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《Progress in Geophysics》 2006-03
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Interface depths inversion of potential field data with variable density model

KE Xiao-ping~(1,2),WANG Yong~1,XU Hou-ze~1(1.Institute of Geodesy and Geophysics,Chinese Academy of Sciences,Wuhan 430077,China;2.Graduate School of the Chinese Academy of Sciences,Beijing 100039,China)  
The constant density model for conventional Moho depths inversion in wave-number domain from gravity data is just an approximate density model.A variable density model with exponential density contrast is used for inverting Moho depths instead of constant density model.The method is introduced and some formulae are derivated for forward calculating gravity anomaly and Moho depths inversion.The Moho depths of Tibet plateau are inverted from gravity data with exponential density model.The inversion result demonstrates that the Moho depths of Tibet plateau are shallow around the edges,and deep at the center.The gradients at the edges are steeper than at the center.The Moho depth of Qiangtang block situated at the central Tibet plateau is 74 km,and changed to 67 km slowly outward,but changed to 50km rapidly at the margins.The variable density model is more suitable for inversion of Moho depths structures than constant density model by comparison of Moho depth from seismic inversion.
【Fund】: 中国科学院知识创新工程重要方向项目(KZCX3-SW-153);; 国家自然科学基金项目(40574033)联合资助
【CateGory Index】: P631.1
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