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

被引:0
|
作者
Fu BiHong [1 ]
Wang Ping [2 ]
Kong Ping [1 ]
Meng GuoDong [1 ]
Wang Gang [3 ]
Shi PiLong [1 ]
机构
[1] Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China
[2] China Earthquake Adm, Inst Geol, State Key Lab Earthquake Dynam, Beijing 100029, Peoples R China
[3] Chengdu Univ Technol, Chengdu 610059, Peoples R China
关键词
Wenchuan Ms 8.0 earthquake; Coseismic deformation; Slip zone; Fault gouge; Rock-fluid interaction;
D O I
暂无
中图分类号
P5 [地质学];
学科分类号
0709 ; 081803 ;
摘要
Intensive coseismic surface deformation was produced by tire 12 May 2008 Wenchuan Ms 8.0 earthquake along tire preexisting NE-trending Yingxiu-Beichuan and the Guanxian-Anxian faults, in tire 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 similar to 2 cur occurred along the co-seismic surface rupture zone, which suggests that the coseismic slip concentrate in a narrow slip zone of thickness ranging from 0. 5 similar to 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.
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页码:2237 / 2243
页数:7
相关论文
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