1887
Volume 47, Issue 4
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

[

If the horizontal and vertical derivatives of the total field magnetic anomalies of thin dykes and contacts (and the magnetic anomaly from a thin dyke) are put into an amplitude-phase form, then this can aid in their interpretation. First, it allows derivatives of fractional order to be calculated analytically; second, estimates of the source dip can be made; and finally, the relationships between local wavenumber and source-distance semi-automatic interpretation methods are clarified. The approach is demonstrated on synthetic data and aeromagnetic data from South Africa.

,

If the horizontal and vertical derivatives of the total field magnetic anomalies of thin dykes and contacts are put into an amplitude-phase form, then this can aid in their interpretation. In addition, the relationships between local wavenumber and source-distance semi-automatic interpretation methods are clarified.

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2016-12-01
2026-01-14
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References

  1. Cooper G. R. J. 2014 a Euler deconvolution in a radial coordinate system: Geophysical Prospecting 62 1169 1179 10.1111/1365‑2478.12123
    https://doi.org/10.1111/1365-2478.12123 [Google Scholar]
  2. Cooper G. R. J. 2014 b The automatic determination of the location and depth of contacts and dykes from aeromagnetic data: Pure and Applied Geophysics 171 2417 2423 10.1007/s00024‑014‑0789‑8
    https://doi.org/10.1007/s00024-014-0789-8 [Google Scholar]
  3. Cooper G. R. J. 2015 Using the analytic signal amplitude to determine the location and depth of thin dykes from magnetic data: Geophysics 80 J1 J6 10.1190/geo2014‑0061.1
    https://doi.org/10.1190/geo2014-0061.1 [Google Scholar]
  4. Cooper G. R. J. Cowan D. R. 2003 The application of fractional calculus to potential field data: Exploration Geophysics 34 51 56 10.1071/EG03051
    https://doi.org/10.1071/EG03051 [Google Scholar]
  5. Cooper G. R. J. Whitehead R. C. 2016 Determining the distance to magnetic sources: Geophysics 81 J39 J48 10.1190/GEO‑2015‑0142.1
    https://doi.org/10.1190/GEO-2015-0142.1 [Google Scholar]
  6. Florio G. Fedi M. Pasteka R. 2006 On the application of Euler deconvolution to the analytic signal: Geophysics 71 L87 L93 10.1190/1.2360204
    https://doi.org/10.1190/1.2360204 [Google Scholar]
  7. Hsu S.-K. Sibuet J.-C. Shyu C.-T. 1996 High-resolution detection of geologic boundaries from potential field anomalies: an enhanced analytic signal technique: Geophysics 61 373 386 10.1190/1.1443966
    https://doi.org/10.1190/1.1443966 [Google Scholar]
  8. Misral, S., and Andreoli, M. A. G., 2012. Post-impact dolerite dykes in the ~145 Ma Morokweng Crater, South Africa: impact related? 43rd Lunar and Planetary Science Conference, 1–4.
  9. Nabighian M. N. 1972 The analytical signal of 2D magnetic bodies with polygonal cross-section: its properties and use for automated anomaly interpretation: Geophysics 37 507 517 10.1190/1.1440276
    https://doi.org/10.1190/1.1440276 [Google Scholar]
  10. Reford M. S. 1964 Magnetic anomalies over thin sheets: Geophysics 29 532 536 10.1190/1.1439388
    https://doi.org/10.1190/1.1439388 [Google Scholar]
  11. Reid A. B. Allsop J. M. Granser H. Millet A. J. Somerton I. W. 1990 Magnetic interpretation in three dimensions using Euler deconvolution: Geophysics 55 80 91 10.1190/1.1442774
    https://doi.org/10.1190/1.1442774 [Google Scholar]
  12. Salem A. Ravat D. Smith R. S. Ushijima K. 2005 Interpretation of magnetic data using an enhanced local wavenumber (ELW) method: Geophysics 70 L7 L12 10.1190/1.1884828
    https://doi.org/10.1190/1.1884828 [Google Scholar]
  13. Salem A. Williams S. Fairhead J. D. Ravat D. Smith R. S. 2007 Tilt-depth method: a simple depth estimation method using first-order magnetic derivatives: The Leading Edge 26 1502 1505 10.1190/1.2821934
    https://doi.org/10.1190/1.2821934 [Google Scholar]
  14. Taner M. T. Koehler F. Sheriff R. E. 1979 Complex seismic trace analysis: Geophysics 44 1041 1063 10.1190/1.1440994
    https://doi.org/10.1190/1.1440994 [Google Scholar]
  15. Thompson D. T. 1982 Euldph: a new technique for making computer assisted depth estimates from magnetic data: Geophysics 47 31 37 10.1190/1.1441278
    https://doi.org/10.1190/1.1441278 [Google Scholar]
  16. Thurston J. B. Smith R. S. 1997 Automatic conversion of magnetic data to depth, dip, and susceptibility contrast using the SPI method: Geophysics 62 807 813 10.1190/1.1444190
    https://doi.org/10.1190/1.1444190 [Google Scholar]
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  • Article Type: Research Article
Keyword(s): magnetics, semiautomatic interpretation, potential fields.

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