Vol20 No.3: 607-623

【Title】Distribution patterns of landslides triggered by the 2022 M_S 6.8 Luding earthquake, Sichuan, China

【Author】ZHANG Jian-qiang¹;. YANG Zong-ji¹; MENG Qing-kai¹; WANG Jiao¹; HU Kai-heng¹; GE Yong-gang¹*; SU Feng-huan¹ ; ZHAO Bo¹ ; ZHANG Bo¹ ; JIANG Ning^1,2; HUANG Yu^1,3; MING Zai-yang^1,3; ZHANG Yi-fan^1,2; LIU Zhen-xing^2,4; WU Chun-hao^1,2; ZHOU Wen-tao^1,2 ; LIANG Xin-yue^1,2 ; SUN Yu-qing^1,2 ; YANG Lian-bing^1,2 ; YAO Hong-kun^1,2 ; FENG Pei-hua^1,5 ; LIU Jia-li^1,2

【Addresses】1 Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China; 2 University of Chinese Academy of Sciences, Beijing 100049, China; 3 East China University of Technology, Nanchang 330013, China; 4 Institute of Geographic Sciences and Natural Resources Research, Beijing 100101, China; 5 Chongqing Jiaotong University, Chongqing 400074, China

【Corresponding author】GE Yong-gang

【Citation】Zhang JQ, Yang ZJ, Meng QK, et al. (2023) Distribution patterns of landslides triggered by the 2022 MS 6.8 Luding earthquake, Sichuan, China. Journal of Mountain Science 20(3). https://doi.org/10.1007/s11629-022-7772-0

【DOI】https://doi.org/10.1007/s11629-022-7772-0

【Abstract】At 12:52 pm on September 5, 2022, an M_S 6.8 earthquake occurred in Luding County, Sichuan Province, China. Based on high-resolution aerial photographs and satellite imageries obtained after the earthquake, as well as field investigation, a total of 8685 earthquake-triggered landslides (EQTLs) were interpreted. The landslides covered an area of 30.7 km², with a source area of 9.4 km². These EQTLs were mainly distributed in areas with a seismic intensity of VIIIand IX. Most of the landslides were small and medium in size, and their types included landslide, rockfall, and rock slump. Characteristic landslide distributions were found, EQTLs were distributed along the Xianshuihe fault, landslide area decreased gradually with an increased distance to the fault; EQTLs were distributed along the Daduhe River and roads; besides, landslide distribution was associated with ground deformation caused by the earthquake. EQTLs' characteristics indicated that, a large number of EQTLs were located near the foot of the slope; the full area of EQTLs and their source area followed a power function. This study concluded that Luding EQTLs were greater in number and area but relatively smaller in terms of affected area. Investigations on geo-hazards post-earthquake and risk assessment were proposed in the earthquake-stricken area to support the rehabilitation and reconstruction.

【Keywords】2022 Luding earthquake; Earthquake-triggered landslide; Landslide inventory; Distribution patterns