1. It is a basic fact that earthquake occurrence can be modulated and triggered by the syzygial tide.
   朔望潮触发和调制地震的发生已是一个基本事实。
2. The syzygial tide is that the maximum amplitude period of semi-monthly tide added to the semi-diurnal and full-diurnal tides.
   朔望潮即是半月潮幅度最大时段再迭加半日潮和全日潮。

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