Transient Reactivation of a Deep-Seated Landslide by Undrained Loading Captured With Repeat Airborne and Terrestrial Lidar - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2018

Transient Reactivation of a Deep-Seated Landslide by Undrained Loading Captured With Repeat Airborne and Terrestrial Lidar

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Adam M. Booth
  • Function : Author
Justin Mccarley
  • Function : Author
Jason Hinkle
  • Function : Author
Susan Shaw
  • Function : Author
Jean-Paul Ampuero
Michael P. Lamb
  • Function : Author

Abstract

Landslides reactivate due to external environmental forcing or internal mass redistribution, but the process is rarely documented quantitatively. We capture the three-dimensional, 1-m resolution surface deformation field of a transiently reactivated landslide with image correlation of repeat airborne lidar. Undrained loading by two debris flows in the landslide's head, rather than external forcing, triggered reactivation. After that loading, the lower 2 km of the landslide advanced by up to 14 m in 2 years before completely stopping. The displacement field over those 2 years implies that the slip surface gained 1 kPa of shear strength, which was likely accomplished by a negative dilatancy-pore pressure feedback as material deformed around basal roughness elements. Thus, landslide motion can be decoupled from external environmental forcing in cases, motivating the need to better understand internal perturbations to the stress field to predict hazards and sediment fluxes as landscapes evolve.
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insu-03664106 , version 1 (10-05-2022)

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Adam M. Booth, Justin Mccarley, Jason Hinkle, Susan Shaw, Jean-Paul Ampuero, et al.. Transient Reactivation of a Deep-Seated Landslide by Undrained Loading Captured With Repeat Airborne and Terrestrial Lidar. Geophysical Research Letters, 2018, 45, pp.4841-4850. ⟨10.1029/2018GL077812⟩. ⟨insu-03664106⟩
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