PISHAN MS6.5 EARTHQUAKE OF XINJIANG: A FOLD EARTHQUAKE EVENT IN THE WEST KUNLUN PIEDMONT |
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Authors: | WU Chuan-yong LI Jin LIU Jian-ming HU Wei-hua WU Guo-dong CHANG Xiang-de YAO Yuan XIANG Zhi-yong |
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Institution: | Earthquake Administration of Xinjiang Uygur Autonomous Region, Urumqi 830011, China |
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Abstract: | The Pishan MS6.5 earthquake occurred in the west Kunlun piedmont area. According to the surface deformation data obtained by the Pishan MS6.5 earthquake emergency field investigation team, combined with the positioning accuracy of spatial distribution of aftershocks information, the focal mechanism solutions and deep oil profile data, we think the Pishan MS6.5 earthquake is a typical thrust faulting event, and the seismogenic structure is the Pishan reverse fault-anticline, which did not produced obvious surface fault zone on the surface. In the vicinity of the core of the Pishan anticline, we found some tensional ground fissures whose strikes are all basically consistent with the anticline. We propose that the surface deformation is caused by the folding and uplift of the anticline. The Pishan earthquake is a typical folding earthquake. The tectonic deformation of the west Kunlun piedmont is dominated by the thickening and shortening of the upper crust which is the typical thin-skinned nappe tectonic. The Pishan earthquake occurred in the frontal tectonic belt, the root fault of the nappe structure has not been broken, and we should pay attention to the seismic risk of the Tekilik Fault. |
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Keywords: | Pishan MS6 5 west Kunlun bending moment fault fold earthquake |
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