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《Progress in Geophysics》 2013-04
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Constraint interface inversion with variable density model

ZHANG Sheng 1,2,MENG Xiao-hong 1,2(1.Key Laboratory of Geo-detection(China University of Geosciences,Beijing),Ministry of Education,Beijing100083,China;2.School of Geophysics and Information Technology,China University of Geosciences,Beijing100083,China)  
Adding known information to geophysical inversion is an important method to reduce ambiguity,and improve the accuracy of inversion result.Follow this idea,this paper use seismic sounding results as constraints in interface depths inversion with variable density model,the accuracy of inversion result improved.This method has the following features: 1) based on the index variable density model,which is more close to actual density distribution than a constant density model;2) use known depth points as constraints,the inversion accuracy improved;3) introduced the depth weighted function,effective correction interface distortion,so this method is applicable to large fluctuations of the interface;4) combined with frequency domain modeling and spatial domain iterative,improve the computation speed while ensuring inversion convergence.The model test demonstrates the validity of the proposed method,and the method is applied in the Moho depths inversion of eastern section of the China-Mongolia border region,and obtained good results.
【Fund】: 国土资源部“深部探测技术与实验研究专项(Sinoprobe-01-05)”;; “中蒙边境东段深部结构及成矿条件对比研究”项目联合资助
【CateGory Index】: P312
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