Coseismic landslide sediment increased by the“9.5”Luding earthquake,Sichuan,China

作     者：XIONG Jiang CHEN Hua-yong ZENG Lu SU Feng-huan GONG Ling-feng TANG Chen-xiao XIONG Jiang;CHEN Hua-yong;ZENG Lu;SU Feng-huan;GONG Ling-feng;TANG Chen-xiao

作者机构：Key Laboratory of Mountain Hazards and Earth Surface ProcessesInstitute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengdu 610299China Chengdu Geological Survey CenterChina Geological SurveyChengdu 610081China 

出 版 物：《Journal of Mountain Science》 (山地科学学报（英文）)

年 卷 期：2023年第20卷第3期

页      面：624-636页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 081803[工学-地质工程] 070801[理学-固体地球物理学] 07[理学] 08[工学] 0818[工学-地质资源与地质工程] 0708[理学-地球物理学] 

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.U21A2008) the Second Tibetan Plateau Scientific Expedition and Research Program(STEP)(Grant No.2019QZKK0902) Science and Technology Project of Tibet Autonomous Region(Grant No.XZ202101ZD0001G) CAS Light of West China Program。 

主　　题：Luding earthquake Landslide sediment Debris flow activity Remote sensing image 

摘      要：The9.5Luding earthquake(Ms 6.8),which occurred on September 5,2022,has triggered thousands of landslides,and caused coseismic landslide sediment in the mountain basin to increase significantly.After the Luding earthquake,landslide sediment may continue to divert to channels,and increase the activity of debris flows.Importantly,the formation of debris flows can pose a major threat to infrastructure,lives and property.To better understand the landslide sediment that increased by the9.5Luding earthquake and its impact on the activity of debris flows,we mapped the coseismic landslide database using satellite images.A total of9142 landslides with an area of 49.51 km^(2),covering4.81%of the whole basin,were triggered by the Luding earthquake.The coseismic landslides induced by this earthquake are dominated by shallow landslides and are densely distributed in the combined zone of the Xianshuihe fault and the Daduhe fault.Approximately 333.31×10^(6)m^(3)(error:111.43×10^(6)m^(3)/-70.73×10^(6)m^(3))of coseismic landslide sediments were induced by the earthquake in the epicenter,and the landslide materials were concentrated downstream of the basins.In addition.more than 13986.45×10^(4)m^(3)(error:4675.67×10^(4)m^(3)/-2967.92×10^(4)m^(3))of landslide sediment may supply for debris flow occurrence.Simultaneously,the small basins that are distributed near Moxi,Detuo and the junction of the Xianshuihe fault and Daduhe fault are more susceptible to debris flows when rainstorms hit these regions.Therefore,prevention and mitigation measures,early warning,and land use planning should be adopted in advance in these regions.However,from the perspectives of landslide scale and the degree of landslide-channel coupling,the activity or active intensity of debris flows in the Luding earthquake area may be lower than that in the epicenter area of the 2008 Wenchuan earthquake.