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定义了地震活动模糊熵概念，计算了唐山地震前地震活动模糊熵随时间、空间的变化，发现唐山Ms7.8地震发生前，地震活动模糊墙值下降，唐山Ms7.8地震发生在地震活动模糊摘值较低的地方。这符合大地震前震源区地震活动性从无序趋向有序的规律。地震活动模糊熵把模糊因子与震群活动熵统一起来，比震群活动熵能更突出地反映地震活动异常。
The concept of fuzzy entropy of seismic activity is defined. The change of fuzzy entropy of seismic activity before and after Tangshan earthquake is calculated with time and space. Before the occurrence of Tangshan Ms7.8 earthquake, the value of fuzzy wall value of seismic activity is decreased. The Ms7.8 earthquake in Tangshan occurred in the area of fuzzy seismic activity Lower pick up value. This is in line with the law of seismic activity in the focal region before the major earthquake, from disorder to order. The fuzzy entropy of seismic activity unifies the fuzzy factor with the activity entropy of earthquake swarm, which can more clearly reflect the seismicity anomaly than the earthquake entropy.