Structural and Lithologic Characteristics of the Wenchuan Earthquake Fault Zone and Its Relationship with the Seismic Activity

• 责任者：Wang Huan(China University of Geosciences ; Beijing100083 ; China) ; Li Haibing
• 刊名：Quaternary Sciences
• 出版年：2010
• 卷期：30(4)
• 关键词：汶川地震2008 ; Wenchuan earthquake 2008 ; 断裂带 ; fracture zones ; 龙门山断裂带 ; Longmenshan Fault Zone
• 页码：p.768-778
• 图表：8 illus., 37 refs.
• 分类号：0300
• issnNo：ISSN1001-7410
• isbnNo：CN11-2708/P

Combined with analyses of the drilling cores from the No.1 Well of the Wenchuan Earthquake Fault Scientific Drilling (WFSD-1) Project, the composition features and structure of the Longmenshan fault belt were discussed. The research indicates that Yingxiu-Beichuan fault zone is composed by many small sub-faults (damage zone). According to the gouge statistics of the whole fault zone, seismic events have the obvious tendency towards the foot wall, and the thickness of gouge is proportional to the activity of the fault, indicating that the width of fault zone has the directly relation with the number of times and evolution history of earthquake event. Repeated earthquakes maybe the main cause of formation of Longmenshan Mountain.