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<p>Accurately understanding the spatial distribution of loess landslides triggered by historical earthquakes on the Loess Plateau is critical for landslide risk assessment and prevention. This study focuses on loess landslides induced by the 1654 Tianshui M8.0 earthquake, analyzing 753 such events using remote sensing interpretation and field verification, based on the loess landslide induced by the earthquake database established by Wang Yuanmin from the Institute of Disaster Prevention Science and Technology. Using principal component analysis, we extracted key influencing factors including elevation, lithology, seismic intensity, and land use type, and examined their coupled effects on landslide spatial distribution. Results show that: (1) Landslides are clustered and distributed along faults, mainly in the Lixian-Luojiapu and western Qinling fault zones, with 28.02% within 4000&#xa0;m of faults; (2) All landslides occurred in areas with seismic intensity ≥ IX, showing strong seismic control; (3) Landslide development is negatively correlated with distance to rivers and roads. Controlled by topography, landslides mainly occur in farmland and grassland at 1300–1900&#xa0;m elevation, with 0–30&#xa0;m relief and low residential density.</p>

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Spatial distribution of earthquake-induced landslides in Southern Tianshui Loess area, Gansu Province

  • 期刊论文

  • 发表日期：

    2026年7月30日

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  • Xiaoxia Xu,
  • Wujian Yan,
  • Ruixin Xiao,
  • Xiaofeng Liu

摘要

Accurately understanding the spatial distribution of loess landslides triggered by historical earthquakes on the Loess Plateau is critical for landslide risk assessment and prevention. This study focuses on loess landslides induced by the 1654 Tianshui M8.0 earthquake, analyzing 753 such events using remote sensing interpretation and field verification, based on the loess landslide induced by the earthquake database established by Wang Yuanmin from the Institute of Disaster Prevention Science and Technology. Using principal component analysis, we extracted key influencing factors including elevation, lithology, seismic intensity, and land use type, and examined their coupled effects on landslide spatial distribution. Results show that: (1) Landslides are clustered and distributed along faults, mainly in the Lixian-Luojiapu and western Qinling fault zones, with 28.02% within 4000 m of faults; (2) All landslides occurred in areas with seismic intensity ≥ IX, showing strong seismic control; (3) Landslide development is negatively correlated with distance to rivers and roads. Controlled by topography, landslides mainly occur in farmland and grassland at 1300–1900 m elevation, with 0–30 m relief and low residential density.