This shows that the effective time interval of earthquake events is only about 1000 years, and the maximum cycle of seismic activity that we are allowed to infer does not exceed 500 years.
说明迄今的地震事件的有效统计间隔仅仅1000年左右，允许我们能够推断出的最大地震活动周期不会超过500年。
There are very sensitive and general concerned questions to the social scientific cycle whether earthquakes could be predicted and the impact of earthquake predictions on social stability.
地震能否预测，以及地震预测对社会安定的影响是当前社科界非常敏感和关注的问题。
The main destruction of constructions suffering from earthquake is brought by the accumulated damage of structures under low cycle fatigue.
建筑结构在地震作用下的破坏主要是由结构的低周疲劳累积损伤引起的。
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