【摘要】：基于我國高速鐵路沿線路排列的原位地震監(jiān)測網絡所必需的單臺站預警模式,提出適合高速鐵路單臺站快速準確地震預警的P波與S波復合自動快速識別的理論方法。首先通過極化分析方法分離P波和S波;然后利用改進的短時窗信號平均值與長時窗信號平均值之比的方法初步確定P波與S波的到時范圍;最后通過改良的基于高階統計量的赤池信息量準則算法推導P波與S波的精確到時。整理和分析具有代表性的2008年汶川Ms8.0級地震的主震及余震記錄1 548條,以此對該理論方法進行綜合驗證。通過計算震相拾取率與偏差可知,與既有的方法相比,該理論方法可以實時、準確、快速、有效地對具有復雜的震源、傳播路徑以及場地效應的地震進行預警,能夠滿足高速鐵路單臺站地震預警的嚴格要求。
[Abstract]:Based on the single station early warning mode necessary for the in situ seismic monitoring network arranged along the high speed railway in China, this paper presents a theoretical method for the rapid and accurate automatic recognition of P wave and S wave which is suitable for the fast and accurate earthquake warning of single station in high speed railway. First, P wave and S wave are separated by polarization analysis method, then the time range of P wave and S wave is preliminarily determined by using the improved ratio of short window signal average to long time window signal average. Finally, the accurate time of P-wave and S-wave is derived by the improved algorithm of information quantity criterion based on high-order statistics. In this paper, 1 548 records of the main shock and aftershock of the 2008 Wenchuan Ms8.0 earthquake are collected and analyzed, and the theoretical method is verified synthetically. By calculating the phase pickup rate and deviation, we can know that compared with the existing method, the theoretical method can be used to predict earthquakes with complex source, propagation path and site effect in real time, accurate, fast and effective. Can meet the high-speed railway single station earthquake warning strict requirements.
【作者單位】： 北京交通大學土木建筑工程學院;
【基金】：國家自然科學基金資助項目(51278045);國家自然科學基金高鐵聯合基金重點資助項目(U1434210) 鐵道部科技研究開發(fā)計劃項目(2010G08-C-1)
【分類號】：U238;U298

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