地震预警系统中利用P_d估测PGV的改进方法

Improved Method of Estimating PGV Using P_d for Earthquake Early Warning

针对传统的PGV-P d统计关系进行地震预警时会低估大地震PGV的问题,提出利用P d估测PGV的改进方法。采用汶川地震余震芦山地震主余震及日本熊本地震主余震事件的共314组强地震动记录,进行PGV-P d关系的统计,得到统计关系A;结合统计关系A,利用中国台湾集集地震主震、汶川地震主震163组强地震动记录得到统计关系B和C。与前人的结果进行对比并进行残差分析后认为:统计关系C比B能给出更好的高P d分段估测结果,建议应用PGV-P d方法时,当P d达到一定阈值时,以统计关系A来提供一般PGV估测值,同时以统计关系C来提供高PGV的估测值。

Referring to PGV underestimation of great earthquake by PGV-P d relation during earthquake early warning,we proposed an improved method of estimating PGV using P d.Based on 314 strong ground motion records of the Wenchuan aftershocks,the Lushan earthquake and its aftershocks,the Kumamoto earthquake and its aftershocks,a 3s-10s time window of the relationship between displacement amplitude P d and peak velocity PGV of earthquake is analyzed.Comparing the analysis results with 163 sets of strong ground motion records of the Chi-Chi earthquake and the Wenchuan earthquake,we presents a method for PGV estimation by P d.When P d is greater than a set threshold,two kinds of estimating results,high and general,are given for reference to users and automatic judging systems,and two schemes are designed to give the overestimation results.Through comparison among our relations and previous studies,as well as residual analysis of our relations,we come to the conclusion of a high and general estimation suggestion.