A new computation method for a staggered grid of 3D EM field conservative modeling
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- Fomenko Elena Yu.
- Geoelectromagnetic Research Institute RAS
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- Mogi Toru
- Institute of Seismology and Volcanology, Hokkaido University
書誌事項
- タイトル別名
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- new computation method for a staggered grid of 3D EM field conservative modeling
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A new three-dimensional (3D) MT modeling scheme conserving electric current and magnetic flux is developed. The scheme is based on finite difference (FD) staggered rectangular non-uniform grid formulation for the secondary electric field with continuous components of tangential electric and normal magnetic fields, in contrast to existing FD algorithms with a discontinuous E-field at the face of the cells. The scheme leads to a sparse 13-band complex symmetrical system of linear equations, which is effectively solved by fast and stable conjugate gradient (CG) methods. The preconditioning procedure was used to decrease the condition of a number of an ill-conditioned matrix system by several orders and stably and quickly solves the matrix system. The special module for the correction of divergence-free current J greatly increased the speed of convergence and accuracy, especially at low frequencies and for high-contrast resistivity or conductivity structures. A special procedure was developed to improve the accuracy of tangential magnetic and vertical electrical components at the Earth's surface and at the interface with a large conductivity contrast. The validity of the new algorithm was demonstrated for difficult models with high-contrast resistivity structures including topography and for COMMEMI project models.
収録刊行物
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- Earth, Planets and Space
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Earth, Planets and Space 54 (5), 499-509, 2002
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会
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詳細情報 詳細情報について
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- CRID
- 1390001206514121088
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- NII論文ID
- 10008600258
- 130003780901
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- NII書誌ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL書誌ID
- 6166216
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
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