Calculation of Gravity and Magnetic Source Boundary Based on Anisotropy Normalized Variance

详细信息   

• 责任者：Zhang Henglei (Institute of Geophysics and Geomatics ; China University of Geosciences ; Wuhan 430074 ; China) ; Liu Tianyou
• 刊名：Chinese Journal of Geophysics
• 出版年：2011
• 卷期：54(7)
• 关键词：各向异性 ; anisotropy ; 重力异常 ; gravity anomaly ; 磁异常 ; magnetic anomaly
• 页码：p.1921-1927
• 图表：3 illus., 1 table, 12 refs.
• 分类号：1600
• 出版序号：1014
• issnNo：ISSN0001-5733
• isbnNo：CN11-2074/P

摘要

For the calculation of gravity and magnetic source boundary, the traditional gradient methods are vulnerable to disturbance and the resulting edges may be too cluttered when the field data are affected by noise. Besides, for the weak anomaly, sources tend to interfere with one another and consequently the edges of geological bodies may be impossible to detect. In this paper, we first construct anisotropic Gauss function based on coordinate rotation, then we propose the formula of calculating anisotropy normalized variance to detect source edge, and clarify its geological significance through theoretical analysis. The numerical experiment shows the method is stable and effective. Applications on both synthetic data and aeromagnetic data in mid Yangtze region indicate that anisotropy normalized variance can effectively determine the gravity and magnetic source boundaries, it also can get good results especially for weak anomaly, the results contain high-resolution and rich information, and these will facilitate the integrated interpretation.