| Citation: |
YANG Chengsheng, LI Xiaoyang, ZHANG Qin, WEI Yunjie, LI Zufeng, ZHU Sainan. Monitoring and Analysis of Post-Earthquake Landslide in Sindhupalchowk District, Nepal Based on InSAR Technology[J]. Geomatics and Information Science of Wuhan University, 2023, 48(10): 1684-1696. DOI: 10.13203/j.whugis20230258
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In 2015, the Mw 7.8 earthquake in Nepal caused landslides and seriously impacted Nepal and its surrounding areas.
In this paper, the Sindhupalchowk area, which is close to the epicenter of the earthquake, is selected as the study area. First, based on the L-band ALOS-2 and C-band Sentinel-1A synthetic aperture radar data, the detection and identification of post-earthquake landslides are carried out by using stacking-InSAR(interferometric synthetic aperture radar) technology. Second, the two-dimensional time series deformation characteristics of a typical landslide are obtained by combining the ascending and descending orbit data and multi-dimensional small baseline subset-InSAR technology.
Combined with optical images, 14 hidden points of landslide are delineated. The main deformation of the typical landslide occurs in the horizontal east-west direction, and the maximum deformation rate is -69 mm/a.
By analyzing the trend and periodic term deformation signals in time series of the typical landslide, it is found that the earthquake has a significant acceleration effect on the landslide movement, and the increase of rainfall makes the landslide displacement show a periodic change from August to November every year. This paper can provide a reference for post-earthquake landslide monitoring research.
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