用数值模拟方法研究北京盆地对3～10s地震动的放大效应  

Studying on Amplification Effect of Beijing Basin on 3～10 s Ground Motion by Numerical Simulation Method

作　　者：付长华[1] 高孟潭[1] 俞言祥[1] 

机构地区：[1]中国地震局地球物理研究所,北京100081

出　　处：《地震研究》2015年第3期448-460,共13页Journal of Seismological Research

基　　金：中央级公益性科研院所基本科研业务专项--盆地对3~10 s地震动加速度反应谱的放大效应(DQJB12B15);复合方法构建太原市强地面运动(DQJB14C02);中国地震局地震科学联合基金课题--考虑盆地效应的概率地震危险性分析方法研究(A08020)共同资助

摘　　要：以北京盆地为例,针对不同的设定地震,研究了不同震源条件对盆地放大效应的影响。结果表明：尽管震源因素可对计算结果带来一些不确定性,但盆地内沉积物的厚度是控制3~10 s周期段地震动加速度反应谱的主要因素。因此,计算了盆地对3~10 s周期段地震动加速度反应谱的平均放大系数,并通过回归分析得到了平均放大系数与盆地等效沉积物厚度之间的函数关系。最后,结合北京盆地内高层建筑的分布,初步探讨了高层建筑地震致灾风险水平与盆地结构的关系。Taking Beijing Basin as an example,we set up several scenario earthquakes,and study the influence of the different epicenter condition on the basin amplification effect of ground motion. The research result demonstrates that although the different source factor may cause the uncertainty to the calculation result in a certain extent,the basin amplification effect on 3 ~ 10 s ground motion acceleration response spectrum is mainly controlled by the thickness of sediment in basin. Thus,the average basin amplification factor on 3 ~ 10 s ground motion acceleration response spectrum is computed,and the correlation function which is betw een the average amplification factor and equivalent thickness of sediment in basin is analyzed. Finally,according to the distribution of high-rise buildings in Beijing Basin,we preliminarily discuss the relationship betw een risk level of seismic hazard of highrise buildings and basin structure.

关 键 词：北京盆地 盆地放大效应 高层建筑 地震致灾风险水平 

分 类 号：P315.91[天文地球—地震学]