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<p>Strong earthquakes in Chile are often associated with cascading hazards, such as ground shaking, liquefaction, tsunamis, and coseismic landslides. This study set recommendations for preparing earthquake-induced landslide inventories and developing and reporting an updated comprehensive earthquake-triggered landslides inventory of the 2007 M<sub>w</sub> 6.2 shallow crustal Aysén earthquake. 781 landslides were re-mapped over a total area of c.1,350 km<sup>2</sup>, based on unified earthquake-triggered landslide mapping criteria. The total landslide volume is c. 122.3 Mm<sup>3</sup>. 18% of earthquake-induced landslides were concentrated within 0–1&#xa0;km of seismic faults, and 55% within 0–5&#xa0;km. In addition, 53% of the landslides started in the upper quarter of the slope, while over 86% started in the upper half, which suggests that larger ground motions due to topographic site effects influenced the triggering of landslides during the shallow crustal earthquake. Hence, the distance to the rupture plane of faults is a first-order factor in the distribution of landslides together with topographic amplification site effects.</p>

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A revised comprehensive inventory of landslides induced by the 2007 Aysén earthquake, Patagonia

  • 期刊论文

  • 发表日期：

    2025年2月20日

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  • Alejandra Serey,
  • Sergio A. Sepúlveda,
  • William Murphy,
  • Gregory P. De Pascale,
  • David N. Petley

摘要

Strong earthquakes in Chile are often associated with cascading hazards, such as ground shaking, liquefaction, tsunamis, and coseismic landslides. This study set recommendations for preparing earthquake-induced landslide inventories and developing and reporting an updated comprehensive earthquake-triggered landslides inventory of the 2007 Mw 6.2 shallow crustal Aysén earthquake. 781 landslides were re-mapped over a total area of c.1,350 km2, based on unified earthquake-triggered landslide mapping criteria. The total landslide volume is c. 122.3 Mm3. 18% of earthquake-induced landslides were concentrated within 0–1 km of seismic faults, and 55% within 0–5 km. In addition, 53% of the landslides started in the upper quarter of the slope, while over 86% started in the upper half, which suggests that larger ground motions due to topographic site effects influenced the triggering of landslides during the shallow crustal earthquake. Hence, the distance to the rupture plane of faults is a first-order factor in the distribution of landslides together with topographic amplification site effects.