成组地震的首发地震前兆异常数量比结束地震多。
The anomalies of the first earthquake were more than those of the last earthquake of group earthquakes.
地倾斜固体潮分析中根据固体潮汐的畸变、趋势、上升、下降、转折等变化特征，提取地震前兆异常信息。
The seismic precursor abnormal information extraction of tilt solid tide usually based on the distortion, tendency, elevation, fall, break and so on characteristics of solid tide.
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.
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