| 银川盆地西大滩隐伏断层晚第四纪活动特征 |
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| 引用本文： | 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. |
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| 作者姓名： | 雷启云 柴炽章 王银 杜鹏 孟广魁 |
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| 作者单位： | 1. 中国地震局地质研究所,北京 100029;宁夏回族自治区地震局,宁夏银川 750001
2. 宁夏回族自治区地震局,宁夏银川,750001 |
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| 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，地震行业专项 |
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| 摘 要： | 西大滩隐伏断层位于银川盆地北部,是石嘴山市活断层探测项目的目标断层之一。在浅层地震勘探的基础上,通过钻孔联合剖面探测和钻孔样品年龄测试,获得断层上断点埋深、主要标志层断距及沉积年龄等数据,估算了晚第四纪不同时段断层的滑动速率,结合地层变形情况探讨了该断层晚第四纪的活动特征。结果表明,西大滩隐伏断层自12 275±45aB.P.以来没有发生明显活动,属晚更新世末活动断层;晚更新世以来断层活动偏弱,平均滑动速率为0.024mm/a;除断层活动外,伴随着地层倾斜变形;两者均具间歇活动的特点,最小间隔约6 600a,最大间隔期12 275a。
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| 关 键 词： | 西大滩隐伏断层 晚第四纪 滑动速率 钻孔联合剖面 |
Activity Characteristics of Xidatan Buried Fault in Yinchuan Basin in Late Quaternary |
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| LEI?Qi-yun,CHAI?Chi-zhang,WANG?Yin,DU?Peng and MENG Guang-kui.Activity Characteristics of Xidatan Buried Fault in Yinchuan Basin in Late Quaternary[J].Northwestern Seismological Journal,2012,34(2):186-191,208. |
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| Authors: | LEI?Qi-yun CHAI?Chi-zhang WANG?Yin DU?Peng and MENG Guang-kui |
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| Institution: | 1.Institute of Geology,China Earthquake Administration,Beijing 100029,China: 2.Earthquake Administration of Ningxia Hui Autonmomous Region,Yinchuan 750001,China) |
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| 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. |
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| Keywords: | Xidatan buried fault Late Quaternary Slip rate Composite drilling section |
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