1887

Abstract

Summary

In recent years, potential field quantities such as the Normalized Source Strength and the Total Gradient have been increasingly used in applied and environmental geophysics because of their properties. They are always non-negative and minimally affected by the direction of the source's remanent magnetization. Despite the fact that these quantities are derived from nonlinear transformations of potential field data, a linear inversion approach of NSS and TG is often used in the literature without investigating its theoretical and practical limits. In this paper, we present an approach for the nonlinear constrained inversion of these quantities and apply it to synthetic data and measurements carried out at the Vredefort structure, South Africa. We show, through GSVD analysis tools, that the nonlinearity of the problem can hamper the inversion results when using a linear approach, whereas our nonlinear iterative approach leads to more reliable reconstructions of the subsurface density/magnetization distribution.

Loading

Article metrics loading...

/content/papers/10.3997/2214-4609.201901494
2019-06-03
2020-04-03
Loading full text...

Full text loading...

References

  1. Dransfield, M.H.
    [2010] Conforming Falcon gravity and the global gravity anomaly. Geophysical Prospecting, 58, 469–483.
    [Google Scholar]
  2. Hansen, P.C.
    [2010] Discrete inverse problems: insight and algorithms (Vol. 7). Siam.
    [Google Scholar]
  3. Lana, C., Gibson, R.L. and Reimold, W.U.
    [2003] Impact tectonics in the core of the Vredefort dome, South Africa: implications for central uplift formation in very large impact structures. Meteorit. Planet. Sci., 38, 1093–1107.
    [Google Scholar]
  4. Li, Z., Yao, C., Zheng, Y. and MengX.
    [2015] 3D data-space inversion of magnetic amplitude data. International Workshop on Gravity, Electrical & Magnetic Methods and their Applications, Chengdu, China. April 19–22, 2015, 77–80.
    [Google Scholar]
  5. Paoletti, V., Ialongo, S., Florio, G., Fedi, M. and Cella, F.
    [2013] Self-constrained inversion of potential fields. Geophysical Journal International, 195(2), 854–869.
    [Google Scholar]
  6. Paoletti, V., Hansen, P.C., Hansen, M.F. and Fedi, M.
    [2014] A Computationally efficient tool for assessing the depth resolution in potential field inversion. Geophysics, 79(4), A33–A38.
    [Google Scholar]
  7. Paoletti, V., Fedi, M., Italiano, F., Florio, G., Ialongo, S.
    [2016] Inversion of Gravity Gradient Tensor Data: does it provide better resolution?Geophysical Journal International, 205, 192–202.
    [Google Scholar]
  8. Pilkington, M. and Beiki, M.
    [2013] Mitigating remanent magnetization effects in magnetic data using the normalized source strength. Geophysics, 78(3), J25–J32.
    [Google Scholar]
  9. Roest, W.R., Verhoef, J. and Pilkington, M.
    [1992] Magnetic interpretation using the 3D analytic signal. Geophysics, 57, 116–125.
    [Google Scholar]
  10. Shearer, S., and Li, Y.
    [2004] 3D Inversion of magnetic total-gradient data in the presence of remanent magnetization. 74th Annual International Meeting, SEG, Expanded Abstracts, 774–777.
    [Google Scholar]
http://instance.metastore.ingenta.com/content/papers/10.3997/2214-4609.201901494
Loading
/content/papers/10.3997/2214-4609.201901494
Loading

Data & Media loading...

This is a required field
Please enter a valid email address
Approval was a Success
Invalid data
An Error Occurred
Approval was partially successful, following selected items could not be processed due to error