A STUDY ON 2D MAGNETOTELLURIC SHARP BOUNDARY INVERSION

被引：16

作者：

Zhang Luo-Lei ^{[1
]}

Yu Peng ^{[1
]}

Wang Jia-Lin ^{[1
]}

Wu Jian-Sheng ^{[1
]}

Chen Xiao ^{[1
]}

Li Yang ^{[1
]}

机构：

[1] Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China

来源：

CHINESE JOURNAL OF GEOPHYSICS-CHINESE EDITION | 2010年 / 53卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Magnetotelluric (MT); Focusing inversion; Sharp boundary; Gradient support Conjugate Gradient (CG); SMOOTH; SENSITIVITIES; ALGORITHM; MODELS;

D O I：

10.3969/j.issn.0001-5733.2010.03.017

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

Sharp boundary inversion is a relatively difficult problem in magnetotelluric (MT) and other geophysical inversion, which has been studied by many researchers. We analyze the focusing inversion which is based on the minimum gradient support functional provided by Zhdanov, M. S. (2004), and introduce a diagonal gradient support into the objective function to improve the presentation of oblique geo-electrical interface. Certain models are designed to test this method in the paper. Compared with the results inversed by the focusing inversion without diagonal gradient support, the shape of oblique geo-electrical interface really displays better, this new algorithm is also proved to be stable and practical. Meanwhile, in order to improve the computing efficiency, reciprocity theorem is used to calculate sensitivity matrix, and regularized conjugate gradient method is introduced to solve the objective functional minimum.

引用

页码：631 / 637

页数：7

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