Open AccessEnhancing the quality of interpretation magnetic data at low latitudes
Author(s) -
Hai Hong Nguyen,
Nhan Thanh Nhan,
Liet Van Dang,
Thu Ngoc Nguyen
Publication year - 2017
Publication title -
khoa học và công nghệ: tự nhiên
Language(s) - English
Resource type - Journals
ISSN - 2588-106X
DOI - 10.32508/stdjns.v1it4.483
Subject(s) - magnetic anomaly , anomaly (physics) , latitude , magnetic field , magnetization , analytic signal , amplitude , geophysics , signal (programming language) , hilbert transform , operator (biology) , declination , quality (philosophy) , geodesy , physics , geology , computational physics , mathematics , computer science , statistics , signal processing , optics , condensed matter physics , chemistry , spectral density , telecommunications , quantum mechanics , astrophysics , repressor , biochemistry , transcription factor , programming language , radar , gene
Magnetic anomalies are antisymmetrical and often skewed to the location of the sources, because both of the magnetization and ambient field are not directed vertically, so it’s difficult to interpret. For reducing the magnetic anomaly to a symmetrical one – this located on the source of the anomaly – people often use the reduction to the pole (RTP) where the magnetization and ambient field are both directed vertically. However, at low latitudes (an absolute inclination less than 16o30’), the amplitude spectrum of the RTP’s operator was amplified at higher frequencies (short wavelengths) can form a narrow pie-shaped; so it produces artifacts elongated along the direction of the magnetic declination. Therefore, many methods of RTP at low latitudes are given to solve this problem, but most of them are not efficiency. In this paper, we performed enhancing the quality of interpretation of magnetic data at low latitudes by some RTP methods for magnetic data at low latitudes and the analytic signal method using gradient operator and Hilbert transform. This method is applied to a model and to a real magnetic anomaly to find out the best method. Then this method was applied to enhance the quality of magnetic data interpretation in the Southern Vietnam. The result showed that the analytic signal method using Hilbert transform allowed enhancing the quality of interpretatio of magnetic data n at low latitudes is the best.