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本文以G-R式(B.Gutenberg等,1949)及G-R修正式(宇津德治,1978)几种不同方法给出华北三个不同时期(1370—1739,1740—1979,1370—1979)震级频度分布参数。华北第三地震期强震(M 7)累计地震应变能较第四期约大一个数量级。华北两期地震活动强度、能量的差异与大区域的地震活动背景及强震主体地带的构造与介质环境不同有关。初步认为华北第四活动期发生最大地震震级约7.8级。
In this paper, three different periods (1370-1739, 1740-1979 and 1370-1979) in North China are given in several different ways with the GR formula (B. Gutenberg et al., 1949) and the GR modified formula (Utzch et al., 1978) Distribution parameters. The cumulative seismic energy of the M7 earthquake during the third quake in North China is about an order of magnitude larger than the fourth one. The differences of seismic activity intensity and energy in North China are related to the background of seismic activity in large area and the tectonic and media environments of strong earthquakes. It is initially believed that the magnitude of the largest earthquake in the fourth active phase of North China is about 7.8.