研究中，我们从IRIS DMC搜集了震中距范围在30º-95º的欧洲台阵87个台站所记录的远震P波垂直分量，采用了IRIS提供的震源参数，首先利用IASPEI91速度模型以及几何射线方法计算出震源在震中位置时的理论走时（P波初至）进行时差校正，然后截取了P波初至前5秒和后15秒的波形记录，利用波形互相关计算出“互相关时差”并将其校正。%This study collected the teleseismic P-wave vertical component recorded by 87 stations in Europe array whose earthquake focus is from 30oto 95ofrom the IRIS DMC, according to the earthquake focus parameters provided by IRIS, firstly used IASPEI91 speed model and geometrical ray method to calculate the travel time (P wave beginning to) when the earthquake focus in epicenter for time difference correction, then intercepted the waveform recording in first 5 seconds and after 15 seconds when P wave beginning to, and applied the waveform cross-correlation to calculate and correct the"cross-correlation difference".
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