Arran M. I., Mangeney A., De Rosny J., Farin M., Toussaint R., Roche Olivier. (2021). Laboratory landquakes : insights from experiments into the high-frequency seismic signal generated by geophysical granular flows. Journal of Geophysical Research : Earth Surface, 126 (5), p. e2021JF006172 [25 p.]. ISSN 2169-9003.
Titre du document
Laboratory landquakes : insights from experiments into the high-frequency seismic signal generated by geophysical granular flows
Année de publication
2021
Auteurs
Arran M. I., Mangeney A., De Rosny J., Farin M., Toussaint R., Roche Olivier
Source
Journal of Geophysical Research : Earth Surface, 2021,
126 (5), p. e2021JF006172 [25 p.] ISSN 2169-9003
Geophysical granular flows exert basal forces that generate seismic signals, which can be used to better monitor and model these severe natural hazards. A number of empirical relations and existing models link these signals' high-frequency components to a variety of flow properties, many of which are inaccessible by other analyses. However, the range of validity of the empirical relations remains unclear and the models lack validation, owing to the difficulty of adequately controlling and instrumenting field-scale flows. Here, we present laboratory experiments investigating the normal forces exerted on a basal plate by dense and partially dense flows of spherical glass particles. We measured the power spectra of these forces and inferred predictions for these power spectra from the models for debris flows' seismic signals proposed by Kean et al. (2015, ), Lai et al. (2018, ), and Farin, Tsai, et al. (2019, ), using Hertz theory to extend Farin, Tsai, et al. (2019)'s models to higher frequencies. Comparison of our observations to these predictions, and to predictions derived from Bachelet (2018) and Bachelet et al. (2021)'s model for granular flows' seismic signals, shows those of Farin, Tsai, et al. (2019)'s "thin-flow" model to be the most accurate, so we examine explanations for this accuracy and discuss its implications for geophysical flows' seismic signals. We also consider the normalization, by the mean force exerted by each flow, of the force's mean squared fluctuations, showing that this ratio varies by 4 orders of magnitude over our experiments, but is determined by the bulk inertial number of the flow.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Géologie et formations superficielles [064]
;
Géophysique interne [066]
Localisation
Fonds IRD [F B010082058]
Identifiant IRD
fdi:010082058
