四川汶川5.12大地震同震滑动断层泥的发现及意义

付碧宏; 王萍; 孔屏; 郑国东; 王刚; 时丕龙

四川汶川5.12大地震同震滑动断层泥的发现及意义

- 1.
  中国科学院地质与地球物理研究所, 北京 100029
- 2.
  中国地震局地质研究所地震动力学国家重点实验室, 北京 100029
- 3.
  成都理工大学, 成都 610059
基金项目:
国家自然科学基金创新研究群体项目(40721003)、中国科学院知识创新工程重要方向项目(KZCX2-YW-12) 和中国科学院地质与地球物理研究所岩石圈演化国家重点实验室自主研究课题(专0804)资助

修回日期: 2008-09-30

刊出日期: 2008-10-31

Preliminary study of coseismic fault gouge occurred in the slip zone of the Wenchuan Ms 8.0 earthquake and its tectonic implications

- 1.
  Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China
- 2.
  State Key Laboratory of Earthquake Dynamics, Institute of Geology, China Earthquake Administration, Beijing 100029, China
- 3.
  Chengdu University of Technology, Chengdu 610059, China

Revised Date: 30 September 2008

Publish Date: 31 October 2008

摘要

摘要: 2008年汶川8.0级地震沿龙门山断裂带内的映秀—北川断裂和灌县—安县断裂产生了近300 km的同震地表破裂带。震后地质科学考察发现地表变形以逆冲为主,并伴有右旋走滑。地震地表破裂带大多沿古生代碳质泥岩、页岩和三叠系煤系地层内的滑动面出露地表,这些软弱地层为地震破裂带冲到地表提供了超低摩擦滑动带。我们发现在同震垂直和水平位错达6m左右的地表破裂带,地震的同震滑动发生在厚度约0.5~2cm 的狭窄滑动带内,以发育新鲜的灰色断层泥为特征,这些断层泥是地震断层快速滑动过程中岩石—流体相互作用的结果。
- 汶川8.0级大地震 /
- 同震地表变形 /
- 断层滑动面 /
- 断层泥 /
- 岩石－流体相互作用
Abstract: Intensive coseismic surface deformation was produced by the 12 May 2008 Wenchuan Ms 8.0 earthquake along the pre-existing NE-trending Yingxiu-Beichuan and the Guanxian-Anxian faults, in the Longmen Shan fault zone. The post-earthquake geological investigation shows that the most of surface ruptures occurred along the carbonaceous argillite, shale and coal-bearing layers, which are low-frictional layers to form slip interface within the fault zone. We found that fresh fault gouges with a thickness of 1~2 cm occurred along the co-seismic surface rupture zone, which suggests that the coseismic slip concentrated in a narrow slip zone of thickness ranging from 0.5~2 cm although the coseismic vertical and horizontal dislocations are larger than 6 meters. These fresh fault gouges within co-seismic slip zone are resulted from both thermal pressurization and frictional melting during rapid faulting movement at the shallow crust level.
- Wenchuan Ms 8.0 earthquake /
- Coseismic deformation /
- Slip zone /
- Fault gouge /
- Rock-fluid interaction

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四川汶川5.12大地震同震滑动断层泥的发现及意义

Preliminary study of coseismic fault gouge occurred in the slip zone of the Wenchuan Ms 8.0 earthquake and its tectonic implications

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