3. Date of birth: August 14, 1984 4. Place of birth: Thai Nguyen
5. Admission decision number: Decision No. 4050/QD-KHTN-CTSV dated on September 19, 2013 by the Rector of VNU University of Science.
6. Changes in academic process: None
7. Official thesis title: Research on applying modern methods to analyze and process the magnetic anomaly data in some areas in Vietnam.
8. Major: Geophysics 9. Code: 62 44 01 11
10. Supervisors: Main supervisor: Assoc. Prof. Dr. Do Duc Thanh
Sub-supervisor: Dr. Le Huy Minh
11. Summary of the new findings of the thesis
- Effectively apply the directional analytic signal method of gradient tensor to the magnetic anomaly data in Bo Gioi and Boong Quang (Cao Bang). The research results show that this method is suitable for determining the boundary of isometric anomaly sources, does not depend much on the magnetic inclination angle, and can overcome the interference when the sources are close to each other.
- Introduce the algorithm, develop the program and effectively apply the directional derivative method to the magnetic anomaly data in Tuan Giao area in order to determine the locations of geometrically elongated sources, serving the interpretation of magnetic data in the region with geological faults. This method also does not depend on the magnetic inclination angle, and can overcome the interference when the sources are close to each other.
- Improve the algorithm of inverse problem solution for determining the coordinates of vertices of the polygon and vertical prism to ascertain the depth to the upper surface of magnetic basement in 2D and 3D problems. The result of application on three practical profiles in the southeast of Vietnam’s continental shelf is relatively consistent with the deep structure of this area.
12. Practical applicability, if any:
The results that are obtained when applying these methods to process and analyze the magnetic anomaly in Tuan Giao, Bo Gioi, Boong Quang (Cao Bang) and in the southeast of Vietnam’s continental shelf are useful additional information for the study on geological structures and the mineral exploration in these areas, as well as contribute to the search for magnetic anomaly sources in other areas in Vietnam.
13. Further research directions, if any:
- Investigate in more detail the influence of magnetic inclination angle and the efficiency of application of the methods according to the depth variation of anomaly sources; the effect of interference in case the sources overlap each other at different depths.
- Expand the application of proposed methods in the thesis for analyzing magnetic anomaly data in different study areas in Vietnam to clearly see the effectiveness of these methods.
14. Thesis-related publications:
[1] Nguyen Thi Thu Hang, Do Duc Thanh, Le Huy Minh (2017), “Application of directional derivative method to determine boundary of magnetic sources by total magnetic anomalies”, Vietnam Journal of Earth Sciences, 39(4), pp. 360-375.
[2] Nguyen Thi Thu Hang, Pham Thanh Luan, Do Duc Thanh, Le Huy Minh (2017), “Using the directional analytic signals of magnetic gradient tensor to determine boundaries of source”, VNU Journal of Science: Mathematics – Physics, 33(4), pp. 24-35.
[3] Nguyen Thi Thu Hang, Pham Thanh Luan, Do Duc Thanh, Le Huy Minh (2018), “Improving algorithm of determining the coordinates of the vertices of the polygon to invert magnetic anomalies of two-dimensional basement structures in space domain”, Journal of Marine Science and Technology, 18(3), pp. 312-322.
[4] Nguyen Thi Thu Hang, Erdinc Oksum, Le Huy Minh, Do Duc Thanh (2019), “ An improved space domain algorithm for determining the 3-D structure of the magnetic basement”, Vietnam Journal of Earth Sciences, 41(1), pp. 79-90.
