周舟,李俊超. 地震预警中地震P波自动捡拾方法[J]. 华北地震科学,2020, 38(4):42-48. doi:10.3969/j.issn.1003−1375.2020. 04.007.
引用本文: 周舟,李俊超. 地震预警中地震P波自动捡拾方法[J]. 华北地震科学,2020, 38(4):42-48. doi:10.3969/j.issn.1003−1375.2020. 04.007.
ZHOU Zhou,LI Junchao. Automatic Identification of Direct P-wave First Motion in Earthquake Early Warning[J]. North China Earthqauke Sciences,2020, 38(4):42-48. doi:10.3969/j.issn.1003−1375.2020.04.007.
Citation: ZHOU Zhou,LI Junchao. Automatic Identification of Direct P-wave First Motion in Earthquake Early Warning[J]. North China Earthqauke Sciences,2020, 38(4):42-48. doi:10.3969/j.issn.1003−1375.2020.04.007.

地震预警中地震P波自动捡拾方法

Automatic Identification of Direct P-wave First Motion in Earthquake Early Warning

  • 摘要: 通过长短时平均(STA/LTA)方法、固定时窗AIC法、长短时平均(STA/LTA)与固定时窗AIC结合法、基于小波系数的W-AIC法等4种方法研究地震初至波P波的自动捡拾,结合所研究的地震记录的特点选择合适的计算参数,通过对比误差发现:长短时平均(STA/LTA)和固定时窗AIC结合法,既避免了长短时平均(STA/LTA)法的将背景噪声误捡拾为初至波的误捡拾,又解决了固定时窗AIC法对初动幅值较小捡拾效果不佳的问题,是较为理想的初至波捡拾方法。

     

    Abstract: Through the combination of the STA/LTA method, the fixed time window AIC method, the STA/LTA method and the AIC criterion, and the W-AIC method, based on the wavelet coefficient, the automatically identification of direct P-wave first motion was studied. Based on the characteristics of the seismic records studied, the appropriate calculation parameters were selected and the error was compared. The results show that: the combination of STA/LTA and AIC criterion, on the one hand, can avoid the error identification of STA/LTA method, and on the other hand, it can solve the problem that the combination of AIC has poor effect on the identification of small initial amplitude, so as to achieve more accurate seismic phase identification.

     

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