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地基抗震的首要问题，是确定场地地震动参数．地震动参数是否准确，关系地基抗震的安全，也直接影响到能否真实反映上部结构所受的地震作用．笔者在地震危险性分析基础上，得到场地的基岩加速度，按一维波动理论进行土层地震反应分析，给出市区范围内两个设计阶段的分区结果和相应的地震动参数．根据市区建设的需要，将设计反应谱周期延长至５ｓ．
The primary problem of earthquake resistance in foundations is to determine site ground motion parameters. The accuracy of ground motion parameters is related to the earthquake safety of the foundation and it also directly affects whether it can truly reflect the seismic effects of the superstructure. Based on the earthquake risk analysis, the author obtains the bedrock acceleration of the site and analyzes the seismic response of the soil in accordance with the one-dimensional wave theory, and gives the partition results of the two design phases in the urban area and the corresponding ground motion parameters. According to the needs of urban construction, the design response spectrum period was extended to 5s.