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Edge Enhancement of Magnetic Sources Using the Tilt Angle and Derivatives of Directional Analytic Signals

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Abstract

The analytic signal (AS1) has been widely used for mapping geological features from magnetic data. Some enhanced versions of the AS1 have been introduced to improve its effectiveness. Here, we compare the performance of these filters and introduce a filter obtained from the tilt angle and the directional analytic signals. For better performance on low latitudes, the directional analytic signals are obtained from the vertical integral of the magnetic anomaly rather than its magnetic potential. The proposed filter shows an apparent performance improvement in mapping the edges of magnetic sources, as shown with synthetic models and real example from the Olympic Peninsula, USA. The great advantage of the proposed technique is that the obtained result has lower influence from the magnetization vector direction than the AS1 and other related techniques. The findings demonstrate that the present method not only outlines the boundaries more precisely and clearly, but also reveals the presence of several structures obscured by nonmagnetic sediment in the study area, which are not determined by other methods.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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Acknowledgements

The authors thank editor Rezene Mahatsente, reviewers Yunus Levent Ekinci, Henglei Zhang, and an anonymous reviewer for their constructive comments that greatly improved the original manuscript. The authors also thank GRJ Cooper for his very useful comments in an earlier stage of this work.

Funding

The present work was supported by National Council of Technological and Scientific Development (CNPq, Grant Number 316376/2021-3).

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Authors and Affiliations

  1. Faculty of Physics, University of Science, Vietnam National University, Hanoi, Viet Nam

    Luan Thanh Pham

  2. Department of Mathematics, Federal University of Paraná, Caixa Postal 19096, Curitiba, PR, Brazil

    Saulo P. Oliveira

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  1. Luan Thanh Pham
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LTP and SPO contributed to establish the basis of the method and to write the manuscript. Luan Thanh Pham contributed to the development of computer program related to the method.

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Correspondence to Luan Thanh Pham.

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Pham, L.T., Oliveira, S.P. Edge Enhancement of Magnetic Sources Using the Tilt Angle and Derivatives of Directional Analytic Signals. Pure Appl. Geophys. 180, 4175–4189 (2023). https://doi.org/10.1007/s00024-023-03375-y

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