Abstract: From the strong earthquake activities since 1500,the seismic ground hazard map in North China is assessed using a deterministic approach method.The seismic sources are represented at a set of grid points located at distances of 0.2? from each other.The main inputs for this computation are earthquake catalogue,source mechanisms,the level of seismic activity and the deep structural models.Synthetic seismograms at each grid point are generated by different sources and traveling paths.The method proposed by Panza(1999)was used in the calculation to obtain the distribution map of the maximum ground motion and design ground acceleration(DGA).In the research area,the highest value of DGA is at east of Beijing,with the value as high as 0.75g.It can be found that the cities of Beijing,Shijiazhuang and Taiyuan are located in the area with the strong seismic ground motion.The synthetic results may give the evidences for studying the distribution features of seismic hazard in the North China region and be helpful to the work for the seismic hazard mitigation.

Key words: seismic ground hazard map, deterministic approach, North China

摘要： 根据1500年以来的地震活动,用确定性方法对华北地区地震地面危害分布图进行了定量计算.震源和研究区域均用网格单元表示,网格点的间距取为0.2°.计算中主要的输入参量为该地区的地震目录、震源机制、地震活动水平、深部结构模型等.各个单元上模拟的理论地震图考虑到了来自不同地点的震源和传播路径的影响.计算获得了华北地区最大地面运动和设计地面加速度(DGA)的分布图.最大DGA值位于北京以东,达0.75g.该结果可对未来华北地区地震危害的分布特征研究和该地区的防震减灾工作提供依据.

关键词: 地震地面危害分布, 定量估算, 华北地区