Such a phenomenon has enlightened us on the precursory anomaly of the observed wave characteristics.
这种现象，为观测地震波特性的前兆异常给予了启示。
The trace monitoring and comparative analysis of precursory anomaly is of great significance in seismic regime prediction.
前兆异常的跟踪监测与对比分析，在震情预测中有重要作用。
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.
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。
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