前兆震群 Precursory earthquake swarm
地震前兆 [地震] earthquake precursor ; omen of earthquake ; precursory information of earthquake
地震预兆 earth tremor ; earthquake precursor
地震的前兆 premonitory symptoms of an earthquake ; portents of earthquake
微观地震前兆 microscopic earthquake precursor
地震征兆 premonitory symptoms
震兆云 earthquake precursor cloud
临震前兆 impending precursor
强震前兆 Precursor of strong earthquake
震兆异常背景 anomalous background of seismic precursor
初步认为荣成震群是一次频发性震群，不是前兆震群。
It is suggested that the swarm might occur frequently and was not a precursory one.
其他许多中国的大地震象海城地震一样，也有类似的前兆震群。
Many other violent earthquakes sofar occurred in China, similar to the Haicheng earthquake, also had precursory earthquake swarms.
应用主成分分析方法构建了前兆震群判别方程，对震群活动的异常特征进行了分析。
The anomalous characteristic of the swarm activity is analyzed using the precursor swarm distinguishing equation constructed by the principal component analysis method.
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