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.
综合分析中小地震活动和前兆异常群体演化特征，对于判定中期地震危险区是十分重要的。
It is helpful for judging the emphatic area of medium term earthquake risk by synthetical analysis of seismic activity and the features of precursory anomaly evolution in group.
水化群体异常的演化趋势与地震活动密切相关。
The evolutionary trend of hydrochemical colony anomaly is closely related to seismicities.
水化群体异常的演化趋势与地震活动密切相关。
The evolutionary trend of hydrochemical colony anomaly is closely related to seismicities.
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