1887

Abstract

Summary

We present a new constrained inversion method for resolving crustal structure from regional gravity data. The variability of densities is included in the inversion by covariance parameters and the boundary information, obtained from bathymetric and seismic refraction data, is incorporated in the inversion using linear equality constraints. Using the proposed method, model structures with sharp boundaries can be obtained while the existing boundary information and sparse seismic constraints are honoured. We show through a synthetic example and a real-world example from offshore eastern Canada, that the proposed constrained inversion method is a valid tool for studying crustal-scale structures.

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/content/papers/10.3997/2214-4609.201701081
2017-06-12
2024-04-25
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References

  1. Andersen, O. B., P.Knudsen, P.Berry, J.Freeman, N.Pavlis, and S.Kenyon
    [2008] The DNSC08 ocean wide altimetry derived gravity field. EGU 2008 Meeting Programme, Abstract EGU2008-A-07163, G1–1MO1O-003.
    [Google Scholar]
  2. Barbosa, V. C. F., and J. B. C.Silva
    [1994] Generalized compact gravity inversion. Geophysics, 59(1), 57–68.
    [Google Scholar]
  3. Bertete-Aguirre, H., E.Cherkaev, and M.Oristaglio
    [2002] Non-smooth gravity problem with total variation penalization functional. Geophysical Journal International, 149(2), 499–507.
    [Google Scholar]
  4. ChasseriauP., and M.Chouteau
    [2003] 3D gravity inversion using a model of parameter covariance. Journal of Applied Geophysics, 52, 59–74.
    [Google Scholar]
  5. Chian, D., I. D.Reid, and H. R.Jackson
    [2001] Crustal structure beneath Orphan Basin and implications for nonvolcanic continental rifting. Journal of Geophysical Research, 106, 10,923–10,940.
    [Google Scholar]
  6. Farquharson, C. G.
    [2008] Constructing piecewise-constant models in multi-dimensional minimum-structure inversions. Geophysics, 73(1), K1–K9.
    [Google Scholar]
  7. Grant, A. C.
    [1988] Depth to basement of the continental margin of eastern Canada. ‘A’ Series Map 1707A, Geological Survey of Canada, Ottawa, Ontario, Canada.
    [Google Scholar]
  8. Green, W. R.
    [1975] Inversion of gravity profiles by use of a Backus-Gilbert approach. Geophysics, 40, 763–772.
    [Google Scholar]
  9. Last, B. J., and K.Kubik
    [1983] Compact gravity inversion. Geophysics, 48(6), 713–721.
    [Google Scholar]
  10. Li, Y., and D. W.Oldenburg
    [1998] 3-D inversion of gravity data. Geophysics, 63(1), 109–119.
    [Google Scholar]
  11. Nabighian, M. N., M. E.Ander, V. J. S.Grauch, R. O.Hansen, T. R.LaFehr, Y.Li, W. C.Pearson, J. W.Peirce, J. D.Phillips, and M. E.Ruder
    [2005] 75th Anniversary: Historical development of the gravity method in exploration. Geophysics, 70(6), 33ND–61ND.
    [Google Scholar]
  12. Pilkington, M.
    [2009] 3D magnetic data-space inversion with sparseness constraints. Geophysics, 74(1), L7–L15.
    [Google Scholar]
  13. Portniaguine, O., and M. S.Zhdanov
    [1999] Focusing geophysical inversion images. Geophysics, 64(3), 874–887.
    [Google Scholar]
  14. Richardson, R. M., and S. C.Macinnes
    [1989] The inversion of gravity data into three-dimensional polyhedral models. Journal of geophysical research, 94(b6), 7555–7562.
    [Google Scholar]
  15. Tarantola, A., and B.Valette
    [1982] Generalized nonlinear inverse problems solved using the least squares criterion. Reviews of Geophysics and Space Physics, 20(2), 219–232.
    [Google Scholar]
  16. Tarantola, A.
    [2005] Inverse problem theory and methods for model parameter estimation. Society for industrial and applied mathematics.
    [Google Scholar]
  17. Welford, J. K., P. M.Shannon, B. M.O’Reilly, and J.Hall
    [2012] Comparison of lithosphere structure across the Orphan Basin-Flemish Cap and Irish Atlantic conjugate continental margins from constrained 3-D gravity inversion. Journal of the Geological Society of London, 169, 405–420.
    [Google Scholar]
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