Abstract
At 12:52 pm on September 5, 2022, an Ms 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 VIII and 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.
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Acknowledgments
This research was supported by the “Second Tibetan Plateau Scientific Expedition and Research Program (STEP)” (Grant No. 2019QZKK0902) and the Strategic Priority Research Program of the CAS (No. XDA23090203). After the Luding earthquake, the Sichuan Bureau of Surveying, Mapping and Geoinformation obtained aerial photographs of the earthquake-stricken regions and provided them to the emergency team of the Institute of Mountain Hazards and Environment, Chinese Academy of Sciences (CAS). High resolution pre- and post-earthquake satellite images were also provided by the Air and Space Institute, CAS. These remote sensing images supported the completion of the landslide inventory and the analyses of spatial distribution patterns.
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Zhang, Jq., Yang, Zj., Meng, Qk. et al. Distribution patterns of landslides triggered by the 2022 Ms 6.8 Luding earthquake, Sichuan, China. J. Mt. Sci. 20, 607–623 (2023). https://doi.org/10.1007/s11629-022-7772-0
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DOI: https://doi.org/10.1007/s11629-022-7772-0