GEOSCAN, résultats de la recherche

Menu GEOSCAN


TitreLandslides in glaciomarine sediments in and around Lakelse Lake, Northwestern British Columbia
AuteurBlais-Stevens, A; Geertsema, M; Grenier, A
Séries alt.Ressources naturelles Canada, Contribution externe 20170081
ÉditeurGeo Ottawa
RéunionCanadian Geotechnical Society conference - Geo Ottawa; Ottawa; CA; Octobre 1-4, 2017
Documentpublication en série
Lang.anglais
Mediapapier; en ligne; numérique
Formatspdf
ProvinceColombie-Britannique
SNRC103I/07
Lat/Long OENS-129.0000 -128.5000 54.5000 54.2500
Sujetsglissements de terrain; dépôts glaciomarins; glissements de pentes; boues; profils sismiques; épaisseur des sediments lacustres; sediments lacustres; lacs; sedimentation; dépôts lacustres; milieux lacustres; géologie des dépôts meubles/géomorphologie; Santé et sécurité; stratigraphie; sédimentologie
ProgrammeRisques géo marines, Géoscience pour la sécurité publique
LiensOnline - En ligne
Résumé(disponible en anglais seulement)
Lakelse Lake is an 8.7 km long freshwater lake located in the Skeena River watershed, about 10 km south of Terrace in northwestern British Columbia. The lake is surrounded by mountainous terrain flanked by sediments from the last glacial period. Some of the sediments consist of sensitive glaciomarine sediments, making it an ideal area for destructive landslides. The presence of landslide scars nearby and records of past damaging landslides in glaciomarine sediments (May and June 1962) provide evidence of the region's susceptibility to landslides.

Sub-bottom profiling was carried out in 2015 and 2016 to identify historic and pre-historic sublacustrine landslides in order to assess the extent and potential recurrence of events. Results reveal that most deposits consist of draped fine glaciomarine or lacustrine sediments deposited in a quiescent setting. However, intercalated within these deposits are ten separate resolvable landslide deposits at various depths. Evidence of the June 1962 landslide event is visible on the multibeam image of the lake bottom. Dimensions of the landslide deposits range from 10 m to over a 4 km in distance. Thicknesses range from a few centimetres to 10 m. Some of landslide deposits reveal that lateral spreading took place during deposition. Long-term records of landslides provide baseline information to inform decisions related to infrastructure planning.
Résumé(Résumé en langage clair et simple, non publié)
Ceci est un article qui traite de glissements de terrains historiques et pré-historiques dans des argiles sensibles identifies dans des depots lacustres. C'est une region où plusieurs pipelines sont projetés de traverser.
GEOSCAN ID301652