|Table of Contents|

Pre-failure Displacements of Hanyuan Landslide in Ya'an Area of Sichuan, China Traced by a Coherence-based InSAR Time Series Method(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2022年第04期
Page:
632-640
Research Field:
大地测量、遥感与地学大数据
Publishing date:

Info

Title:
Pre-failure Displacements of Hanyuan Landslide in Ya'an Area of Sichuan, China Traced by a Coherence-based InSAR Time Series Method
Author(s):
XU Xiao-xue1; 2;  JI Ling-yun1; 2; 3*;  ZHANG Wen-ting1; 2;  LIU Chuan-jin1; 2
(1. The Second Monitoring and Application Center of China Earthquake Administration, Xi'an 710054, Shaanxi, China; 2. Department of Geological Hazards, National Remote Sensing Center of China, Beijing 100036, China; 3. School of Earth Sciences, Institute of Disaster Prevention, Sanhe 065201, Hebei, China)
Keywords:
landslide;  InSAR technology;  coherence;  time series;  SBAS method;  slope deformation;  deformation tracking;  Sichuan
PACS:
P22
DOI:
10.19814/j.jese.2021.06015
Abstract:
High precision monitoring of landslides is necessary for understanding the kinematic characteristics of landslides and reducing the disasters caused by landslides. Interferometry synthetic aperture radar(InSAR)technology can provide a new technical way for deformation monitoring of landslides before disasters. Due to the serious vegetation coverage environment, the coherence-based InSAR time series method was adopted, and the multi-orbit Sentinel-1 SAR image dataset was used to determine the spatio-temporal motion characteristics of Hanyuan landslide in Ya'an area of Sichuan before the disaster from Oct, 2018 to Aug, 2020. Combined with the LOS deformation of the lifting track, the motion components of the landslide along the aspect were extracted. The results show that the maximum average LOS deformation rate of Hanyuan landslide is 42.1 mm·a-1, and the maximum cumulative deformation before sliding is 97 mm, which undergoes two stages of deformation acceleration and stability; the maximum average deformation rate of landslide along the aspect is 43.9 mm·a-1. In general, the InSAR technology has the potential in tracing the pre-failure displacement of landslide, and the research results provide the latest and relatively complete deformation measurement data for Hanyuan landslide.

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Last Update: 2022-07-30