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.
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。
3
The main destruction of constructions suffering from earthquake is brought by the accumulated damage of structures under low cycle fatigue.