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Journal articles
Numerical modeling of the mount Meager landslide constrained by its force history derived from seismic data
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
Cited literature [42 references]
https://hal-upec-upem.archives-ouvertes.fr/hal-01146179
Contributor : François Bouchut Connect in order to contact the contributor
Submitted on : Tuesday, June 16, 2020 - 2:42:33 PM
Last modification on : Wednesday, October 20, 2021 - 3:18:54 AM
Contributor : François Bouchut Connect in order to contact the contributor
Submitted on : Tuesday, June 16, 2020 - 2:42:33 PM
Last modification on : Wednesday, October 20, 2021 - 3:18:54 AM
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2014JB011426.pdf
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