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《Progress in Geophysics》 2014-05
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An error analysis of surface wave group velocity measurement

CHEN Hao-peng;ZHU Liang-bao;WANG Qing-dong;YANG Ying-hang;ZHANG Pan;Department of Geophysics,School of Geodesy and Geomatics,Wuhan University;Key Laboratory of Geospace Environment and Geodesy,Ministory of Education,Wuhan University;  
Multiple filter technique and correlation method were used to analysis the error in surface wave group velocity measurement.The result shows that the error correlates with the period and epicentral distance.In order to minimize the error,we shall choose suitable Gaussian filter parameter.The filter parameter should decrease with the increasing period and increase with the increasing epicentral distance.On the basis of previous studies,we give a simple empirical formula of the choosing of the Gaussian filter parameter,in which both the period and epicentral distance are included. When the correlation method is used to measure the group velocity,the spectral amplitude of surface wave changes rapidly with the period and a greater systematic error is produced compared to the one station method,so the instantaneous period correction is more desired to modify the measured dispersion curve.
【Fund】: 国家自然科学基金项目(41374053);; 国家测绘地理信息局测绘基础研究基金资助项目(11-02-01 12-02-06)资助
【CateGory Index】: P315.6
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