基于地震P波初至2 s功率信息的高速铁路地震预警系统快速震级估算方法  

Fast Magnitude Estimation Method for High-speed Railway Earthquake Early Warning System Based on P-Wave 2 s Power Information

作　　者：杨长卫[1] 张凯文 吴东升[1] 张志方 张良[1] 瞿立明 YANG Changwei;ZHANG Kaiwen;WU Dongsheng;ZHANG Zhifang;ZHANG Liang;QU Liming(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Wuhan Group Co.,Ltd.,Wuhan 430012,China;Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中国铁路武汉局集团有限公司,湖北武汉430012 [3]西南交通大学地球科学与环境工程学院,四川成都611756

出　　处：《铁道学报》2024年第7期167-173,共7页Journal of the China Railway Society

基　　金：国家自然科学基金(52078426,52372343);国家铁路局课题研究(KF2023-046);四川省科技计划(2020YJ0253);四川省自然科学基金(2022NSFSC1086)。

摘　　要：震级估算是高速铁路地震预警系统的关键技术参数,更加快速、准确的震级估算模型能够更好地保障人民的生命财产安全。利用日本K-net强震动数据,建立基于地震P波到达后携带功率信息的地震动衰减模型并用于震级估算,并将本文算法与传统算法对比。结果表明,在1~5 s的时间窗下,模型的震级估算误差均明显小于传统的方法,且小震高估现象也明显改善;随着时窗长度的增加,模型的震级估算误差及标准差也逐渐降低,实现率也逐步提升,在1 s的时窗长度下,模型的单台震级估算实现率满足规范要求;对7级以下地震,模型的震级估算实现率可在地震P波到达1 s后满足规范要求;对7级以上地震,模型的震级估算实现率可以在地震P波到达2 s后满足规范要求。Earthquake magnitude estimation is a key technical parameter of the earthquake early warning system of high-speed railway.A more rapid and accurate earthquake magnitude estimation model can better protect the safety of people’s lives and property.In this paper,a ground motion attenuation model based on the power information carried by seismic P wave after the arrival of the P wave was established based on the K-net strong earthquake data from Japan and was used for magnitude estimation.The algorithm proposed in this paper was compared with traditional algorithms.The results show that under the time window of 1~5 s,the magnitude estimation errors of the model are significantly lower than those of the traditional methods,with overestimation of small earthquakes significantly reduced.With the increase of time window length,the error and standard deviation of the magnitude estimation of the model gradually decrease,and the realization rate gradually increases.Under the time window length of 1 s,the realization rate of single magnitude estimation of the model can meet the relevant requirements of the specification.For earthquakes with magnitude less than 7,the realization rate of the magnitude estimation of the model can meet the requirements of the specification after the arrival of P wave for 1 s.For earthquakes with magnitude above 7,the realization rate of the magnitude estimation of the model can meet the requirements of the specification after the arrival of P wave for 2 s.

关 键 词：高速铁路 地震预警 震级估算 

分 类 号：TU443[建筑科学—岩土工程] U211.9[建筑科学—土工工程]