地震加速度相位差谱分布的数字特征  

DIGITAL CHARACTERISTICS OF PHASE DIFFERENCE SPECTRUM DISTRIBUTION OF EARTHQUAKE ACCELEROGRAM

作　　者：朱昱[1] 冯启民[1] 

机构地区：[1]国家地震局工程力学研究所

出　　处：《地震工程与工程振动》1993年第2期30-37,共8页Earthquake Engineering and Engineering Dynamics

摘　　要：本文从地震加速度记录相位差谱的分布具有对数正态分布特征这一计算分析结果出发,进一步研究了基岩场地上加速度记录相位差谱分布的统计平均的数字特征——均值(?)、标准差(?)与震级M、震中距R的统计关系。它可应用于工程实际,从而为合成强度和频率含量两者均为非平稳的人造地震动提供了一个实用性较强的方法。文中利用统计分析结果,给出了不同震级、震中距的拟合目标反应谱的人造地震加速度时程。Based on the results of the phase difference spectrum of earthquake accelerogram having characteristic of logarithmic normal distribution calculated in previous paper,a statistical relation between averaged digital characteristic of the phase difference distribution (mean value λX,standard deviation ξ) and magnitude and epicentral distance is studied, using actual records on the base-rock site. It can be applie'd to practical engineering for generating the artificial accelerogram with nonstationarity of the intensity and frequency content. Using the statistical digital parameters,the artificial accelerograms coinciding with the target spectrum are syn-thetized for different magnitudes and epicentral distances.

关 键 词：地震 加速度 相位差谱 分布 数字 

分 类 号：P315.63[天文地球—地震学]