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Abstract

Summary

In this study, different approaches to solve the magnetotelluric forward modelling problems are investigated. Beside classical direct electromagnetic (Direct EM) formulation, ungauged and gauged (Lorenz, Coulomb and axial) vector and scaler potential formulations are discretized using finite difference numerical solution technique. Linear matrix equations obtained from finite difference discretization for each EM field formulations are solved by using conjugate gradient iterative solution method. We compared finite different solutions of each approaches with respect to accuracy and speed. We showed that all approaches generate accurate result. However, ungauged approach gave solution with less number of CG iteration accordingly less CPU time. All stiffness matrices arising from each formulation are examined in terms of size and its type. Finite difference solution of the Coulomb gauge and ungauged approaches generates bigger size stiffness matrices than the other approaches’. Direct EM, ungauged, axial gauge approaches generates symmetric stiffness matrix. In this study, we suggest to use ungauged approach in inversion algorithms which gave fast forward solution amongst others

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/content/papers/10.3997/2214-4609.201702546
2017-11-05
2024-04-16

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References

  1. Ansari, S., Farquharson, C.G.
    , 2014. 3D finite-element forward modeling of electromagnetic data using vector and scalar potentials and unstructured grids, Geophysics, 79(4), E149–E165.
     [Google Scholar]
  2. Badea, E.A., Everett, M.E., Newman, G.A., Biro, O.
    , 2001. Finite-element analysis of controlled-source electromagnetic induction using Coulomb-gauged potentials, Geophysics, 66, 786–799.
     [Google Scholar]
  3. Haber, E., Ascher, U.M., Aruliah, D.A., Oldenburg, D.W.
    , 2000. Fast Simulation of 3D Electromagnetic Problems Using Potentials, J. Comput. Phys, 161(1), 150–171.
     [Google Scholar]
  4. Jahandari, H., Farquharson, C.G.
    , 2015. Finite-volume modelling of geophysical electromagnetic data on unstructured grids using potentials, Geophysical Journal International, 202, 1859–1876.
     [Google Scholar]
  5. Mackie, R.L., Smith, J.T., MaddenT.R.
    , 1994. Three-dimensional electromagnetic modeling using finite difference equations: The magnetotelluric example, Radio Science, 29, 923–935.
     [Google Scholar]
  6. Miensopust, M.P., Queralt, P., Jones, A.G., and 3D MT modellers
    , 2013. Magnetotelluric 3-D inversion—a review of two successful workshops on forward and inversion code testing and comparison, Geophysical Journal International, 193, 1216–1238.
     [Google Scholar]
  7. Mukherjee, S., Everett, M.E
    , 2011. 3D controlled-source electromagnetic edge-based finite element modeling of conductive and permeable heterogeneitiesGeophysics, 76(4), F215–F226.
     [Google Scholar]
  8. Newman, G.A., Alumbaugh, D.L.
    , 1995. Frequency-domain modelling of airborne electromagnetic responses using staggered finite differences, Geophysical Prospecting, 43, 1021–1042.
     [Google Scholar]
  9. Nam, M.J., KimH.J., SongY., Lee, T.J., Son, J., Suh, J.H.
    , 2007. 3D magnetotelluric modelling including surface topography, Geophysical Prospecting, 55, 277–287.
     [Google Scholar]
  10. Sasaki, Y.
    , 2001. Full 3-D inversion of electromagnetic data on PC, J. appl. Geophys., 46, 45–54.
     [Google Scholar]
  11. Um, E.S., Alumbaugh, D.L., Harris, J.M.
    , 2010. A Lorenz-gauged finite-element solution for transient CSEM modelling, 2010 SEG Annual Meeting.
     [Google Scholar]
  12. Varentsov, I. M.
    , 1983. Modern trends in the solution of forward and inverse 3D electromagnetic induction problems, Geophysics, 6(1), 55–78.
     [Google Scholar]
  13. Wannamaker, P. E., Hohmann, G. W., and Ward, S. H.
    , 1984. Magnetotelluric responses of three-dimensional bodies in layered earths. Exploration Geophysics, 15(3), 190–191.
     [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201702546
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Comparison Study Of Different Formulations Used In 3D Magnetotelluric Modeling
Conference Proceedings 2017, 1 (2017); https://doi.org/10.3997/2214-4609.201702546
/content/papers/10.3997/2214-4609.201702546
/content/papers/10.3997/2214-4609.201702546
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