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<p>Landslide chronology reconstruction traditionally relies on an event-response index derived from growth disturbance (GD) recorded by tree rings. This study evaluated the effectiveness of a multiproxy approach for improving reconstructions of landslide chronology in complex environments. An alternative event-response index is proposed which, together with the establishment ages of shade-intolerant tree species, may better account for the varying responses of different species and environmental factors. The method was applied to 12 species of tilted deciduous broad-leaved trees including 2 shade-intolerant species, within the Sansukezawa landslide area (including Landslides 1–4) in the Shirakami Mountains, Japan. Our findings enabled reconstruction of the spatiotemporal evolution of the landslides over ~ 150&#xa0;years, identifying three to four reactivation events per landslide from 1901–1905 to 1996–2000. These events corresponded to episodes of regressive scarp enlargement, toe movement and widespread landslide activity. Although the precise timing of each landslide event could not be determined, the approach enables the reconstruction of landslide chronology with temporal resolutions of 4–21&#xa0;years based on the ages of shade-intolerant tree species, or within five-year intervals using the alternative event-response index.</p>

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Reconstruction of landslide chronology through shade-intolerant tree establishment and an event-response index: a case study of the Sansukezawa landslide, Japan

  • 期刊论文

  • 发表日期：

    2025年10月13日

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  • Reona Kawakami,
  • Ching-Ying Tsou,
  • Yukio Ishikawa

摘要

Landslide chronology reconstruction traditionally relies on an event-response index derived from growth disturbance (GD) recorded by tree rings. This study evaluated the effectiveness of a multiproxy approach for improving reconstructions of landslide chronology in complex environments. An alternative event-response index is proposed which, together with the establishment ages of shade-intolerant tree species, may better account for the varying responses of different species and environmental factors. The method was applied to 12 species of tilted deciduous broad-leaved trees including 2 shade-intolerant species, within the Sansukezawa landslide area (including Landslides 1–4) in the Shirakami Mountains, Japan. Our findings enabled reconstruction of the spatiotemporal evolution of the landslides over ~ 150 years, identifying three to four reactivation events per landslide from 1901–1905 to 1996–2000. These events corresponded to episodes of regressive scarp enlargement, toe movement and widespread landslide activity. Although the precise timing of each landslide event could not be determined, the approach enables the reconstruction of landslide chronology with temporal resolutions of 4–21 years based on the ages of shade-intolerant tree species, or within five-year intervals using the alternative event-response index.