Three-dimensional magnetotelluric regularized inversion based on smoothness-constrained model  

基于光滑约束模型的大地电磁三维正则化反演(英文)

作　　者：童孝忠[1,2] 柳建新[1] 郭荣文[1] 刘海飞[1] 龚露[1] 

机构地区：[1]中南大学地球科学与信息物理学院,长沙410083 [2]中南大学有色资源与地质灾害探查湖南省重点实验室,长沙410083

出　　处：《Transactions of Nonferrous Metals Society of China》2014年第2期509-513,共5页中国有色金属学报（英文版）

基　　金：Project(20110162120064)supported by Higher School Doctor Subject Special Scientific Research Foundation of China;Project(10JJ6059)supported by the Natural Science Foundation of Hunan Province,China

摘　　要：How to get the rapid and stable inversion results and reconstruct the clear subsurface resistivity structures is a focus problem in current magnetotelluric inversion. A stable solution of an ill-posed inverse problem was obtained by the regularization methods in which some desired structures were imposed to stabilize the inverse problem. By the smoothness-constrained model and approximate sensitivity method, the stable subsurface resistivity structures were reconstructed. The synthetic examples show that the smoothness-constrained regularized inversion method is effective and can be reasonable to reconstruct three-dimensional subsurface resistivity structures.如何得到快速稳定的反演结果和更清晰地重建地下电阻率结构等问题仍然是当前大地电磁反演研究的一个重点。在构制目标函数中采用正则化方法,使不适定反演问题具有稳定的反演结果,并改善解的稳定性和非唯一性;将光滑约束模型和近似灵敏度矩阵求解方法应用于反演过程中,快速稳定地构建地下电阻率结构。理论模型试算的结果表明光滑约束正则化反演方法是可行的,并能合理地重建地下三维电阻率结构。

关 键 词：MAGNETOTELLURIC regularized inversion approximate sensitivity smoothness-constrained model 

分 类 号：P631.3[天文地球—地质矿产勘探]