Sometimes there are foreshocks, but there is nothing about a foreshock that distinguishes it from any other earthquake, so they're not very useful for prediction.
有时会发生前震，但我们并不能区分前震和其他地震，所以它们对于预测地震并不是很有用。
Signal shock and precursory earthquake swarm and foreshock activities always accompany the anomalous space-time patterns of seismic 'ty.
信号震、前兆震群和前震(包括早期前震)的确定应考虑到异常的地震活动时空图象。
This paper discusses the intensity of the earthquake sequences, which include the foreshock, main shock and aftershock.
本文讨论了地震序列中前震、主震和余震的烈度。
The earthquake sequence is foreshock-mainshock-aftershock.
地震序列类型为前震—主震—余震型；
The earthquake sequence is foreshock-mainshock-aftershock.
地震序列类型为前震—主震—余震型；
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