用地脉动研究银川沉积地层的地震波放大特性  

STUDY ON SEISMIC AMPLIFICATION OF SEDIMENT LAYERS IN YINCHUAN BY USING MICROTREMOR

作　　者：何开明[1] 孟广魁[2] 班铁[2] 崔黎明[2] 

机构地区：[1]浙江大学土木系,浙江杭州310027 [2]宁夏回族自治区地震局,宁夏银川750001

出　　处：《西北地震学报》1999年第4期383-388,共6页Northwestern Seismological Journal

摘　　要：根据银川盆地不同厚度覆盖层上的三分向( 东西、南北和垂直) 地脉动测量数据,绘制出水平向振幅谱与垂直向振幅谱的比值曲线.结果表明,谱比曲线上最大峰值处的频率大小显著地反映了覆盖层的薄厚.通过银川市部分房屋自振频率的对比分析认为,该部分房屋在未来地震中将遭受严重破坏.Based on tri component measurement of microtremor on different thickness sediment layers in Yinchuan basin,the curves of ratio of horizontal spectrum to vertical spectrum were drawn.These curves show that the frequency value corresponding to maximum peak obviously reflect the sediment layers' thickness. Comparing the frequency value with predominant frequency of some buildings in Yinchuan,it can be concluded that these buildings would be seriously damaged by future earthquakes.

关 键 词：地脉动 振幅谱比 自振频率 地震波 放大特性 

分 类 号：P315.3[天文地球—地震学]