本文提出一种利用区域地震台网垂直向位移记录中和最大振幅的比值,由计算层状介质中点源位错的、综合地震图测定小震震源参数的方法。用人工数据检验该测定方法的可行性;并用此方法测定了海城地震(1975年2月4日,M_s=7.3)前震序列震源参数,与其他方法得到的结果作了对比分析。结果表明,本文提出的方法具有需用记录资料少的优点。 In this paper, a method is proposed to determine the parameters of small earthquakes by calculating the ratio of the maximum amplitude to the vertical displacement in the regional seismograph network. The feasibility of this method was tested by artificial data. The source parameters of the Haicheng earthquake (M_s = 7.3) on Haicheng earthquake (February 4, 1975) were compared with those obtained by other methods. The results show that the method proposed in this paper has the advantage of less need to record the data.