地震动幅值沿深度变化研究  

VARIATION OF EARTHQUAKE GROUND MOTION WITH DEPTH

作　　者：胡进军[1] 谢礼立[1] 

机构地区：[1]中国地震局工程力学研究所,中国哈尔滨150080

出　　处：《地震学报》2005年第1期68-78,共11页Acta Seismologica Sinica

基　　金：黑龙江省自然科学基金项目(E0221)资助.

摘　　要：　以美国加州强震观测计划(CSMIP)的 6 个土工台阵和日本 Hosokura矿台阵为研究对象, 以323组三分量地表和地下地震动峰值数据为基础, 按照台阵场地的软硬和土层分布,将其分为基岩、土层和“土层/基岩”台阵. 对于同一类台阵记录的所有地震, 分别按照震级和地表地震动峰值的大小将其分类. 对于同一类台阵的各类地震, 分别对加速度、速度和位移峰值沿深度的变化进行统计分析, 得到沿深度变化的峰值比, 并且用非线性最小平方法, 采用指数衰减模型, 对峰值比沿深度变化曲线进行拟合. 通过对各类场地的各类地震的分析,得到了地震动峰值沿深度变化的初步规律.The variation of ground motion with depth is investigated in this paper, which is essential in determining the seismic design ground motion for embedded structures and pipelines. Firstly the earthquake ground motion on surface and in subsoil recorded by Hosokura Mine array of Japan and six California Strong Motion Instrumentation Program geotechnical arrays of the United States from about fifty moderate and strong earthquakes are described. Then the arrays were classified into three different categories according to their site conditions. Finally the variation law of ground and sub ground motion with depth is established as a result of a nonlinear regression analysis of the above mentioned data. Through comparing the features in different sites, it is concluded that, in general, the amplitude (acceleration, velocity and displacement) of ground motion are decreasing with depth and the attenuation rate is higher in the shallow strata than that in deeper ones.

关 键 词：地下地震动 地震动峰值 峰值比 曲线拟合 

分 类 号：P315.9[天文地球—地震学]