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本文根据鲜水河断裂带自1900—1981年5级以上地震震中分布、6.5级以上地震的极震区或地震地裂缝带的展布,以及1967—1981年各次强震的余震分布,提出道孚—乾宁间出现缺震段.从弱震活动和地形变资料分析,认为这个缺震段不象是一个蠕动段.因此,可以认为这是一个地震活动空区,至少是一个第一类空区.根据统计关系推断,未来强震的最大震级可达7(1/2)级左右.
According to the distribution of the Xianshuihe fault zone from the epicenter of magnitude 5 above 1900-1981, the distribution of the seismic zone above 6.5 magnitude and the earthquake fissure zone of the Xianshuihe fault zone and the aftershock distribution of every strong earthquake from 1967 to 1981 Daofu - Qianning between the earthquake segment.From the weak earthquakes and terrain deformation data analysis, that this lack of earthquake segment is like a peristalsis segment.Therefore, it can be considered as a seismic activity space, at least a first class According to the statistical relations, the maximum magnitude of strong earthquakes in the future can reach about 7 (1/2) level.