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《Progress in Geophysics》 2014-05
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Influencing factors of conversion point coordinate computation analysis

XU Hao;TANG Wei-yu;LIU Jiang-ping;MAO Mao;Changjiang River Scientific Research Institute;Wuhan Kedao Geographical Information Engineering Co.,Ltd;Institute of Geophysics and Geomatics,China University of Geosciences(Wuhan);CCCC Second Harbor Consultants Co.,Ltd;  
The precision of Conversion point coordinate computation is affected directly by S-P velocity ratio,interface depth and angle,all of which are difficult to obtain in actual converted wave data processing.This paper systematically studies the influence of S-P velocity ratio error,interface depth error and interface angle on the conversion point coordinate computation by means of iterative method and ray tracing method.We find that:1)The influence of interface depth error on conversion point coordinate computation is less and the computation result of conversion point coordinate doesn't change with the interface depth increasing.2)The influence of S-P velocity ratio error on the conversion point coordinate computation is greater than that of interface depth and the error of conversion point coordinate increases with the S-P velocity ratio increasing.3)It will cause larger error to conversion point coordinate computation in the situation of dipping interface if using the method for horizontal interface.The larger the dipping angle is,the larger the computation error is.Whereas this influence decreases with the offset increasing.
【Fund】: 国家自然科学基金项目(51209019);; 水利部公益性行业科研专项(201101028-3)联合资助
【CateGory Index】: P631.4
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