本文介绍一种通过地震图上的简单测量获得地震矩的方法,并由地震波能量公式的简单变换计算应力降。文中用该方法测定了近几年来发生在北三省(河北、山西和内蒙古自治区)交界地区,南三省(河北、山西和河南省)交界地区.以及渤地区共30个中小地震(M_(?)为3.7—5.1)的地震矩和应力降。结果表明,这一方法可较方便地测定一些中小地震的震源参数,从而对区域的地震危险性进行判别 This article presents a method for obtaining the moment of the earth by simple measurements on a seismogram and calculating the stress drop by a simple transformation of the seismic energy formula. In this paper, the method was used to measure the occurrence of M_ (?) In the three provinces (Hebei, Shanxi and Inner Mongolia Autonomous Region), the southern three provinces (Hebei, Shanxi and Henan) in recent years, For the 3.7-5.1) earthquake moment and stress drop. The results show that this method can be more convenient to determine the source parameters of some small and medium earthquakes, so as to discriminate the regional seismic hazard