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通过对2014年8月3日云南省昭通市鲁甸县发生的MS6.5地震的震源机制解、余震空间分布、活动断裂组合样式和区域构造背景等特征的综合分析表明:(1)根据主震及4级以上强余震的震源机制解、余震空间分布、烈度长轴方向,判断本次地震的发震断裂为NW向的包谷垴—小河断裂;(2)根据地表GPS水平运动速率及水平缩短速率的差异性、断裂组合样式和历史余震深度,判断发震断裂具有薄皮-同向差异逆冲型捩断层的特征;(3)包谷垴—小河断裂活动可能主要受深部的“管道流”控制,“管道流”自NW向SE方向运动,在昭通断裂带处受到华南板块的差异阻挡,造成包谷垴—小河断裂西侧管道流运动速率大于东侧管道,从而驱动包谷垴—小河捩断层的左旋滑动,导致了鲁甸地震的发生。
Based on the comprehensive analysis of the focal mechanism solution, the spatial distribution of aftershocks, the assemblage of active faults and the tectonic setting of the MS6.5 earthquake in Ludian County, Zhaotong City, Yunnan Province, on August 3, 2014, it shows that: (1) Earthquakes and strong aftershocks of magnitude 4 above, the spatial distribution of aftershocks and the direction of the major axis of the intensity of the earthquake, and it is determined that the seismogenic fault of this earthquake is a NW-trending valleys-creek fault; (2) According to the GPS horizontal movement rate and level The rate of shortening, the pattern of fracture assemblages and the depth of historical aftershocks, and the characteristics of the epicantal faults with synchronic and synchronic thrust faults are determined. (3) The activity of the valleys and streams may be mainly affected by the deep “ ”Control, “ pipe flow ”from NW to SE direction, at the Zhaotong fault zone by South China plate difference block, resulting in the Valley Valley - west of Xiaohe fault pipe flow velocity greater than the eastern side of the pipeline, which drive Valley - Liaohe slip faults on the left led to the occurrence of the Ludian earthquake.