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Activity and distribution of geohazards induced by the Lushan earthquake, April 20, 2013
Cui, Peng; Zhang, Jianqiang; Yang, Zongji; Chen, Xiaoqing; You, Yong; Li, Yong
Corresponding AuthorPeng Cui
Source PublicationNATURAL HAZARDS
AbstractAn Ms7.0 earthquake, focal depth 13 km, struck Lushan on April 20, 2013, caused 196 deaths and 21 missing, 13,484 injuries, and affected more than two million people. A field investigation was taken immediately after the quake, and the induced hazards were analyzed in comparison with the Wenchuan earthquake. We have identified 1,460 landslides and avalanches and four dammed lakes, which were generally small and concentrated on high elevation. Avalanches and rockfalls developed in cliffs and steep slopes of hard rocks, including Jinjixia of Baosheng Town and Dayanxia of Shuangshi Town, Lushan, and the K317 section the Xiaoguanzi section north to Lingguan Town along the provincial highway S210. Landslides were relatively less, mainly in moderate and small scales, developing in sandstone, shale, and loose colluviums. Only one single large landslide was observed to turn into debris slide-flow. Dammed lakes were formed by avalanches and landslides, all in small size and of low danger degree. The earthquake-induced hazards distributed in belt on the hanging wall along the faults, and their major controlling factors include tectonics, lithology, structure surface, and landform. More than 99 % landslides were within 30 km to the epicenter, and 678 within 10 km, accounting for 46 % of the total; about 50 % landslides were distributed on slopes between 35A degrees and 55A degrees, and 11 % on slope exceeding 75A degrees; 60 % on slopes at the altitudes between 1,000 and 1,500 m, 77 % on slopes between 900 and 1,500 m; and 24 and 62 % in hard rocks and section between hard and soft rocks, respectively. Compared with the case of Wenchuan earthquake, both the number and extension of landslides and avalanches in Lushan earthquake-affected area are much smaller, only 5.53 % in number and 0.57 % in area. The earthquake has increased the instability of slope and potentiality of landslide and debris flow. Accordingly, the active period is expected to be relatively short comparing with that in Wenchuan earthquake-hit area. However, the insidious and concealed hazards bring difficulty for risk investigation.
KeywordLushan Earthquake LAndslide And Avalanche Debris Flow Dammed Lake Hazard Mitigation
WOS HeadingsScience & Technology ; Physical Sciences
WOS Subject ExtendedGeology ; Meteorology & Atmospheric Sciences ; Water Resources
Indexed BySCI
WOS SubjectGeosciences, Multidisciplinary ; Meteorology & Atmospheric Sciences ; Water Resources
WOS IDWOS:000340490100033
Funding OrganizationKey Project of Chinese Academy of Science(KZZD-EW-05-01) ; Key Project of Natural Science Foundation of China(41030742)
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Cited Times:10[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
AffiliationChinese Acad Sci, Key Lab Mt Hazards & Surface Proc, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Cui, Peng,Zhang, Jianqiang,Yang, Zongji,et al. Activity and distribution of geohazards induced by the Lushan earthquake, April 20, 2013[J]. NATURAL HAZARDS,2014,73(2):711-726.
APA Cui, Peng,Zhang, Jianqiang,Yang, Zongji,Chen, Xiaoqing,You, Yong,&Li, Yong.(2014).Activity and distribution of geohazards induced by the Lushan earthquake, April 20, 2013.NATURAL HAZARDS,73(2),711-726.
MLA Cui, Peng,et al."Activity and distribution of geohazards induced by the Lushan earthquake, April 20, 2013".NATURAL HAZARDS 73.2(2014):711-726.
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