西北地震学报2012，Vol.34Issue(2)：186-191,208,7.DOI:10.3969/j.issn.1000-0844.2012.02.0186
银川盆地西大滩隐伏断层晚第四纪活动特征
Activity Characteristics of Xidatan Buried Fault in Yinchuan Basin in Late Quaternary
摘要
Abstract
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 breaking point, displacements and ages of key mark layer. The slip rates of Xidatan fault in different period of late Quaternary are finally estimated. The change of dip angle of key mark layer are found, and then, activity characteristics of Xidatan buried fault are discussed. 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.关键词
西大滩隐伏断层/晚第四纪/滑动速率/钻孔联合剖面Key words
Xidatan buried fault/ Late Quaternary/ Slip rate/ Composite drilling section分类
天文与地球科学引用本文复制引用
雷启云,柴炽章,王银,杜鹏,孟广魁..银川盆地西大滩隐伏断层晚第四纪活动特征[J].西北地震学报,2012,34(2):186-191,208,7.基金项目
全国地震重点监视防御区活断层危险性评价项目(1520930027) （1520930027）
地震行业专项(201008003) （201008003）
