A New Best-Estimate Methodology for Determining Magnetic Parameters Related to Field Anomalies Produced by Buried Thin Dikes and Horizontal Cylinder-like Structures |
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| Authors: | M Tlas J Asfahani |
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| Institution: | (1) Atomic Energy Commission, P.O. Box 6091, Damascus, Syria |
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| Abstract: | A new best estimate methodology is proposed and oriented towards the determination of parameters related to a magnetic field
anomaly produced by a simple geometric-shaped model or body such as a thin dike and horizontal cylinder. This approach is
mainly based on solving a system of algebraic linear equations for estimating the three model parameters, e.g., the depth
to the top (center) of the body (z), the index parameter or the effective magnetization angle (θ) and the amplitude coefficient or the effective magnetization intensity (k). The utility and validity of this method is demonstrated by analyzing two synthetic magnetic anomalies, using simulated
data generated from a known model with different random errors components and a known statistical distribution. This approach
was also examined and applied to two real field magnetic anomalies from the United States and Brazil. The agreement between
the results obtained by the proposed method and those obtained by other interpretation methods is good and comparable. Moreover,
the depth obtained by such an approach is found to be in high accordance with that obtained from drilling information. The
advantages of such a proposed method over other existing interpretative techniques are clarified, where it can be generalized
to be automatically applicable for interpreting other geological structures described by mathematical formulations. |
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