Distribution of the related disaster and the causative tectonic of the Minxian-Zhanxian MS6.6 earthquake on July 22, 2013, Gansu, China

作者：Zheng Wen Jun^*; Min Wei; He Wen Gui; Ren Zhi Kun; Liu Xing Wang; Wang Ai Guo; Xu Chong; Li Feng

来源：Seismology and Geology, 2013, 35(3): 604-615.

DOI：10.3969/j.issn.0253-4967.2013.03.014

• Causative tectonics
• Complicated geometry
• Field investigation
• Meizoseismal areas
• Southeastern Gansu
• Strong earthquakes
• Structural deformation
• Structural geometry

On July 22, 2013, the Minxian-Zhanxian MS 6.6 earthquake occurred at the central-northern part of the South-North Seismic Belt. In the area, complicated structural geometries are controlled by major strike-slip fault zones, i.e. the Eastern Kunlun Fault and the Northern Frontal Fault of West Qinling. The distribution of related seismic disasters, namely, the ellipse with its major axis trending NWW, is in good accord with the strike of the Lintan-Tanchang Fault. Severe damages in the meizoseismal area of the Minxian-Zhangxian MS 6.6 earthquake are located within the fault zone. So it is considered that the earthquake related damages are closely related to the complicated geometry of the Lintan-Tanchang Fault, and it also indicates that the earthquake is the outcome of joint action of its secondary faults. Based on field investigations, and by integrating the results of previous studies on active tectonics, structural deformation and geophysical data, it can be inferred that the southward extension of the Northern Frontal Fault of West Qinling and the northeastward extrusion of the Eastern Kunlun Fault in the process of northeastward growth of Tibetan plateau are the main source of tectonic stress. Basic tectonic model is provided for strong earthquake generation on the Lintan-Tanchang Fault.

• 出版日期2013
• 单位中国地震局