2013年4月20日芦山地震滑坡危险性评估
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摘要
2013年4月20日,四川省芦山县境内发生了Ms7.0强震,地震诱发了大量的滑坡,有些滑坡甚至造成了严重的灾害。本文基于Newmark位移理论,利用芦山地震的强震动记录和地震滑坡点分布数据估算了研究区域斜坡的临界加速度值,并利用经验地震滑坡位移衰减关系计算获得了芦山地震滑坡位移衰减分布,综合考虑了地形坡度及地形起伏度因素,采用极大值标准化方法将三因素进行归一化处理后,在地理信息系统环境下实现了多参数的叠加分析,获得了芦山地震滑坡危险性分布评估图,并通过实际滑坡分布验证了方法的合理性。本方法可为震后地质灾害快速评估以及震后应急救援决策提供参考。
The Lushan earthquake on April 20,2014 induced a large number of landslides and some of the landslides resulted in serious hazards. Based on Newmark method,the critical accelerations were calculated with the data of strong motion records. The map of Lushan seismic landslide displacement attenuation was gained by the experience formula. Taking consideration of slope angle and relief amplitude to achieve a multi-parameter superposition analysis,three factors were normalized by maximum value standardization method in GIS environment. Finally,hazard distribution map of earthquake induced landslide for the Lushan region was obtained. The method is helpful in earthquake damage assessment and emergency relief work.
The Lushan earthquake on April 20,2014 induced a large number of landslides and some of the landslides resulted in serious hazards. Based on Newmark method,the critical accelerations were calculated with the data of strong motion records. The map of Lushan seismic landslide displacement attenuation was gained by the experience formula. Taking consideration of slope angle and relief amplitude to achieve a multi-parameter superposition analysis,three factors were normalized by maximum value standardization method in GIS environment. Finally,hazard distribution map of earthquake induced landslide for the Lushan region was obtained. The method is helpful in earthquake damage assessment and emergency relief work.
引文
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[2]王涛,吴树仁,石菊松,等.基于简化Nemwark位移模型的区域地震滑坡危险性快速评估-以汶川Ms8.0级地震为例[J].工程地质学报,2013,21(1):16-24.WANG Tao,WU Shuren,SHI Jusong,et al.Case study on rapid assessment of regional seismic landslide hazard based on simplifiey Newmark displacement model:Wenchuan Ms8.0 earthquake[J].Journal of Engineering Geology.2013,21(1):16-24.(in Chinese)
[3]周本刚,张裕明.中国西南地区地震滑坡的基本特征[J].西南地震学报,1994,16(1):96-103.ZHOU Bengang,ZHANG Yuming.Some characteristics of earthquake-induced landslide in southwestern China[J].Northwestern seismological journal,1994,16(1):96-103.(in Chinese)
[4]Arias A,A Measure of Earthquake Intensity[C]∥Hansen R.J.Seismic Design for Nuclear Power Plants,MIT Press,Cambridge,Massachusetts,1970:438-483.
[5]王秀英,聂高众,王登伟.利用强震记录分析汶川地震诱发滑坡[J].岩石力学与工程学报,2009,28(11):2369-2379.WANG Xiuying,NIE Gaozhong,WANG Dengwei.Analysis of landslide induced by Wenchuan earthquake by strong motion records[J].Chinese Journal of Rock Mechanics and Engineering.2009,28(11):2369-2379.(in Chinese)
[6]Romeo R.Seismically induced landslide displacements:a predictive model[J].Engineering Geology,2000,58:337-351.
[7]Sabetta F,Pugliese A.Estimation of response spectra southern Apennines,and simulation of nonstationary earthquake ground motion[J].Bulletin Seismological Society of America,1996,86(2):337-352.
[8]郭芳芳,杨农,等.地形起伏度和坡度分析在区域滑坡灾害评介中的应用[J].中国地质,2008,35(1):131-143.GUO Fangfang,YANG Nong,et al.Application of the relief amplitude and slope analysis to regional landslide hazard assessments[J].Geology in China 2008,35(1):131-143.(in Chinese)
[9]涂汉明,刘振东.中国地势起伏度研究[J].测绘学报,1991,20(4):311-319.TU Hanming,LIU Zhendong.Study on relief amplitude in China[J].Acta Geodaetica et Cartographic Sinica,1991,20(4):311-319.(in Chinese)
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