用美国西部强震记录讨论厚覆盖土层峰值加速度的放大效应  

Amplification of PGA on Deep Soft Sites Based on the Digital Records of Strong Motion Obtained in the Western U.S.A.

作　　者：刘峥[1] 石树中 沈建文[3] 

机构地区：[1]同济大学,上海200092 [2]浙江省地震局,浙江杭州310013 [3]上海市地震局,上海200062

出　　处：《西北地震学报》2008年第3期245-248,254,共5页Northwestern Seismological Journal

基　　金：浙江省重点科研社会发展项目(2005C23075)

摘　　要：以美国西部强震观测数据资料为基础,分别建立基岩和厚土层上的峰值加速度衰减规律,探讨厚土层对基岩峰值加速度的放大作用。结论为:平均而言,对美国西部这样的厚土层峰值加速度放大作用不大。但基岩峰值加速度越大,厚土层放大作用越小;震中距越远,厚土层放大作用越大。Based on the digital records of strong motion on deep soft soil sites and bed rock sites in the western U. S. A. , the attenuation laws of PGA on deep soil and bed rock are obtained respectively, and the amplifying effect of the soil is discussed. The results shows that the average amplifying effect of deep soft soil is not large. In detail the larger the PGA on bed rock is, the smaller the amplifying effect of deep soft soil is; the larger the epicentral distance is, the smaller the amplifying effect of deep soft soil is.

关 键 词：深厚土层 土层反应 衰减规律 峰值加速度 强震记录 

分 类 号：P315.9[天文地球—地震学]