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TitleLandslides in glaciomarine sediments in and around Lakelse Lake, Northwestern British Columbia
AuthorBlais-Stevens, A; Geertsema, M; Grenier, A
Alt SeriesNatural Resources Canada, Contribution Series 20170081
PublisherGeo Ottawa
MeetingCanadian Geotechnical Society conference - Geo Ottawa; Ottawa; CA; October 1-4, 2017
Documentserial
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceBritish Columbia
NTS103I/07
AreaLakelse Lake; Terrace
Lat/Long WENS-129.0000 -128.5000 54.5000 54.2500
Subjectssurficial geology/geomorphology; Health and Safety; stratigraphy; sedimentology; landslides; glaciomarine deposits; slope failures; muds; seismic profiles; lake sediment thickness; lake sediments; lakes; deposition; lacustrine deposits; lacustrine environments; Skeena River watershed
ProgramMarine Geohazards, Public Safety Geoscience
LinksOnline - En ligne
AbstractLakelse 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.
Summary(Plain Language Summary, not published)
This is a paper that identifies historical (1962) and pre-historic landslides in sensitive glaciomarine clays deposited in a lake. It is located in an area where pipelines are projected to cross.
GEOSCAN ID301652