文章摘要
李倩,姬计法,焦德成,谭雅丽,花鑫升,酆少英,刘增祺,郭新景.宁夏吴忠地区北部的浅部结构和隐伏断裂——地震反射剖面结果[J].地震工程学报,2019,41(1):147-154. LI Qian,JI Jifa,JIAO Decheng,TAN Yali,HUA Xinsheng,FENG Shaoying,LIU Zengqi,GUO Xinjing.Characterization of Shallow Structures and Buried Faultsin the North of Wuzhong Area, Ningxia Based on Seismic Reflection Profiles[J].China Earthquake Engineering Journal,2019,41(1):147-154.
宁夏吴忠地区北部的浅部结构和隐伏断裂——地震反射剖面结果
Characterization of Shallow Structures and Buried Faultsin the North of Wuzhong Area, Ningxia Based on Seismic Reflection Profiles
投稿时间:2017-08-20  
DOI:10.3969/j.issn.1000-0844.2019.01.147
中文关键词: 隐伏断裂;浅层地震勘探;地壳结构;钻孔地质剖面
英文关键词: buried fault;shallow seismic exploration;crustal structure;drilling geological section
基金项目:《吴忠市活断层探测与地震危险性评价》专题报告之四
作者单位E-mail
李倩 中国地震局地球物理勘探中心, 河南 郑州 450002  
姬计法 中国地震局地球物理勘探中心, 河南 郑州 450002 1317798282@qq.com 
焦德成 宁夏回族自治区地震局, 宁夏 银川 750001  
谭雅丽 中国地震局地球物理勘探中心, 河南 郑州 450002  
花鑫升 中国地震局地球物理勘探中心, 河南 郑州 450002  
酆少英 中国地震局地球物理勘探中心, 河南 郑州 450002  
刘增祺 中国地震局地球物理勘探中心, 河南 郑州 450002  
郭新景 中国地震局地球物理勘探中心, 河南 郑州 450002  
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中文摘要:
      应用浅层地震勘探法对宁夏吴忠地区北部的浅部地壳结构和隐伏活动断裂进行研究。结果表明,该区存在2条隐伏断裂,分别为银川主断层南段和新华桥断层。推测银川主断层南段为近SN走向的W倾正断层,断层下盘地层界面一般呈近水平状展布,而在断层上盘,TQ及其以下的地层界面向断面方向倾伏并显示出逆牵引现象,断层向上错断了第四系内部。钻孔联合地质剖面及浅层地震探测结果共同揭示新华桥断层为一条走向NE,倾向SW的正断层,深、浅地震测线控制的新华桥断层延伸长度9 km左右,向上错断了第四系内部的T02界面。
英文摘要:
      Active faults are not only the original causes of earthquakes but are also the most serious earthquake damage experienced by areas along fault lines. Casualties in areas along fault lines are greater than those in areas on both sides of faults. Thus, active seismic fault exploration and seismic hazard assessment within urban areas are crucial. These approaches can help us understand the characteristics and hazards of active faults in specific areas and enable us to take targeted measures for earthquake prevention and disaster reduction to reduce the severity of urban earthquake disasters. In this work, shallow crustal structures and buried active faults in the northern region of Wuzhong, Ningxia were studied through the shallow seismic exploration method. Several high-resolution shallow seismic reflection lines were deployed to determine the position and depth of active faults and the extension direction, possible activity, and shallow features of buried faults. The results of this study showed that two buried faults exist in the study area:the southern part of the main Yinchuan Fault and Xinhua Bridge Fault. The southern part of the main Yinchuan Fault may be a W-trending normal fault with a nearly NS direction. The strata of the footwall of this fault show a horizontal distribution pattern. In the hanging wall of this fault, layer TQ and the following strata are inclined toward the direction of the fracture surface, which exhibits reverse drag phenomenon. The southern part of the main Yinchuan Fault breaks up the Quaternary Interior. The drilling geological section and the result of shallow seismic exploration jointly revealed that the Xinhua Bridge Fault is a SE-trending normal fault. Deep and shallow seismic data illustrated that the Xinhua Bridge Fault extends for approximately 9 km and breaks up the T02 interface in the Quaternary Interior.
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