Direct analytic signal (DAS) method in the interpretation of magnetic data |
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| Institution: | 1. Department of Geology, Ebonyi State University, Abakaliki, Nigeria;2. Department of Geological Sciences, Nnamdi Azikiwe University, Awka, Nigeria;3. Department of Mathematics, African University of Science and Technology, Abuja, Nigeria;1. Posgrado en Ciencias de la Tierra, Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito interior s/n, Coyoacán, 04510 Ciudad de México, México;2. Instituto de Geofísica, Universidad Nacional Autónoma de México, Circuito interior s/n, Coyoacán, 04510 Ciudad de México, México;3. Leibniz Institute for Applied Geophysics, Stilleweg 2, 30655 Hannover, Germany;4. Institut für Geologie, Leibniz Universität Hannover, Callinstraße 30, 30167 Hannover, Germany;1. Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China;2. Key Laboratory of Submarine Geoscience, State Oceanic Administration, Hangzhou 310012, China;3. College of Geo-exploration Science and Technology, Jilin University, Changchun 130026, China |
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| Abstract: | We presented a new method for interpreting 2D magnetic data, called direct analytic signal (DAS) method, which directly used the analytic signal of magnetic anomaly to compute the depth and the structural index of the source. The DAS method needs only the computation of the first order derivatives of magnetic anomaly, so that the inversion results are more stable than the results obtained by the other existing analytic signal methods. The DAS method is tested on synthetic magnetic data with and without noise, and the DAS method can successfully obtain the depth and the structural index of the source. We also applied the DAS method to interpret a real magnetic data over a shallow geological source whose source parameters are known from closely drilling information, and the inversion results are in accord with the true values. |
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