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Global 3-D electromagnetic forward modelling: a benchmark study

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  • Global electromagnetic (EM) induction studies have been the focus of increasing attention during the past few years. A primary stimulus for this interest has been increased quality, coverage and variety of the newly available data sets especially from recent low-Earth-orbiting satellite missions. The combination of traditional ground-based data with satellite-borne measurements presents intriguing opportunity to attack the most challenging problem of deep EM studies: the recovery of 3-D variations of electrical conductivity in the Earth’s mantle. But the reliable inference of deep-Earth electrical properties depends on the accuracy and efficiency of the underlying forward modelling solutions used to model 3-D electromagnetic induction in a heterogeneous sphere. Several 3-D forward solvers have been proposed over the last decade, which are based on staggered-grid finite difference, integral equation, finite element and spherical harmonic-finite element approaches. However, there has been no systematic intercomparison amongst the solvers. The goal of this paper is to conduct such a study in order to explore the relative merits of the different approaches when confronted with a set of synthetic models designed to probe the numerical accuracy of each. The results of the intercomparison are presented along with performance metrics to help assess the computational costs associated with each solution.
  • This is the publisher’s final pdf. The published article is copyrighted by the author(s) and published by Oxford University Press on behalf of the Royal Astronomical Society. The published article can be found at: http://gji.oxfordjournals.org/.
  • Keywords: Numerical approximations and analysis, Non-linear electromagnetics, Geomagnetic induction, Composition of the mantle, Numerical solutions
  • Keywords: Numerical approximations and analysis, Non-linear electromagnetics, Geomagnetic induction, Composition of the mantle, Numerical solutions
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  • Anna Kelbert, Alexey Kuvshinov, Jakub Velímský, Takao Koyama, Joseph Ribaudo, Jin Sun, Zdeněk Martinec, Chester J. Weiss; Global 3-D electromagnetic forward modelling: a benchmark study, Geophysical Journal International, Volume 197, Issue 2, 1 May 2014, Pages 785–814, https://doi.org/10.1093/gji/ggu028
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  • 197
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  • 2
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  • Kelbert acknowledges the support of NASA grant NNX08AG04G. Kuvshinov acknowledges the support of Russian Foundation for Basic Research under grant No. 13-05-12111. Ribaudo acknowledges the support of Scripps Institution of Oceanography, and NASA Headquarters under the NASA Earth and Space Science Fellowship Program – Grant NNX07AQ94H. Velimsky acknowledges the support of the Grant Agency of Czech Republic, Project No. P210/11/1366.
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