引言因土质条件不同而造成的震害差异较早就引起了重视。最初试图通过对地基土条件的调查和勘察来寻找烈度异常的原因。六十年代以来,开始研究层状土对地震反应的影响。并将计算结果与实际记录加以比较,结果表明,土层传递地震波的特征对地震动参数和谱形状都有重要影响。七十年代以来,许多国家采用了按不同场地土分类的平均反 Introduction The difference in earthquake damage caused by different soil conditions has attracted attention earlier. At first, it tried to find the cause of the abnormal intensity by investigating and investigating the conditions of the ground soil. Since the 1960s, the influence of layered soil on seismic response has begun to be studied. Comparing the calculated results with the actual records, the results show that the characteristics of seismic waves transmitted by the soil have important influence on the parameters and spectral shape of the ground motion. Since the 1970s, many countries have adopted the average anti-