Thrusting and Detachment Folding of Lushan Earthquake in Front of Longmenshan Mountains
详细信息
- 责任者：Li Yong (State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Zhou Rongjun
- 刊名：Journal of Chengdu University of Technology
- 出版年：2013
- 卷期：40(4)
- 关键词：上冲断层 ; upthrust ; 滑脱构造 ; decollement ; 大震 ; great earthquakes ; 龙门山断裂带 ; Longmenshan Fault Zone
- 页码：p.353-363
- 图表：4 illus., 38 refs.
- 分类号：0300
- issnNo：ISSN1671-9727
- isbnNo：CN51-1634/N
摘要
The tectonic pattern of the Longmenshan mainly is detachment and napping.With apparent seismic activities in recent five years,the Wenchuan(Ms 8.0) earthquake and the Lushan(Ms 7.0) earthquake occurred in the Longmenshan Mountains and its front in 2008 and 2013,respectively.Based on the focal mechanism solution,rupture process,seismic intensity,surface deformation,aftershocks of the Lushan earthquake and active faults on the southern segment of the Longmenshan,the authors divide the southern segment of the Longmenshan and its front into two tectonic deformation belts including the Longmenshan thrusting belt and the frontal propagation belt in this paper.By comparing the differences of tectonic deformation style,active faults and history earthquake between the two belts,the authors put forward two kinds of seismotectonic models.One is the thrusting belt characterized by the napping and detachment and another is the frontal propagation belt characterized by thrusting and detachment folding.By analyzing the seismogenic mechanism of thrusting and detachment folding in the frontal propagation belt during the Lushan earthquake,the authors consider that the Lushan earthquake formed by thrusting and detachment folding in the frontal propagation belt of the Longmenshan.The seismogenic fault of the Lushan earthquake is the Dayi fault,which dips to NW with listric surface and conver over the detachment surface.The detachment surface is just the seismic source layer of the Lushan earthquake.
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