宁夏回族自治区西吉县地震诱发型黄土滑坡发育特征与分布规律
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摘要
地震诱发型黄土滑坡是宁夏回族自治区西吉县最严重的地震次生灾害。该区域西南部滑坡规模大,密度高,其主要类型是低角度、高速、远程黄土滑坡。西吉县地震活动处于活跃期,老滑坡在地震、降雨等诱发因素下极易复活,严重威胁当地群众的生命财产安全,阻碍社会、经济的发展。基于西吉县地质灾害详细调查资料,从规模、形成时代、滑体厚度等方面对地震诱发型黄土滑坡进行了分类统计。结合实地调查资料和遥感解译成果,分析了滑坡的边界特征、表部及内部特征、变形特征、滑动特征,并进一步总结了滑坡的空间分布规律和时间分布规律,为地震滑坡的形成机理研究提供了理论基础。
Loess landslide induced by earthquake is a serious secondary disaster in Xiji County of Ningxia Hui Autonomous Region.It has special characters not only in scale but also in density,the major type of which is characterized by low angle,high speed and far distance.Xiji County is in a more active period of seismic activity at present and old landslides may easily revive in the case of continuous rain and heavy rain or earthquake,with a serious threat to people's lives and property and severe influences to local economic construction.Based on detailed field data from geological disasters surveys in the county,a classified statistic of seismic loess landslides are made by size,formation age,thickness of sliding mass and other aspects.Then the boundary characteristic,surface and inner characteristic,deformation characteristic and sliding characteristic of the landslides are analyzed.Furthermore,the spatiotemporal distribution of the landslides are summarized.The research may provide a theoretical basis for the forming mechanisms of the landslides.
Loess landslide induced by earthquake is a serious secondary disaster in Xiji County of Ningxia Hui Autonomous Region.It has special characters not only in scale but also in density,the major type of which is characterized by low angle,high speed and far distance.Xiji County is in a more active period of seismic activity at present and old landslides may easily revive in the case of continuous rain and heavy rain or earthquake,with a serious threat to people's lives and property and severe influences to local economic construction.Based on detailed field data from geological disasters surveys in the county,a classified statistic of seismic loess landslides are made by size,formation age,thickness of sliding mass and other aspects.Then the boundary characteristic,surface and inner characteristic,deformation characteristic and sliding characteristic of the landslides are analyzed.Furthermore,the spatiotemporal distribution of the landslides are summarized.The research may provide a theoretical basis for the forming mechanisms of the landslides.
引文
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[3]Zhou Bengang,Zhang Yuming.Some characteristics ofearthquake-induced landslide in Southwestern China[J].Northwestern Seismological Journal,1994,16(1):95-103.
[4]袁丽侠.宁夏地震诱发黄土滑坡[M].银川:宁夏人民出版社,2005:3-10.
[5]西吉县志编纂委员会.续修西吉县志[M].银川:方志出版社,2006:69-93.
[6]高宇,杨国安,王红英,等.宁夏回族自治区西吉县地质灾害调查与区划报告[R].银川:宁夏国土资源调查监测院,2003:2-3.
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[8]国家地震局兰州地震研究所.1920年海原大地震[M].北京:地震出版社,1980.
[9]卢育霞.宁夏西吉县地震滑坡的地貌特征及其减灾开发对策探讨[J].西北地震学报,2007,29(1):79-83.
[10]殷跃平,张作辰,张茂省,等.滑坡崩塌泥石流灾害详细调查规范(审定稿)[S].北京:中国地质调查局,2005.
[11]尚慧,倪万魁,杜光波,等.黄土滑坡形成机理分析:以宁夏彭阳县为例[J].中国地质灾害与防治学报,2011,22(2):26-33.
[12]国家地震局《鄂尔多斯周缘活动断裂系》课题组.鄂尔多斯周缘活动断裂系[M].北京:地震出版社,1988.
[13]尚慧.宁南山区地质灾害形成机理研究[D].西安:长安大学,2010.
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[15]郭正堂,魏兰英,吕厚远,等.晚第四纪风尘物质成分的变化及其环境意义[J].第四纪研究,1999(1):41-48.
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