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Characterization and spatial analysis of coseismic landslides triggered by the Luding Ms 6.8 earthquake in the Xianshuihe fault zone, Southwest China

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Abstract

On September 5, 2022, a magnitude Ms 6.8 earthquake occurred along the Moxi fault in the southern part of the Xianshuihe fault zone located in the southeastern margin of the Tibetan Plateau, resulting in severe damage and substantial economic loss. In this study, we established a coseismic landslide database triggered by Luding Ms 6.8 earthquake, which includes 4794 landslides with a total area of 46.79 km2. The coseismic landslides primarily consisted of medium and small-sized landslides, characterized by shallow surface sliding. Some exhibited characteristics of high-position initiation resulted in the obstruction or partial obstruction of rivers, leading to the formation of dammed lakes. Our research found that the coseismic landslides were predominantly observed on slopes ranging from 30° to 50°, occurring at between 1000 m and 2500 m, with slope aspects varying from 90° to 180°. Landslides were also highly developed in granitic bodies that had experienced structural fracturing and strong-to-moderate weathering. Coseismic landslides concentrated within a 6 km range on both sides of the Xianshuihe and Daduhe fault zones. The area and number of coseismic landslides exhibited a negative correlation with the distance to fault lines, road networks, and river systems, as they were influenced by fault activity, road excavation, and river erosion. The coseismic landslides were mainly distributed in the southeastern region of the epicenter, exhibiting relatively concentrated patterns within the IX-degree zones such as Moxi Town, Wandong River basin, Detuo Town to Wanggangping Township. Our research findings provide important data on the coseismic landslides triggered by the Luding Ms 6.8 earthquake and reveal the spatial distribution patterns of these landslides. These findings can serve as important references for risk mitigation, reconstruction planning, and regional earthquake disaster research in the earthquake-affected area.

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Acknowledgments

This research was supported by the National Natural Science Foundation of China project (No. 42372339), and the China Geological Survey Project (Nos. DD20221816, DD20190319). The authors would like to thank to the Chengdu Vertical and Horizontal Dapeng UAV Technology Co., Ltd. for providing filed UAV images for this study. The Mountain Science Data Center (http://www.msdc.ac.cn) from CAS and MWR of China, provided a part of UAV aerial photography and satellite data. We also extend our appreciation to graduate students Liu Ji-xin, Zhao Ning, Li Xiang, and Qiu Zhen-dong from the Institute of Geomechanics, Chinese Academy of Geological Sciences, for their invaluable assistance in the geo-hazards interpretation.

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Field investigations were carried out by GUO Changbao, LI Caihong, YANG Zhihua, NI Jiawei, ZHONG Ning, WANG Meng, YAN Yiqiu, SONG Deguang, ZHANG Yanan, ZHANG Xianbing, WU Ruian, CAO Shichao and SHAO Weiwei. The manuscript was written and revised by GUO Changbao and LI Caihong. All authors read and approved the final manuscript.

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Correspondence to Changbao Guo.

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Conflict of interests: The authors declare no conflicts of interest.

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Guo, C., Li, C., Yang, Z. et al. Characterization and spatial analysis of coseismic landslides triggered by the Luding Ms 6.8 earthquake in the Xianshuihe fault zone, Southwest China. J. Mt. Sci. 21, 160–181 (2024). https://doi.org/10.1007/s11629-023-8291-3

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  • DOI: https://doi.org/10.1007/s11629-023-8291-3

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