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《Progress in Geophysics》 2012-04
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3D correlation imaging of the vertical gradient of magnetic total field anomaly

SHI Lei1,GUO Liang-hui2,3,MENG Xiao-hong2,3(1.Institute of Geophysics,China Earthquake Administration,Beijing 100081,China; 2.School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083,China; 3.Key Laboratory of Geo-detection(China University of Geosciences,Beijing),Ministry of Education,Beijing 100083,China)  
We present a new correlation imaging approach for the vertical gradient of magnetic total field anomaly for deriving an equivalent magnetic sources distribution of the subsurface.In this approach,we divide the subsurface space into a 3D regular grid,and then at each grid node calculate cross correlation between the vertical gradient of observed magnetic total field anomaly and the vertical gradient of theoretical magnetic total field anomaly due to a magnetic dipole source.The resultant correlation coefficients are used to describe equivalent magnetic dipole distribution in a probability sense.The tests on the synthetic data and the real data show that the equivalent magnetic dipoles distribution derived by the approach basically reflects the causative sources of the subsurface,and also illustrate that its resolution is higher than both that from 3D correlation imaging for magnetic total field anomaly and from 3D correlation imaging based on entropy filter for magnetic total field anomaly.
【Fund】: 国家自然科学基金青年科学基金项目(40904033);; 中央高校基本科研业务费专项资金资助(2010ZY26 2011PY0184);; SinoProbe专项课题(201011039)联合资助
【CateGory Index】: P631.2
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