Extraction and Analysis of Co-seismic Landslides of the Luding Earthquake Based on Optical Images

Xi-xuan BAI , Jiang-cheng CHEN , Shu-wen ZHAN , Bing-qiang ZHANG , Xiao-ya BIAN , Yi YAN , Ai-zhi GUO

Science Technology and Engineering ›› 2025, Vol. 25 ›› Issue (17) : 7061 -7071.

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Science Technology and Engineering ›› 2025, Vol. 25 ›› Issue (17) : 7061-7071 DOI: 10.12404/j.issn.1671-1815.2404549
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Extraction and Analysis of Co-seismic Landslides of the Luding Earthquake Based on Optical Images
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Abstract

In order to better study the spatial distribution of co-seismic landslides of the Luding earthquake, satellite images of Sentinel-2 on July 8 before and October 1 after the 2022 Luding earthquake were acquired, and a study area of 145.6 km2 was obtained after cropping. Supervised classification was performed on the two images using the minimum distance method, maximum likelihood method, and neural network method, respectively, and the classification results were verified by calculating the overall accuracy and Kappa coefficient. Finally, the supervised classification results of the neural network method of the two images were selected for comparison to obtain the change detection results, and a total of 2 247 co-seismic landslides were identified in the study area, covering an area of 22.61 km2, which accounted for 15.53% of the total study area. In the statistics of the slope direction, it was found that the slope direction of the co-seismic landslides radiated in the vertical direction of the originating fault to both sides, indicating that the co-seismic landslides were influenced by the originating fault. The analysis of elevation distribution pointed out that the landslides were mainly concentrated in the elevation range of 1 000 m to 2 000 m, accounting for more than 90% of the total. The analysis with other factors indicated that the landslide events were mainly concentrated near rivers, roads and on mountain slopes. The results of the principal component analysis indicates that the most important factor influencing the incidence of landslides in the same earthquake is the distribution of topographic deposits.

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Luding earthquake / co-seismic landslides / supervised classification / Sentinel-2

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Xi-xuan BAI, Jiang-cheng CHEN, Shu-wen ZHAN, Bing-qiang ZHANG, Xiao-ya BIAN, Yi YAN, Ai-zhi GUO. Extraction and Analysis of Co-seismic Landslides of the Luding Earthquake Based on Optical Images. Science Technology and Engineering, 2025, 25(17): 7061-7071 DOI:10.12404/j.issn.1671-1815.2404549

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