Structural and Lithologic Characteristics of the Wenchuan Earthquake Fault Zone and Its Relationship with the Seismic Activity
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 oft-com:office:smarttags" />