竖向与水平向地震动加速度峰值比统计特征分析  

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] 

机构地区：[1]中国地震局地震研究所,武汉430071 [2]湖北省地震局,武汉430071

出　　处：《地震研究》2010年第2期195-199,共5页Journal of Seismological Research

基　　金：中国地震局地震研究所基金(IS200926044)项目资助

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≤60km)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。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.

关 键 词：竖向地震动 加速度峰值比 对数正态分布 震源机制 

分 类 号：P315.9[天文地球—地震学]