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Title:: Analysis of Statistic Characteristics of Peak Ratios in Vertical and Horizontal Ground Motion Acceleration

作者:: 李恒¹; 2; 李井冈¹; 王墩¹; 蔡永建¹; 2; (1.中国地震局地震研究所,武汉 430071; 2.湖北省地震局,武汉 430071)

Author(s):: LI Heng¹; 2; LI Jing-gang¹; WANG Dun¹; CAI Yong-jian¹; 2; (1.Institute of Seismology,CEA,Wuhan 430071,Hubei,China)(2.Earthquake Administration of Hubei Province,Wuhan 430071,Hubei,China)

Keywords:: vertical ground motion; acceleration peak ratio; lognormal distribution; focal mechanism

摘要:: 以强地面运动加速度记录为基础,研究了竖向与水平向加速度峰值比值(V/H)的统计分布特征。结果表明,V/H服从对数正态分布。对记录按震级、震中距、场地条件和震源机制进行分类统计,研究了这些因素对V/H的影响。统计分析结果显示,V/H与震级的关系不明显; V/H随距离的增大而减小,在软土场地上尤为明显; V/H与场地条件有很大关系,在近场(R≤60 km)土层场地要高于基岩场地,而在远场则相反; 震源机制对V/H有较大影响,特别是在近场。

Abstract:: In this paper,the statistic analysis of peak ratios in vertical and horizontal acceleration(V/H)is done by using strong ground motion data.It is shown that V/H obeys the lognormal distribution.Based on the data,the effects of magnitude,epicentral distance,site conditions,and focal mechanism on V/H are analyzed.The results show that the effect of magnitude is inconspicuous,and V/H is reduced as the epicentral distance is increased,especially on soft soil site.In the near-field(R≤60 km),V/H on soil site is bigger than it on rock site,and it is opposite in the far-field.In addition,the focal mechanism affects to V/H greatly,especially in the near-field.