| 内蒙古包头市区大青山山前断裂地震活动断层初步研究 |
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| 引用本文： | 聂宗笙,任云,刘志明,杜成龙,丛培历.内蒙古包头市区大青山山前断裂地震活动断层初步研究[J].现代地质,2011,25(5):938-957. |
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| 作者姓名： | 聂宗笙 任云 刘志明 杜成龙 丛培历 |
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| 作者单位： | 1. 中国地震局地壳应力研究所,北京,100085
2. 内蒙古自治区包头市地震局,内蒙古包头,014030 |
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| 摘 要： | 通过多年来野外考察及断层活动事件年代测定,现已初步查明,包头市区座落在大青山山前断裂西段全新世地震活动断层上。该地震活动断层展布于山前Ⅱ级或Ⅰ级台地前缘,由一系列地震断层、地震陡坎、地震崩积楔、地震充填楔、地裂缝及沙土液化等地震形变遗迹组成,构成规模较大、连续性好的地震地表破裂带。地震断层呈直线型或宽缓弧形斜列延伸,错断全新统及最新地貌面,为一系列断面向南倾斜的正断层及阶状正断层,断层面平整,具垂直擦痕,断层带往往为砂砾、角砾或沙土充填,显示为主要在张应力作用下断层经历5次活动、正倾滑运动而形成。最新一次活动事件为公元849年地震。根据对全新世地震活动断层的活动特征、活动期次的划分及强震复发间隔的初步研究,以及历史和现今地震活动规律的研究,包头市区地震危险性应该引起相当的关注。
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| 关 键 词： | 大青山山前断裂 全新世地震活动断层 地震地表破裂带 |
Preliminary Study on Seismic Active Faults of the Daqingshan Frontal Fault in Baotou City, Inner Mongolia |
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| NIE Zong-sheng,REN Yun,LIU Zhi-ming,DU Cheng-long,CONG Pei-li.Preliminary Study on Seismic Active Faults of the Daqingshan Frontal Fault in Baotou City, Inner Mongolia[J].Geoscience——Journal of Graduate School,China University of Geosciences,2011,25(5):938-957. |
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| Authors: | NIE Zong-sheng REN Yun LIU Zhi-ming DU Cheng-long CONG Pei-li |
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| Institution: | NIE Zong-sheng1,REN Yun2,LIU Zhi-ming2,DU Cheng-long2,CONG Pei-li2 ( 1.Institute of Crustal Dynamics,China Earthquake Administration,Beijing 100085,China,2.Seismological Bureau of Baotou City,Inner Mongolia Autonomous Region,Baotou,Inner Mongolia 014030,China) |
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| Abstract: | Through several years of field investigation and dating paleoearthquake events on the Daqingshan frontal fault,it is initially obtained that Baotou is situated in the western segment of Holocene fault of the Daqingshan frontal fault,which expands along the frontal borders of terrace I or II and is expressed by a series of seismic deformation,such as seismic faults,fault scarps,colluvial wedges,fissure-fill wedges,ground fissures,and liquefaction,which make up of extensive and continual surface ruptures.The ... |
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| Keywords: | the Daqingshan frontal fault Holocene active fault seismological surface rupture trace |
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