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《Earth Science(Journal of China University of Geosciences)》 2011-02
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Gravity and Magnetic Anomaly Separation Based on Bidimensional Empirical Mode Decomposition

CHEN Jian-guo1,2,XIAO Fan1,2,CHANG Tao1,2 1.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences,Wuhan 430074,China 2.Faculty of Earth Resources,China University of Geosciences,Wuhan 430074,China  
Geological process often experienced a number of causal or complex genetic stages,which often resulted in original gravity and magnetic anomaly composed of various geological elements including background anomaly,and local anomaly which may be caused by deposits,alternation and concealed rocks,etc.,which are associated with mineral exploration and prospecting.It is one of the most difficult issues in mineral prospecting and potential resource assessment as how to separate gravity and magnetic anomaly,which is significant for mineral exploration from original composite anomaly.Empirical mode decomposition (EMD) is considered to be an effective method in superimposed information separation.In this paper,a new bidimensional empirical mode decomposition (BEMD) method is proposed,that is,biharmonic spline interpolation (BSI) instead of general spline interpolation for improving stability.As a case study,gravity and magnetic data in Gejiu,Yunnan,China,have been used to extract local anomaly which could reveal potential information in mineral exploration by multiscale and nonlinear decomposition with BEMD method.It extends the application of empirical mode decomposition.
【Fund】: 国家自然科学基金项目(No.40772197);; 国家高技术研究发展计划“863”项目(No.2006AA06Z113);; “十一·五”国家支撑计划课题(No.2006BAB01A01203);; 教育部创新团队基金(No.IRT0755)
【CateGory Index】: P631.2
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