EGU2020-6952, updated on 12 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-6952
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Post-Seismic Shallow Landslide Triggering: Stress States and Hydrology

Ben Leshchinsky1, Peter Lehmann2, and Dani Or3
Ben Leshchinsky et al.
  • 1Oregon State University, United States of America (ben.leshchinsky@oregonstate.edu)
  • 2Swiss Federal Institute of Technology Zurich, Soil and Terrestrial Environmental Physics (STEP)
  • 3Swiss Federal Institute of Technology Zurich, Soil and Terrestrial Environmental Physics (STEP)

Earthquakes are major drivers of landslides. After shaking has passed, landslide activity remains elevated, eventually returning to baseline landslide activity dictated by climactic forcing. While this phenomenon has been observed worldwide, there has been limited quantitative insight towards describing some of the physical drivers behind this occurrence. We describe the role of shear band propagation and permanent changes in the stress state of the soil mantle in post-seismic landslide activity. This this described through a coupled seismic-hydro-mechanical slope failure model, which quantitatively describes the damaged state of the hillslope from shaking. This model enables quantification of the influence of alterations in the stress-states caused by shaking, decreased triggering precipitation, and shear-induced weakening of soil on post-seismic landslide activity. The results provide new insights on the roles of soil depth, hillslope characteristics as well as climate on increased landslide susceptibility and gradual return to baseline conditions.

How to cite: Leshchinsky, B., Lehmann, P., and Or, D.: Post-Seismic Shallow Landslide Triggering: Stress States and Hydrology, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-6952, https://doi.org/10.5194/egusphere-egu2020-6952, 2020

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