摘要
运用地质地貌调查、地球物理勘探和年代测定等方法,对张家口—宣化盆地的四条主要断裂（张家口断裂、万全断裂、洗马林—水泉断裂和洋河断裂）的空间展布特征和活动性进行分析和研究,获得其活动时代、活动速率等参数。研究表明：上述断裂第四纪期间持续活动,以脆性变形为特征;总体上NW向断裂以高角度的正（或逆）倾滑断层为主,NE或NEE向的断裂以高角度的正断层为主;盆地内活动断裂总体来说活动强烈,多处可见断裂正断运动及左旋走滑运动的地质剖面,早更新世以来单条断层的平均垂直活动速率大于0.070.30mm/a,总垂直活动速率可能达到1.33mm/a。
An active fault leads to disaster in the world,and within the general development of disasters,an active fault＇s frequency and the damage it causes is based on the degree of the fault layer,and gradually intensifies.In recent years,earthquake prediction research and engineering construction developments have vigorously promoted the study of active faults.The Zhangjiakou-Xuanhua Basin,situated in the intersection of the Zhangjiakou-Bohai fault zone and the Shanxi seismic tectonic zone,is a typical Cenozoic extensional fault-depression basin.There are many active faults in this basin,which control the basin＇s development and evolution.However,there is scant research on the active faults in the Zhangjiakou-Xuanhua Basin,and existing research is confined to a few areas.As such,a systematic analysis of this area＇s active faults,the identification of quantitative information regarding active faults,and a better understanding of the characteristics of this basin＇s long-term activity is important in theory and practice.Based on an analysis and reorganization of relevant information from detailed field investigations and shallow seismic exploration,this study describes the geometric characteristics and tectonic activities of the active faults in the Zhangjiakou-Xuanhua Basin.The faults for which there are research data include the Zhangjiakou,Wanquan,Ximalin-Shuiquan,and Yanghe faults.The results showed that：The Zhangjiakou fault strikes mainly to the northwest and east-west,dipping to the north,and extending over 70 km.As a major geological and geomorphologic boundary,the Zhangjiakou fault controls the geotectonic movement in this region,in which its southern side is characterized by Late Quaternary unconsolidated basin deposits,and its northern side by Mesozoic volcano debris and Pre-Mesozoic metamorphic rocks in the form of lower mountains and hills.The Zhangjiakou faults are mainly high-angle inverse strike-slip faults with some normal strike-slip faults.The activity of the central segment of the Zhangjiakou
出处
《地震工程学报》
CSCD
北大核心
2015年第3期702-709,共8页
China Earthquake Engineering Journal
基金
河北省城市活断层探测与地震危险性评价项目(冀发改投资[2007]1684号)
地震行业科研专项(200908001)
关键词
张家口—宣化盆地
活动断裂
构造变形
活动性
Zhangjiakou-Xuanhua Basin
active fault
structural deformation
activity
