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SONG Jingyuan,LIU Yang,DONG Xiujun,et al. Spatial distribution of earthquake-induced landslide in densely populated area of the Luding 9·5 earthquake[J]. Bulletin of Geological Science and Technology,2025,44(0):1-13 doi: 10.19509/j.cnki.dzkq.tb20230619
Citation: SONG Jingyuan,LIU Yang,DONG Xiujun,et al. Spatial distribution of earthquake-induced landslide in densely populated area of the Luding 9·5 earthquake[J]. Bulletin of Geological Science and Technology,2025,44(0):1-13 doi: 10.19509/j.cnki.dzkq.tb20230619

Spatial distribution of earthquake-induced landslide in densely populated area of the Luding 9·5 earthquake

doi: 10.19509/j.cnki.dzkq.tb20230619
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  • Author Bio:

    E-mail:2990732818@qq.com

  • Corresponding author: E-mail:2990732818@qq.com
  • Received Date: 03 Nov 2023
  • Accepted Date: 05 Dec 2023
  • Rev Recd Date: 05 Dec 2023
  • Available Online: 17 Dec 2023
  • Objective

    Studying the spatial distribution law of earthquake-induced landslides can not only provide an important basis for the investigation of hidden dangers of geological disasters in disaster areas, but also be of great significance for post-disaster reconstruction, post-disaster resettlement and site selection, and geological disaster prevention and control.

    Methods

    Taking the earthquake with Ms6.8 in Luding County, Ganzi, Sichuan Province on September 5, 2022 as an example, firstly, based on the optical image (DOM) with 0.2m resolution and the digital elevation model (DEM) with 0.5 m resolution obtained after the earthquake, the earthquake-induced landslides were interpreted by artificial visual three-dimensional remote sensing, and then combined with field investigation and correction, the final number of earthquake-induced landslides was determined. On this basis, the relationship between the geological background such as topography, geological structure and seismic factors and the distribution of earthquake-induced landslides was analyzed.

    Results

    ①The Luding earthquake event triggered 9248 landslides in the study area of about 680km2, mainly small and medium-sized landslides, and the highest area density of landslides was concentrated in the intersection of Xianshuihe fault, Daduhe fault and Jinping mountain fault. The total landslide area is about 45.57 km2, and the average landslide area can reach 4941m2; ②The distribution of landslides in this earthquake is mainly influenced by PGA and fault structures, and most of them are distributed within the range of PGA> 0.6 g and 1km from both sides of the seismogenic fault; In addition, the development of landslide is negatively related to the distance from water system and road; Locally influenced by topographic factors, it mainly develops at the elevation of 1200-2400 m, the slope is 30-60, and the slope is eastward and southeast, and the stratum lithology is mostly hard rock; ③The relationship between the number and area of landslides and magnitude of Luding earthquake also follows exponential distribution; At the same time, due to the high accuracy of the basic data of this interpretation, the number of earthquake landslides obtained by interpretation is more than that of other documents, with a smaller minimum area and a larger total area.

    Conclusion

    The results obtained in this study have been applied to the post-disaster recovery and reconstruction in Luding earthquake-stricken area.

     

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