A New Algorithm for Depth Determination from Total Magnetic Anomalies due to Spheres |
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| Authors: | E M Abdelrahman T M El-Araby E R Abo-Ezz K S Soliman K S Essa |
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| Institution: | (1) Geophysics Department, Faculty of Science, Cairo University, Giza, Egypt |
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| Abstract: | We have developed an automatic method to determine the depth of a buried sphere from numerical second horizontal derivative
anomalies obtained from total field magnetic data. The method is based on using a relationship between the depth and a combination
of observations at symmetric points with respect to the coordinate of the projection of the center of the source in the plane
of the measurement points with a free parameter (graticule spacing). The problem of depth determination has been transformed
into the problem of finding a solution of a nonlinear equation of f(z) = 0. Procedures are also formulated to determine the magnetic moment and the effective angle of magnetization. The method
is applied to synthetic examples with and without random errors and tested on a field example from Senegal. In all cases,
the depth solutions are in good agreement with the actual ones. |
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| Keywords: | Magnetic interpretation Sphere model Second derivative method Parametric relationship |
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