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

Pham, Luan Thanh; Oliveira, Saulo P.

doi:10.1007/s00024-023-03375-y

Pure Appl. Geophys.

2023

DOI: 10.1007/s00024-023-03375-y

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

Luan Thanh Pham,

Saulo P. Oliveira

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2024

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Cited by 3 publications

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Subsurface interconnection beneath the Mio-Plio-Quaternary volcanoes of the Ain Leuh causse (Middle Atlas, Morocco): Structural framework and emplacement mechanisms

Mali,

Elabouyi,

Driouch

et al. 2024

Journal of African Earth Sciences

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Subsurface interconnection beneath the Mio-Plio-Quaternary volcanoes of the Ain Leuh causse (Middle Atlas, Morocco): Structural framework and emplacement mechanisms

Mali,

Elabouyi,

Driouch

et al. 2024

Journal of African Earth Sciences

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A Stable Method for Detecting the Edges of Potential Field Sources

Pham

2024

IEEE Trans. Geosci. Remote Sensing

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Enhancing magnetic source edges using the tilt angle of the analytic‐signal amplitudes of the horizontal gradient

Pham,

Smith,

Oliveira

et al. 2024

Geophysical Prospecting

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Enhancing magnetic data is often complicated due to the non‐vertical orientation of the geomagnetic field and the orientation of remanent source magnetization. The complication can be reduced by reducing the data to the pole (mathematically making the geomagnetic field vertical), but this reduction process is problematic. The analytic‐signal amplitude can be used to enhance the edges of two‐dimensional sources without a reduction to the pole. However, the shape of the analytic‐signal amplitude is weakly dependent on the magnetization direction for grid data. This study presents an improved technique, namely the tilt angle of the analytic‐signal amplitudes of the horizontal gradient of the vertical integral. This quantity is also only weakly dependent on the magnetization direction and outlines the edges as well or somewhat better than other methods. It also implicitly involves second derivatives of the magnetic field, and we use synthetic data to demonstrate that noise is not amplified as much as it is when using other edge enhancement techniques that implicitly use second derivatives. A dataset of the Apiaí Terrane, Brazil, shows good lateral continuity of features compared with other edge‐enhancement methods, and subtle features like faults are easier to identify in the images generated by our new method. Upward continuation of the field, which is normally required, was not necessary to reduce the impact of noise on this field example.

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

Cited by 3 publications

References 56 publications

Subsurface interconnection beneath the Mio-Plio-Quaternary volcanoes of the Ain Leuh causse (Middle Atlas, Morocco): Structural framework and emplacement mechanisms

Subsurface interconnection beneath the Mio-Plio-Quaternary volcanoes of the Ain Leuh causse (Middle Atlas, Morocco): Structural framework and emplacement mechanisms

A Stable Method for Detecting the Edges of Potential Field Sources

Enhancing magnetic source edges using the tilt angle of the analytic‐signal amplitudes of the horizontal gradient

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