从区域性地震群体活动的韵律性、分幕性及环境因子对地震发生的作用入手，研究了华北地震总形势。
At first from rhythmic rules and episodes of regional seismicity and influence of environment factors on earthquake occurrence, the overall tendency of seismic activity have been studied.
不同的构造环境下地震活动时空分布特征具有较大差异。
In general, st distribution of earthquakes is associated with tectonic Settings.
不同构造环境下不同构造单元地震活动差异性很大。
The seismicity in different blocks under different tectonic conditions is diverse.
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