Activity Characteristics of Xidatan Buried Fault in Yinchuan Basin in Late Quaternary

详细信息   

• 责任者：Lei Qiyun(Institute Oeology ; China Earthquake Administration ; Beijing 100029 ; China) ; Chai Chizhang
• 刊名：Northwestern Seismological Journal
• 出版年：2012
• 卷期：34(2)
• 关键词：隐伏构造 ; subsurface structure ; 活动构造 ; active tectonics ; 宁夏 ; Ningxia
• 页码：p.186-191,208
• 图表：illus.,3 tables,19 refs.
• 分类号：0300
• issnNo：ISSN
• isbnNo：CN62-1048/P

摘要

The Xidatan buried fault is located in the north of Yinchuan basin and it is determined as one of buried faults in the active faults detection work of Shizuishan city. Based on the interpretation of seismic exploration for shallow layers, exploration of composite drilling section and core sample dating method are used to obtain some important data, such as depth of fault upper break- ing point, displacements and ages of key mark layer. The result shows that, with the deformation of the key mark layer, Xidatan fault ,which a low slip rate as 0.024 mm/a, was a active fault in late Pleistocene and it’s activity stop after 12 275±45 a B.P.. Not only offsets of the fault but also deformation of the key mark layer is characterized by intermittent activity. If considered these two changes as a whole, the minimum interval is 6 600 a and the maximum is 12 275 a.