指一定数量，程度不等的小地震，其中没有特别大的，也无增强和减弱的趋势，称为震群。
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另外一个震群于二月末三月初发生在都江堰和彭州之间。
Then there was another swarm at the end of February and early March between Dujiangyan and Pengzhou.
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.
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