北京地区地震动的三维有限差分模拟  

Three-Dimensional Finite-Difference Simulations of Ground Motions in the Beijing Area

作　　者：高孟潭[1] 俞言祥[1] 张晓梅[1] 吴健[1] 胡平[2] 丁彦慧[2] 

机构地区：[1]中国地震局地球物理研究所,中国北京100081 [2]北京市地震局,中国北京100081

出　　处：《中国地震》2002年第4期356-364,共9页Earthquake Research in China

基　　金：国家重点基础研究发展规划<大陆强震机理与预测>项目 (G19980 40 70 0 )子课题(95 13 0 6 0 4)资助项目

摘　　要：根据北京地区地壳结构和 1679年三河 -平谷 8级地震的研究结果 ,对北京地区进行了三维有限差分地震动模拟研究 ,并研究了北京地区的盆地效应。结果表明 ,盆地效应非常明显 ,在北京盆地内的大部分地区 ,盆地效应的放大系数达到 1 3,在某些地区甚至达到 2 0。将盆地的放大效应与北京市区地表土层的放大效应进行了对比 ,发现它们的放大率为同等水平 ,在部分地区盆地的放大效应更为明显。我国现行的抗震规范中只考虑了地表土层效应的影响 ,由于许多城市位于盆地内 ,并且已经修建或正在修建大量的具有较长自振周期的高层建筑 ,因此 。We performed a three dimensional finite\|difference strong ground motion simulation based on the study of the Beijing basin structure and the results of Sanhe Pinggu earthquake. The basin effects are studied. The result shows that the basin effect is significant. The amplification factor usually rises to 1 3 in the most part of Beijing basin, and over 1 5 in some special region. We compared this effect with the surface soil effect using the drilling data in some sites in and around the Beijing basin. We found that the basin effects are comparable with the surface soil effects, some regions even much bigger than the surface soil effects. In the building code of China, only the surface soil effect is considered. Because many cities situated in the basin region, and so many high rise buildings erupt in these cities, the results are extremely important for the seismic risk management of large cities in China.

关 键 词：北京 三维有限差分模拟 地震动 盆地效应 地震危险性 

分 类 号：P315.9[天文地球—地震学]