高速铁路地震预警P波与S波复合自动快速识别的理论方法与应用

发布时间：2019-02-19 15:20

【摘要】：基于我国高速铁路沿线路排列的原位地震监测网络所必需的单台站预警模式,提出适合高速铁路单台站快速准确地震预警的P波与S波复合自动快速识别的理论方法。首先通过极化分析方法分离P波和S波;然后利用改进的短时窗信号平均值与长时窗信号平均值之比的方法初步确定P波与S波的到时范围;最后通过改良的基于高阶统计量的赤池信息量准则算法推导P波与S波的精确到时。整理和分析具有代表性的2008年汶川Ms8.0级地震的主震及余震记录1 548条,以此对该理论方法进行综合验证。通过计算震相拾取率与偏差可知,与既有的方法相比,该理论方法可以实时、准确、快速、有效地对具有复杂的震源、传播路径以及场地效应的地震进行预警,能够满足高速铁路单台站地震预警的严格要求。
[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.
【作者单位】：北京交通大学土木建筑工程学院;
【基金】：国家自然科学基金资助项目(51278045);国家自然科学基金高铁联合基金重点资助项目(U1434210) 铁道部科技研究开发计划项目(2010G08-C-1)
【分类号】：U238;U298

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