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Volume :29 Issue : 1 2002      Add To Cart                                                                    Download

A numerical approach to depth determination from magnetic data

Auther : EL-SAYED M. ABDELRAHMAN, HESHAM M. EL-ARABY, TAREK M. EL-ARABY AND KHALID S. ESSA

 Geophysics Department, Faculty of Science, Cairo University, Giza, Egypt.

ABSTRACT

We have developed a numerical approach to depth determination from magnetic data. By defining a few characteristic points and distances on the profile, the problem of depth determination from magnetic data has been transformed into finding a solution to a nonlinear equation of the form f(z) = 0. Formulas have been derived which are applicable to a sphere, horizontal cylinder, dike, and a geologic contact. Procedures have also been formulated to estimate the effective magnetization intensity and the effective magnetization inclination. The method is applied to synthetic data with and without random errors. Errors in the model parameters due to errors in the characteristic points and distances were also studied through imposing ±1 — 10% errors on these parameters on a synthetic profile due to a thin dike. Finally, the method is applied to two field examples from Brazil and India. In both cases examined, the depth parameter is found to be in good agreement with that determined by other methods.

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