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Volume 54 Number 1
  • E-ISSN: 1365-2478

Abstract

ABSTRACT

Magnitude transforms include magnitude magnetic anomalies (MMA), their gradients and Laplacians. They can be calculated from the total magnetic anomalies or other component anomalies. Magnitude magnetic anomalies have a space distribution different from that of the component anomalies. Their values are non‐negative and their respective patterns are similar to the positive gravity anomalies. Magnitude transforms are an effective tool for magnetic data analysis due to their simplified pattern and direct correlation with the space location of the source. They have advantages over the traditionally used reduction‐to‐the‐pole (RTP) transform, especially at low magnetic latitudes. The calculation of magnitudes of the anomalous field requires the total field data to be transformed into the component anomalies, while the reduction‐to‐the‐pole transform also includes a rotation of the magnetization vector, the orientation of which is usually assumed. For equal latitudes, the transfer functions of component‐component transforms in the frequency domain show better stability than the component‐component‐rotation transfer function. This is illustrated by a comparison of analytical expressions, and synthetic models of magnetic fields. The Dixon seamount case shows the possibilities for an improved data analysis and more confident source recognition at low latitudes using magnetic transforms.

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2005-12-09
2024-04-25

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References

  1. BeardL.P.2000. Detection and identification of north‐south trending magnetic structures near the magnetic equator. Geophysical Prospecting48, 745–761.
    [Google Scholar]
  2. BlakelyR.J.1995. Potential Theory in Gravity and Magnetic Applications . Cambridge University Press, Cambridge .
    [Google Scholar]
  3. FrancheteauJ., SclaterJ.G. and CraigH.1969. Magnetization of a recently discovered seamount in the central Pacific (short note). Geophysics34, 645–651.
    [Google Scholar]
  4. GerovskaD., Araúzo‐BravoM. and StavrevP.2004. Determination of the parameters of compact ferro‐metallic objects with transforms of magnitude magnetic anomalies. Journal of Applied Geophysics55, 173–186.
    [Google Scholar]
  5. GrantF.S. and DoddsJ.1972. MAGMAP FFT Processing System Development Notes . Paterson Grant and Watson Limited.
    [Google Scholar]
  6. GunnP.1975. Linear transformations of gravity and magnetic fields. Geophysical Prospecting23, 300–312.
    [Google Scholar]
  7. HansenR.O. and PawlowskiR.S.1989. Reduction‐to‐the‐pole at low latitudes by Wiener filtering. Geophysics54, 1607–1613.
    [Google Scholar]
  8. LiY. and OldenburgD.W.2001. Stable reduction to the pole at the magnetic equator. Geophysics66, 571–578.
    [Google Scholar]
  9. MendoncaC.A. and SilvaJ.B.C.1993. A stable truncated series approximation of the reduction‐to‐the‐pole operator. Geophysics58, 1084–1090.
    [Google Scholar]
  10. NabighianM.N.1972. The analytic signal of two‐dimensional magnetic bodies with polygonal cross‐section: its properties and use for automated anomaly interpretation. Geophysics37, 507–517.
    [Google Scholar]
  11. RoestW.R., VerhoefJ. and PilkingtonM.1992. Magnetic interpretation using the 3D analytic signal. Geophysics57, 116–125.
    [Google Scholar]
  12. SilvaJ.B.C.1986. Reduction to the pole as an inverse problem and its application to low‐latitude anomalies. Geophysics51, 369–382.
    [Google Scholar]
  13. SinghB. and GuptasarmaD.2001. New method for fast computation of gravity and magnetic anomalies from arbitrary polyhedra. Geophysics66, 521–526.
    [Google Scholar]
  14. StavrevP. and GerovskaD.2000. Magnetic field transforms with low sensitivity to the direction of source magnetization and high centricity. Geophysical Prospecting48, 317–340.
    [Google Scholar]
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Magnetic data analysis at low latitudes using magnitude transforms
Geophysical Prospecting 54, 89 (2006); https://doi.org/10.1111/j.1365-2478.2006.00518.x
/content/journals/10.1111/j.1365-2478.2006.00518.x
/content/journals/10.1111/j.1365-2478.2006.00518.x
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  • Article Type: Research Article

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