main shock

• 主震,本震

main shock的用法和样例：

例句

1. Aftershocks are generally weaker than the main quake, but buildings that have already been damaged are prone to collapse in an aftershock.
   通常余震比主震弱，但是，在主震中受损的建筑往往因余震倒塌。
2. However, the earliest long-period seismographs recorded dispersive waves with large transverse displacement components in the main tremor.
   但是，最早期的地震记录，就记录下了主震中具有很大横向位移分量的频散波。