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Article << Previous     |     Next >>   Contents Vol 43(3)

Parametric inversion of residual magnetic anomalies due to simple geometric bodies

El-Sayed M. Abdelrahman 1 2 Eid R. Abo-Ezz 1 Khalid S. Essa 1

1 Geophysics Department, Faculty of Science, Cairo University, Giza, Egypt.
2 Corresponding author. Email: sayed5005@yahoo.com

Exploration Geophysics 43(3) 178-189 http://dx.doi.org/10.1071/EG11026
Submitted: 23 May 2011  Accepted: 18 April 2012   Published: 4 June 2012
 
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Abstract

We have developed a simple method to determine the depth, inclination parameter and amplitude coefficient of a buried structure from a residual magnetic anomaly profile using a new formula representing the magnetic anomaly expressions produced by most geological structures. The method is based on defining the anomaly value at the origin and four characteristic points and their corresponding distances on the anomaly profile. Using all possible combinations of the four characteristic points and their corresponding distances, a procedure is developed for automated determination of the best fit model parameters including the shape (shape factor) of the buried structure from magnetic data.

The method was applied to synthetic data with and without random errors and tested on two field examples from Canada and India. In both cases, the model parameters obtained by the present method, particularly the shape and depth of the buried structures, were found to be in good agreement with the actual parameters. The present method has the capability of avoiding highly noisy data points and enforcing the incorporation of points of the least random errors to enhance the interpretation results.

Key words: interpretation, magnetic data, new formula, noise, numerical methods.


References

Abdelrahman, E. M., and Essa, K. S., 2005, Magnetic interpretation using a least-squares curves method: Geophysics, 70, 23–40
| CrossRef |

Abdelrahman, E. M., and Salem, A., 2005, A least-squares minimization approach to depth determination from numerical horizontal magnetic gradients: Kuwait Journal of Science and Engineering, 22, 103–118

Abdelrahman, E. M., Abo-Ezz, E. R., Essa, K. S., El-Araby, T. M., and Soliman, K. S., 2007, A new least-squares minimization approach to depth and shape determination from magnetic data: Geophysical Prospecting, 55, 433–446
| CrossRef |

Demidovich, B.P., and Maron, I.A., 1973, Computational mathematics: Mir Publishers.

Dondurur, D., and Pamukcu, O. A., 2003, Interpretation of magnetic anomalies due to dykes: Geophysical Prospecting, 11, 509–522

Gay, P., 1963, Standard curves for interpretation of magnetic anomalies over long tabular bodies Geophysics, 28, 161–200
| CrossRef |

Gay, P, 1965, Standard curves for interpretation of magnetic anomalies over long horizontal cylinder: Geophysics, 30, 818–828

Gerovska, D., and Arauzo-Bravo, M. J., 2003, Automatic interpretation of magnetic data based on Euler deconvolution with unprescribed structural index Computers & Geosciences, 29, 949–960
| CrossRef |

Hartman, R. R., Teskey, D. J., and Friedberg, J. L., 1971, A system for rapid digital aeromagnetic interpretation Geophysics, 36, 891–918
| CrossRef |

Hsu, S., 2002, Imaging magnetic sources using Euler’s equation: Geophysical Prospecting, 50, 15–25
| CrossRef |

Hutchison, R. D., 1958, Magnetic analysis by logarithmic curves: Geophysics, 23, 749–767
| CrossRef |

Ku, C. C., and Sharp, J. A., 1983, Werner deconvolution for automated magnetic interpretation and its refinement using Marquardt’s inverse modelling: Geophysics, 48, 754–774
| CrossRef |

Li, X., 2003, On the use of different methods for estimating magnetic depth: The Leading Edge, 22, 1090–1101
| CrossRef |

McGrath, P. H., and Hood, P. J., 1970, The dipping dike case: a computer curve matching method of magnetic interpretation: Geophysics, 35, 831–848
| CrossRef |

McGrath, P. H., and Hood, P. J., 1973, An automatic least-squares multimodal method for magnetic interpretation: Geophysics, 38, 349–358
| CrossRef |

Prakasa Rao, T. K. S., and Subrahmanyam, M., 1988, Characteristic curves for inversion of magnetic anomalies of spherical ore bodies: Pure and Applied Geophysics, 126, 69–83
| CrossRef |

Prakasa Rao, T. K. S., Subrahmanyam, M., and Srikrishna Murthy, A., 1986, Nomograms for the direct interpretation of magnetic anomalies due to long horizontal cylinders: Geophysics, 51, 2156–2159
| CrossRef |

Press, W. H., Flannery, B. P., Teukolsky, S. A., and Vetterling, W. T., 1986, Numerical recipes: the art of scientific computing: Cambridge University Press.

Rao, B. S. R., Radhakrishna Murthy, I. V., and Visweswara Rao, C., 1973, A computer program for interpreting vertical magnetic anomalies of spheres and horizontal cylinders: Pure and Applied Geophysics, 110, 2056–2065
| CrossRef |

Rao, B. S. R., Prakasa Rao, T. K. S., and Krishna Murthy, A. S., 1977, A note on magnetized spheres: Geophysical Prospecting, 25, 746–757
| CrossRef |

Reid, A. B., Allsop, J. M., Grnser, H., Millett, A. J., and Somerton, I. W., 1990, Magnetic interpretation in three-dimensional using Euler deconvolution: Geophysics, 55, 80–91
| CrossRef |

Silva, J. B. C., 1989, Transformation of nonlinear problems into linear ones applied to the magnetic field of a two-dimensional prism: Geophysics, 54, 114–121
| CrossRef |

Stanley, J. M., 1977, Simplified magnetic interpretation of the geologic contact and thin dike: Geophysics, 42, 1236–1240
| CrossRef |

Subrahmanyam, M., and Prakasa Rao, T. K. S., 2009, Interpretation of magnetic anomalies using simple characteristics positions over tabular bodies: Exploration Geophysics, 40, 265–276
| CAS |

Steenland, N. C., 1968, Discussion on ‘The geomagnetic gradiometer’ by H. A. Slack, V. M. Lynch and L. Langan (Geophysics, October l967, 877–892): Geophysics, 33, 681–684

Thompson, D. T., 1982, EULDPH - a new technique for making computer-assisted depth estimates from magnetic data: Geophysics, 47, 31–37
| CrossRef |

Verma, R. K., and Bandopadhyay, R. R., 1975, A magnetic survey over Bankura Anorthosite complex and surrounding areas: Indian Journal of Earth Sciences, 2, 117–124


   
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