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<p>On December 10, 2025, the Huangci loess–mudstone bedding landslide on the Heifangtai terrace, Gansu Province, China, experienced a major reactivation. Field surveys, UAV photogrammetry, and multi-temporal InSAR indicate that progressive creep occurred in the middle and rear portions of the slope along softened Cretaceous mudstone interfaces, while a preserved front-edge locked segment maintained temporary slope stability. Long-term irrigation and gradual softening of the mudstone induced progressive strength degradation. Winter freeze–thaw cycles may serve as short-term triggering conditions for its reactivation. The subsequent failure of the irrigation canal rapidly saturated the front-edge mudstone, inducing fluidization and enlarging the affected zone through hydro-mechanical-thermal coupling. Despite three large-scale events at the Huangci landslide, timely local monitoring and historical hazard knowledge enabled successful early warnings and zero casualties. These observations provide new insights into the inheritance-controlled evolution and stability of loess–mudstone bedding landslides. The results also demonstrate the practical value of integrating remote sensing, UAV surveys, and community-based monitoring for landslide early detection and risk mitigation.</p>

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The reactivated Huangci landslide at the Heifangtai terrace, Gansu Province, China, on December 10, 2025

  • 期刊论文

  • 发表日期：

    2026年4月29日

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  • Yueqiao Yang,
  • Jiewei Zhan,
  • Jianqi Zhuang,
  • Jianbing Peng

摘要

On December 10, 2025, the Huangci loess–mudstone bedding landslide on the Heifangtai terrace, Gansu Province, China, experienced a major reactivation. Field surveys, UAV photogrammetry, and multi-temporal InSAR indicate that progressive creep occurred in the middle and rear portions of the slope along softened Cretaceous mudstone interfaces, while a preserved front-edge locked segment maintained temporary slope stability. Long-term irrigation and gradual softening of the mudstone induced progressive strength degradation. Winter freeze–thaw cycles may serve as short-term triggering conditions for its reactivation. The subsequent failure of the irrigation canal rapidly saturated the front-edge mudstone, inducing fluidization and enlarging the affected zone through hydro-mechanical-thermal coupling. Despite three large-scale events at the Huangci landslide, timely local monitoring and historical hazard knowledge enabled successful early warnings and zero casualties. These observations provide new insights into the inheritance-controlled evolution and stability of loess–mudstone bedding landslides. The results also demonstrate the practical value of integrating remote sensing, UAV surveys, and community-based monitoring for landslide early detection and risk mitigation.