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
Bibliographic Information
- Other Title
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- new computation method for a staggered grid of 3D EM field conservative modeling
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Abstract
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.
Journal
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- Earth, Planets and Space
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Earth, Planets and Space 54 (5), 499-509, 2002
Society of Geomagnetism and Earth, Planetary and Space Sciences, The Seismological Society of Japan, The Volcanological Society of Japan , The Geodetic Society of Japan , The Japanese Society for Planetary Sciences
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Details
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- CRID
- 1390001206514121088
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- NII Article ID
- 10008600258
- 130003780901
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- NII Book ID
- AA11211921
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- ISSN
- 18805981
- 13438832
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- NDL BIB ID
- 6166216
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
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- CiNii Articles
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- Abstract License Flag
- Disallowed