Affiliation:
1. Faculty of Physics University of Science, Vietnam National University Hanoi Viet Nam
2. Harquail School of Earth Sciences Laurentian University Sudbury Ontario Canada
3. Department of Mathematics Federal University of Paraná Curitiba Paraná Brazil
4. Graduate Program in Geology Federal University of Paraná Curitiba Paraná Brazil
Abstract
AbstractEnhancing 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.
Funder
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
Cited by
2 articles.
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