Numerical modeling of the mount Meager landslide constrained by its force history derived from seismic data

Laurent Moretti 1 Kate Allstadt 2 Anne Mangeney 1, 3 Yann Capdeville 4, 1 Eléonore Stutzmann 1 François Bouchut 5
1 IPGP - Institut de Physique du Globe de Paris
2 Department of Earth and Space Sciences [Seattle]
3 ANGE - Numerical Analysis, Geophysics and Ecology
LJLL - Laboratoire Jacques-Louis Lions, Inria Paris-Rocquencourt
4 LPG - Laboratoire de Planétologie et Géodynamique UMR6112
5 LAMA - Laboratoire d'Analyse et de Mathématiques Appliquées
Abstract : We focus on the 6 August 2010 Mount Meager landslide that occurred in Southwest British Columbia, Canada. This 48.5 Mm3 rockslide that rapidly changed into a debris flow was recorded by over 25 broadband seismic stations. We showed that the waveform inversion of the seismic signal making it possible to calculate the time history of the force applied by the landslide to the ground is very robust and stable, even when using only data from a single station. By comparing this force with the force calculated through numerical modeling of the landslide, we are able to support the interpretation of seismic data made using a simple block model. However, our study gives different values of the friction coefficients involved and more details about the volumes and orientation of the subevents and the flow trajectory and velocity. Our sensitivity analysis shows that the characteristics of the released mass and the friction coefficients all contribute to the amplitude and the phase of the force. Despite this complexity, our study makes it possible to discriminate the best values of all these parameters. Our results suggest that comparing simulated and inverted forces helps to identify appropriate rheological laws for natural flows. We also show that except for the initial collapse, peaks in the low-frequency force related to bends and runup over topography changes are associated with high-frequency generation, possibly due to an increased agitation of the granular material involved
Document type :
Journal articles
Complete list of metadatas
https://hal-upec-upem.archives-ouvertes.fr/hal-01146179
Contributor : François Bouchut <>
Submitted on : Monday, April 27, 2015 - 6:23:51 PM
Last modification on : Tuesday, December 3, 2019 - 5:24:04 PM

Links full text

istex

Identifiers

Collections

UPEC-UPEM | CNRS | INSU | UNIV-NANTES | UPMC | LJLL | INRIA | LAMA_EDP | LAMA_UMR8050 | IPGP | USPC | SORBONNE-UNIVERSITE | UNIV-PARIS7 | SU-SCIENCES | UNIV-ANGERS | LPG | UPEC

Citation

Laurent Moretti, Kate Allstadt, Anne Mangeney, Yann Capdeville, Eléonore Stutzmann, et al.. Numerical modeling of the mount Meager landslide constrained by its force history derived from seismic data. Journal of Geophysical Research : Solid Earth, American Geophysical Union, 2015, 120 (4), pp.2579-2599. ⟨10.1002/2014JB011426⟩. ⟨hal-01146179⟩

Export

BibTeX TEI DC DCterms EndNote

Share

Metrics

Record views

445

Contact

CCSD