tailieunhanh - An improved space domain algorithm for determining the 3-D structure of the magnetic basement

The paper presents an improved algorithm based on Bhaskara Rao and Ramesh Babu’s algorithm to invert magnetic anomalies of three-dimensional basement structures. The magnetic basement is approximated by an ensemble of juxtaposed vertical prisms whose bottom surface coincides with Curie surface with the known depth. | Vietnam Journal of Earth Sciences 41 1 69-80 Doi 0866-7187 41 1 13550 VAST Vietnam Academy of Science and Technology Vietnam Journal of Earth Sciences http jse An improved space domain algorithm for determining the 3-D structure of the magnetic basement Nguyen Thi Thu Hang1 Erdinc Oksum2 Le Huy Minh3 Do Due Thanh1 1VNU Hanoi - University of Science Faculty of Physics Department of Geophysics 2Suleyman Demirel University Engineering Faculty Department of Geophyisical Engineering 32260 Isparta Turkey 3Institute of Geophysics VAST Received 2 September 2018 Received in revised form 29 December 2018 Accepted 9 January 2019 ABSTRACT The paper presents an improved algorithm based on Bhaskara Rao and Ramesh Babu s algorithm to invert magnetic anomalies of three-dimensional basement structures. The magnetic basement is approximated by an ensemble of juxtaposed vertical prisms whose bottom surface coincides with Curie surface with the known depth. The computer program operating with the proposed algorithm is built in Matlab environment. Test applications show that the proposed method can perform computations with fast and stable convergence rate where the results also coincide well with the actual model structure. The effectiveness of the method is demonstrated by inverting magnetic anomalies of the southeast part of Vietnam continental shelf. The calculated magnetic basement relief of the study area provides useful additional information for studies in the aim of dealing with the geological structure of the area. Keywords . 3D magnetic inversion magnetic basement Vietnam s continental shelf. 2019 Vietnam Academy of Science and Technology 1. Introduction Understanding the deep structure of the crust is one of the objects of geophysics in which the determination of the depth of magnetic sources constitute an important task in studying and interpreting geological and tectonic problems. So far a series of methods have been introduced for .