天津滨海地区覆盖层特征  

Characteristics of overburden layer in Tianjin coastal area and influence on seismic ground motion

作　　者：高武平[1] 陈宇坤[1] 杨菲[1] 刘芳[1] 王志胜[1] 任峰[1] 

机构地区：[1]天津市地震局,中国天津300201

出　　处：《地震地磁观测与研究》2013年第1期57-61,共5页Seismological and Geomagnetic Observation and Research

基　　金：天津市科技创新专项资金项目(07FDZDSF02102);天津市地震局优秀青年基金(091012)共同资助

摘　　要：利用天津滨海地区钻孔地质与剪切波速测试资料,确定该地区不同场地的覆盖层厚度,并分析覆盖层分布特征及地震动影响。结果表明,天津滨海地区覆盖层厚度与地质构造单元凹凸差异有一定对应关系,受基底构造的明显控制;覆盖层厚度差异对地震动峰值与反应谱有一定影响,但假想基岩面的剪切波速变化对地表加速度峰值与反应谱的影响更为明显。Using more than 500 borehole logs and related shear wave velocity test aata, w~ u~ the overburden layer thickness contours and analyzed the characteristics of overburden layer thickness in Tianjin Binhai area and estimated its influence on seismic ground motion. The results show： ①The overburden layer thickness has well correspondence with geological structure elements and shows a good control by the distribution of basement structure. ②The difference of overburden layer thickness has little influence on peak ground acceleration and response spectrum, but the effects of shear wave velocity of imaginary bedrock in surface could not be ignored.

关 键 词：覆盖层厚度 假想基岩面 地震动峰值 剪切波速 基底构造 

分 类 号：P315[天文地球—地震学]