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使用甘东南地区三维速度模型,利用三维网格搜索法和双差地震定位法对2013年7月22日甘肃岷县漳县MS6.6地震及其震后三天的余震序列进行了精确定位,结合地质构造资料对本次地震的发震构造进行了初步研究。其结果显示:主震的震中位置为34.54°N,104.189°E,震源深度13.5km;余震震中呈NW或NWW方向分布,与临潭-宕昌断裂的走向基本吻合,主要分布于5～20km的深度,震中在深度剖面上呈SW向;发震断裂为倾向SW的隐伏断层,位于临潭-宕昌断裂NE方向,距临潭-宕昌断裂约20km。
Using the 3D velocity model in the southeast of Gansu Province, the MS6.6 earthquake in Zhang County, Min County, Gansu, and the aftershock sequence of three days after the earthquake were accurately located by using the 3D grid search method and the double-difference seismic location method. Based on the geological structure data, the seismogenic structure of this earthquake was studied. The results show that the epicenter position of the main shock is 34.54 ° N and 104.189 ° E, and the focal depth is 13.5 km. The aftershock epicenter presents a NW or NWW distribution, basically coinciding with the strike of the Linthang-Changtan fault, and is mainly distributed in 5-20 km The epicenter is in the SW direction in the depth profile. The seismogenic fault is a hidden fault with a tendency SW. It is located in the NE direction of the Lintan-Dangchang fault and is about 20 km away from the Lintan-Dangchang fault.