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<p>A catastrophic landslide occurred in the village of Liangshui, Yunnan province, China, resulting in 18 households being buried and 44 deaths on 22 January 2024. It was found that the appearance and ongoing development of cracks in the landslide source area had resulted in the slope reaching a critical state of instability. Through on-site investigations, we discovered that the instability of the landslide rock mass was controlled by two main structural planes. The presence of steep terrain, highly fractured rock formations, and impermeable interlayers created conditions conducive to landslides. The D-InSAR analysis of the deformation recorded within 12 days before the landslide revealed surface line-of-sight (LOS) deformation exceeding 33 mm. Time series DIC results of GaoFen-6 images and Planet images indicate that the landslide source area began to deform in March 2023, accumulating more than 2 m of westward deformation before the failure. Additionally, we identified another potential landslide area near the Liangshui landslide using InSAR and then used DIC to further determine its horizontal deformation field. This study quantifies the spatial-temporal characteristics of ground surface deformation that serve as precursors to the Liangshui landslide and provides an idea for predicting potential landslides.</p>

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Instability precursors of Liangshui landslide detected by integrating InSAR and DIC technologies

  • 期刊论文

  • 发表日期：

    2025年7月22日

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  • Peng Sheng,
  • Fawu Wang,
  • Ye Chen,
  • Bo Zhang,
  • Youqian Feng

摘要

A catastrophic landslide occurred in the village of Liangshui, Yunnan province, China, resulting in 18 households being buried and 44 deaths on 22 January 2024. It was found that the appearance and ongoing development of cracks in the landslide source area had resulted in the slope reaching a critical state of instability. Through on-site investigations, we discovered that the instability of the landslide rock mass was controlled by two main structural planes. The presence of steep terrain, highly fractured rock formations, and impermeable interlayers created conditions conducive to landslides. The D-InSAR analysis of the deformation recorded within 12 days before the landslide revealed surface line-of-sight (LOS) deformation exceeding 33 mm. Time series DIC results of GaoFen-6 images and Planet images indicate that the landslide source area began to deform in March 2023, accumulating more than 2 m of westward deformation before the failure. Additionally, we identified another potential landslide area near the Liangshui landslide using InSAR and then used DIC to further determine its horizontal deformation field. This study quantifies the spatial-temporal characteristics of ground surface deformation that serve as precursors to the Liangshui landslide and provides an idea for predicting potential landslides.