"Foreshock" and "aftershock" are relative terms.
答：“前震”和“余震”是两个相关的术语。
The earthquake sequence is foreshock-mainshock-aftershock.
地震序列类型为前震—主震—余震型；
The research on the quiescent foreshock is of great theoretical and practical significance.
寂静地震的研究具有重要的理论与实际意义。
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。
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。
The magnetosheath and foreshock are the key regions which somewhat modify and then transmit the solar wind variations to the Earth's magnetosphere.
磁鞘区和地球弓激波前兆区是影响和改变太阳风波动特性，将太阳风能量传输到地球磁层的关键区域。
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。
On March 11, when the first foreshock struck, my colleague Jeffrey Lewis and I were having lunch with senior industry officials at Japan's controversial Rokkasho Reprocessing Plant.
3月11日，当地震的第一波前震来袭，我和同事杰弗里·刘易斯正与资深工业界高官在日本备受争议的六所村核燃料处理厂里享用午餐。
On March 11, when the first foreshock struck, my colleague Jeffrey Lewis and I were having lunch with senior industry officials at Japan's controversial Rokkasho Reprocessing Plant.
3月11日，当地震的第一波前震来袭，我和同事杰弗里·刘易斯正与资深工业界高官在日本备受争议的六所村核燃料处理厂里享用午餐。
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