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对永登５．８ 级地震序列及近１０ 年来永登—兰州地区的小震活动进行了研究，结果表明：永登５．８ 级地震为孤立型，震前近１０ 年震区一直有小震活动，主震是在小震活动经历了一个增多—加剧—平静的过程后才发生的。历史地震活动资料及地质构造表明，永登地区存在中强地震孕育的背景
The series of the Yongdeng M = 5.8 earthquake sequence and the Yongdeng-Lanzhou area in recent 10 years are studied. The results show that the Yongdeng 5.8 M = Earthquake activity, the main shock occurred after the earthquake activity experienced an increase - exacerbate - calm process. Historical seismic activity data and geological structure show that the background of the occurrence of moderate earthquakes in the Yongdeng area