The general expression for the magnetic anomaly due to a long horizontal cylinder (Gay, 1965) applicable to all three components, i.e., ΔT, ΔZ, and ΔH, is transformed to obtain its characteristics in the frequency domain. The transformed expression clearly demonstrates that its decay is primarily controlled by the depth of the model, while its value at ω = 0 depends upon the nature of magnetization and the cross-section of the body. It is possible, therefore, to derive the parameters of the causative model directly from the computed transform of the measured anomaly.

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