1887

Abstract

Summary

The complex analytic signal is a theoretical concept that is useful to geophysical data processing. The analytic signal of a seismic trace can provide information on the reflection strength and the instantaneous phase. For gravity and magnetic data, the complex analytic signal is usually defined from horizontal derivatives of the anomalous field. Its amplitude and phase, which are known as the analytic signal amplitude and the tilt angle, respectively, are well-known enhancement filters. Recently, a transformation that sharpens the instantaneous phase of the analytic signal has been proposed, improving the temporal and spatial resolution of reflections in seismic traces. We noted that this transformation is effective for potential field maps as well. In fact, the transformed instantaneous phase turns out to enhance the tilt angle filter. Enhancements of the tilt angle can also be obtained, e.g., by multiplicative factors or by combining it with the horizontal tilt angle, but the improvements of our approach apply not only to the tilt angle, but to all components of the complex analytic signal. This is illustrated with aeromagnetic data from the Jinchuan Cu-Ni sulfide deposit (China).

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/content/papers/10.3997/2214-4609.202520225
2025-09-07
2026-02-15
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References

  1. Castro, F.R., Oliveira, S.P., De Souza, J. and Ferreira, F.J.F. [2018] Combining tilt derivative filters: new approaches to enhance magnetic anomalies. Revista Brasileira de Geofísica, 36(3), 1–9.
    [Google Scholar]
  2. Cooper, G. [2016] The downward continuation of the tilt angle. Near Surface Geophysics, 14(5), 385–390.
    [Google Scholar]
  3. Cordell, L. and Grauch, V.J.S. [1985] Mapping basement magnetization zones from aeromagnetic data in the San Juan Basin, New Mexico. In: Hinze, W.J. (Ed.) The utility of regional gravity and magnetic anomaly maps, SEG, 181–197.
    [Google Scholar]
  4. Ferreira, F.J.F., De Souza, J., Bongiolo, A.B.S. and Castro, L.G [2013] Enhancement of the total horizontal gradient of magnetic anomalies using the tilt angle. Geophysics, 78(3), J33–J41.
    [Google Scholar]
  5. Miller, H.G. and Singh, V. [1994] Potential field tilt - a new concept for location of potential field sources. J Appl Geophys, 32(2–3), 213–217.
    [Google Scholar]
  6. Nabighian, M.N. [1972] The analytic signal of two-dimensional magnetic bodies with polygonal cross-section: its properties and use for automated anomaly interpretation. Geophysics, 37(3), 507–517.
    [Google Scholar]
  7. Nabighian, M.N. [1984] Toward a three-dimensional automatic interpretation of potential field data via generalized Hilbert transforms: Fundamental relations. Geophysics, 49(6), 780–786.
    [Google Scholar]
  8. Pham, L.T [2024] A stable method for detecting the edges of potential field sources. IEEE Transactions on Geoscience and Remote Sensing, 62, 5912107.
    [Google Scholar]
  9. Porsani, M.J. and Ursin, B. [2024] Signal Resolution Enhancement with a Non-Linear Phase Transformation. In: 85th EAGE Annual Conference & Exhibition. EAGE.
    [Google Scholar]
  10. Porsani, M.P [2022] Improving seismograms' resolution by using a phase-shrinkage filtering method. Brazilian Journal of Geophysics, 40(5), 21–33.
    [Google Scholar]
  11. Roest, W.R., Verhoef, J. and Pilkington, M. [1992] Magnetic interpretation using the 3-D analytic signal. Geophysics, 57(1), 116–125.
    [Google Scholar]
  12. Taner, M.T., Koehler, F. and Sheriff, R.E. [1979] Complex seismic trace analysis. Geophysics, 44(6), 1041–1063.
    [Google Scholar]
  13. Zhang, J., Zeng, Z., Zhao, X., Li, J., Zhou, Y. and Gong, M. [2020] Deep mineral exploration of the Jinchuan Cu-Ni sulfide deposit based on aeromagnetic, gravity, and CSAMT methods. Minerals, 10(2), 168.
    [Google Scholar]
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