3-D imaging of mantle conductivity based on inversion of satellite C-responses: Proof of concept

摘要：

Recently Kuvshinov et al. (2006) presented an approach to detect large-scale mantle conductivity anomalies by analysis of magnetic observations made by low-Earth-orbiting satellites. From the observations C-responses are estimated on a 2-D grid at a number of periods. Although the analysis of the C-responses gives an idea about the geometry of mantle anomalies, the recovery of responses is only a prerequisite for a retrieval of the 3-D distribution of conductivity. In this work we present a 3-D inversion scheme that solves this problem. It exploits a gradient type optimization method, along with a forward problem solver based on the integral equation approach. The dramatic saving in computations makes use of an adjoint approach to calculate efficiently gradients of misfit. In support of the efficient gradient calculation, formulas for magnetic Greens tensor have been derived. We test our 3-D inversion scheme by inverting C-responses calculated in a realistic 3-D conductivity model of the Earth.

关键词： Global induction studies mantle conductivity C-responses 3-D inversion

作者: KUVSHINOV Alexei SEMENOV Alexey PANKRATOV Oleg JACKSON Andrew OLSEN Nils

作者单位: Institute of Geophysics, ETH Zurich, Switzerland;Institute of Terrestrial Magnetism, Ionosphere and Institute of Geophysics, ETH Zurich, Switzerland Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Troitsk, Russia National Space Institute, DTU, Copenhagen, Denmark

会议类型: 国际会议

会议名称: The 19th International Workshop on Electromagnetic Induction in the Earth(第十九届国际地球电磁感应学术研讨会)

会议地点: 北京

会议语种:英文

页码: 630-635

在线出版日期: 2008-10-23（万方平台首次上网日期，不代表论文的发表时间）