] 

核心收录：

D　O　I：10.1007/s11770-020-0812-z

馆 藏 号：203994145...