| 3种远震P波到时拾取方法的比较及其参数优化 |
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| 引用本文： | 刘畅,靳平,李欣.3种远震P波到时拾取方法的比较及其参数优化[J].地震学报,2018,40(4):419-429. |
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| 作者姓名： | 刘畅 靳平 李欣 |
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| 作者单位： | 中国西安 710024 西北核技术研究所 |
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| 基金项目： | 国家自然科学基金（41474035）资助 |
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| 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。
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| 关 键 词： | 到时拾取 自回归赤池信息准则（AR-AIC）方法 高阶统计量（HOS）方法 累积和（CUSUM）方法 |
| 收稿时间： | 2017-08-15 |
A comparative study on three methods of onset-time determination for teleseismic P arrivals and parameters optimization |
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| Institution: | Northwest Institute of Nuclear Technology，Xi’an 710024，China |
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| 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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