Comparison of different approaches of computing the tilt angle of the total horizontal gradient and tilt angle of the analytic signal amplitude for detecting source edges

Year 2021, Volume: 165 Issue: 165, 53 - 62, 19.08.2021

Luan Pham , Erdinc Oksum Thanh Duc Do Minh Duc Vu

https://doi.org/10.19111/bulletinofmre.746858

Cited By: 7

Abstract

This paper compares effectiveness of the different approaches of computing the tilt angle of the horizontal gradient amplitude and tilt angle of the analytic signal amplitude such as use of direct expression and frequency domain technique (also called k - function) in terms of their accuracy on the detection of the edges of magnetic and gravity sources. These approaches were performed on both synthetic magnetic and gravity data where the frequency domain technique shows improvements in delineation of the actual edges of the sources compared to the direct expression. Additionally, real magnetic data from Zhurihe (Northeast China), and real gravity data from Tuan Giao (Northwest Vietnam) was considered and the obtained results from applying the different approaches were compared with known geological structures. The results show that the boundaries detected from the use of the frequency domain technique are in accord with the known geological structures.

Keywords

Edge Detection, Horizontal Gradient, Analytic Signal, Tilt Angle, Direct Expression, Frequency Technique.

Thanks

The authors record with pleasure their sincere thanks to the editor and the reviewers for their very constructive suggestions to improve the paper. This research is funded by the Vietnam National University, Hanoi (VNU) under project number QG.20.13.

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