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本文提出了强震活动的＂免疫性＂概念，详细研究了云南６级以上地震的＂免疫性＂特征。认为一次６级地震发生后３０年内在距震中３０公里范围内再发生６级以上地震的可能性小于５％，一次７级地震发生后３０年内距震中６０公里范围内再次发生６级以上地震的可能性小于１０％，而１００公里范围内发生７级以上地震的可能性不大于２０％。文中给出了不同震级续发地震和先发地震的最小距离与先发地震震级的统计关系。并对地震＂免疫性＂机理进行了初步分析。
In this paper, the concept of “immunity” of strong earthquakes is proposed, and the “immunity” characteristics of earthquakes above M6 in Yunnan Province are studied in detail. It is considered that the probability of another 6 or more earthquakes within 30 kilometers from the epicenter within a period of 30 years after a magnitude 6 earthquake is less than 5%. After a magnitude 7 earthquake occurs within 6 km from the epicenter within 30 years after the epicenter, The probability is less than 10%, while the probability of an earthquake of magnitude 7 or above within 100 km is less than 20%. The statistical relationship between the minimum distance of aftershocks with different magnitudes and the magnitude of the preemptive earthquakes is given in this paper. And the earthquake “immunity” mechanism for a preliminary analysis.