刘畅, 靳平, 李欣. 2018: 3种远震P波到时拾取方法的比较及其参数优化. 地震学报, 40(4): 419-429. DOI: 10.11939/jass.20170164
引用本文: 刘畅, 靳平, 李欣. 2018: 3种远震P波到时拾取方法的比较及其参数优化. 地震学报, 40(4): 419-429. DOI: 10.11939/jass.20170164
Liu Chang, Jin Ping, Li Xin. 2018: A comparative study on three methods of onset-time determination for teleseismic P arrivals and parameters optimization. Acta Seismologica Sinica, 40(4): 419-429. DOI: 10.11939/jass.20170164
Citation: Liu Chang, Jin Ping, Li Xin. 2018: A comparative study on three methods of onset-time determination for teleseismic P arrivals and parameters optimization. Acta Seismologica Sinica, 40(4): 419-429. DOI: 10.11939/jass.20170164

3种远震P波到时拾取方法的比较及其参数优化

A comparative study on three methods of onset-time determination for teleseismic P arrivals and parameters optimization

  • 摘要: 分析了自回归赤池信息准则(AR-AIC)、高阶统计量(HOS)和累积和(CUSUM)等3种到时拾取方法中参数对远震P波到时估计的影响,以450个远震P波信号为样本集,参考人工拾取到时,以网格搜索方式确定了每种方法的最优参数。之后重新选取信噪比处于2,20区间的100个远震P波信号,用确定最优参数后的3种到时拾取方法估计其P波初至时间,并比较了3种方法对低信噪比远震P波的拾取准确度。结果表明,AR-AIC方法和CUSUM方法对低信噪比远震P波的拾取准确度要优于HOS方法,CUSUM方法的计算速度最快,HOS方法由于其原理的限制更适用于信噪比较大、初动较尖锐的信号。

     

    Abstract: This paper analyzed the effect of parameters on estimation of onset times for teleseismic P waves by AR-AIC (auto-regression Akaike information criterion), HOS (higher order statistics) and CUSUM (cumulative sums) methods. The parameters of each method were optimized in the way of grid searching by taking 450 teleseismic P phases as sample set and the manual picked arrival times as reference. And then 100 teleseismic P phases were reselected with SNR between 2 and 20, and the onset times were estimated by the three methods with optimized parameters, so as to evaluate the accuracy of estimation for low-SNR teleseismic P phases. The results show that the accuracy of estimated phase arrival times by the AR-AIC and CUSUM methods is better than by the HOS method, the calculation speed by the CUSUM method is the fastest, and the HOS method is better applied to high-SNR and sharp onset signals.

     

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