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TitreSensitive clay landslide detection and characterization in and around Lakelse Lake, British Columbia, Canada
AuteurGeertsema, M; Blais-Stevens, A; Kwoll, E; Menounos, B; Venditti, J G; Grenier, A; Wiebe, K
SourceSedimentary Geology 2018., (Accès ouvert)
Séries alt.Ressources naturelles Canada, Contribution externe 20182241
ÉditeurElsevier B.V.
Documentpublication en série
Mediapapier; en ligne; numérique
ProgrammeGéo-risques marins, Géoscience pour la sécurité publique
Diffusé2017 12 24
Résumé(disponible en anglais seulement)
The Lakelse Lake area in northwestern British Columbia, Canada, has a long history, and prehistory, of rapid sensitive clay landslides moving on very low gradients. However, until now, many landslides have gone undetected. We use an array of modern tools to identify hitherto unknown or poorly known landslide deposits, including acoustic subbottom profiles, multibeam sonar, and LiDAR. The combination of these methods reveals not only landslide deposits, but also geomorphic and sedimentologic structures that give clues about landslide type and mode of emplacement. LiDAR and bathymetric data reveal the areal extent of landslide deposits as well as the orientation of ridges that differentiate between spreading and flowing kinematics. The subbottom profiles show two-dimensional structures of disturbed landslide deposits, including horst and grabens indicative of landslides classified as spreads. A preliminary computer tomography (CT) scan of a sediment core confirms the structures of one subbottom profile. We also use archival data from the Ministry of Transportation and Infrastructure and resident interviews to better characterize historic landslides. © 2017 The Authors.