Co-seismic landslide topographic analysis based on multi-temporal DEM—A case study of the Wenchuan earthquake

doi:10.1186/2193-1801-2-544

	Co-seismic landslide topographic analysis based on multi-temporal DEM—A case study of the Wenchuan earthquake
	Ren,Zhikun 1; Zhang,Zhuqi 1; Dai,Fuchu 2; Yin,Jinhui 1; Zhang,Huiping 1
刊名	SpringerPlus
	2013-10-17
卷号	2 期号:1
关键词	Co-seismic landslide Topographic PGA Multi-temporal DEM Wenchuan earthquake
ISSN号	2193-1801
DOI	10.1186/2193-1801-2-544
英文摘要	AbstractHillslope instability has been thought to be one of the most important factors for landslide susceptibility. In this study, we apply geomorphic analysis using multi-temporal DEM data and shake intensity analysis to evaluate the topographic characteristics of the landslide areas. There are many geomorphologic analysis methods such as roughness, slope aspect, which are also as useful as slope analysis. The analyses indicate that most of the co-seismic landslides occurred in regions with roughness, hillslope and slope aspect of >1.2, >30, and between 90 and 270, respectively. However, the intersection regions from the above three methods are more accurate than that derived by applying single topographic analysis method. The ground motion data indicates that the co-seismic landslides mainly occurred on the hanging wall side of Longmen Shan Thrust Belt within the up-down and horizontal peak ground acceleration (PGA) contour of 150 PGA and 200?gal, respectively. The comparisons of pre- and post-earthquake DEM data indicate that the medium roughness and slope increased, the roughest and steepest regions decreased after the Wenchuan earthquake. However, slope aspects did not even change. Our results indicate that co-seismic landslides mainly occurred at specific regions of high roughness, southward and steep sloping areas under strong ground motion. Co-seismic landslides significantly modified the local topography, especially the hillslope and roughness. The roughest relief and steepest slope are significantly smoothed; however, the medium relief and slope become rougher and steeper, respectively.
语种	英语
出版者	Springer International Publishing
WOS记录号	BMC:10.1186/2193-1801-2-544
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/64153]
专题	中国科学院地质与地球物理研究所
通讯作者	Ren,Zhikun
作者单位	1.China Earthquake Administration; State Key Laboratory of Earthquake Dynamics, Institute of Geology 2.Chinese Academy of Sciences; Institute of Geology and Geophysics
推荐引用方式 GB/T 7714	Ren,Zhikun,Zhang,Zhuqi,Dai,Fuchu,et al. Co-seismic landslide topographic analysis based on multi-temporal DEM—A case study of the Wenchuan earthquake[J]. SpringerPlus,2013,2(1).
APA	Ren,Zhikun,Zhang,Zhuqi,Dai,Fuchu,Yin,Jinhui,&Zhang,Huiping.(2013).Co-seismic landslide topographic analysis based on multi-temporal DEM—A case study of the Wenchuan earthquake.SpringerPlus,2(1).
MLA	Ren,Zhikun,et al."Co-seismic landslide topographic analysis based on multi-temporal DEM—A case study of the Wenchuan earthquake".SpringerPlus 2.1(2013).