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TitreExtending the terrestrial depositional record of marine geohazards in coastal NW British Columbia
AuteurHuntley, D; Bobrowsky, P; Goff, J; Chagué, C; Stead, D; Donati, D; Mariampillai, D
SourceSubaqueous mass movements and their consequences: assessing geohazards, environmental implications and economic significance of subaqueous landslides; par Lintern, D G (éd.); Mosher, D C (éd.); Moscardelli, L G (éd.); Bobrowsky, P T (éd.); Campbell, D C (éd.); Chaytor, J D (éd.); Clague, J J (éd.); Georgiopoulou, A (éd.); Lajeunesse, P (éd.); Normandeau, A (éd.); Piper, D J W (éd.); Scherwath, M (éd.); Stacey, C (éd.); Turmel, D (éd.); Geological Society, Special Publication no. 477, 2018 p. 277-292, https://doi.org/10.1144/SP477.4
Année2018
Séries alt.Ressources naturelles Canada, Contribution externe 20190005
ÉditeurGeological Society of London
Documentpublication en série
Lang.anglais
DOIhttps://doi.org/10.1144/SP477.4
Mediapapier; numérique; en ligne
Formatspdf (Adobe® Reader®)
ProvinceColombie-Britannique
SNRC103G/01; 103G/08; 103G/09; 103G/16; 103H; 103I/01; 103I/02; 103I/03; 103I/04; 103J/01
Lat/Long OENS-132.5000 -128.0000 54.2500 53.0000
Sujetsglissements de terrain; glissements de pentes; glissements; coulées de débris; fluage; tsunami; milieu côtièr; inondations; dépôts de tempête; sédiments marins; marais salés; dépôts organiques; tourbe; sols; dépôts glaciaires; tills; moraine frontale; blocs; graviers; sables; silts; argiles; débris; géologie du substratum rocheux; caractéristiques structurales; fractures; tempêtes; milieu sédimentaire; établissement de modèles; secousses séismiques; dégât causés par les tremblements de terre; analyses de la stabilité des pentes; escarpements; effets climatiques; sédiments alluviaux; sédiments glaciomarins; changement climatique; géologie marine; géologie des dépôts meubles/géomorphologie; géologie structurale; géologie de l'environnement; Phanérozoïque; Cénozoïque; Quaternaire
Illustrationslocation maps; geoscientific sketch maps; photographs; tables; stratigraphic columns; geophysical images
ProgrammeGéo-risques marins, Géoscience pour la sécurité publique
Diffusé2018 03 27
Résumé(disponible en anglais seulement)
Recurrent storms, floods, landslides, earthquakes and tsunamis challenge the development of resilient infrastructure and communities in coastal northwestern British Columbia. Vulnerability assessment first requires extended and improved understanding of geohazards in the Pacific Basin to constrain modelling of future events. An investigation of soils and bedrock structures in the Douglas Channel provides insight into the distribution of deposits attributed to geohazards in the region. Newly discovered marine inundation deposits corroborate numerical models and suggest that Pacific-sourced storms and earthquake-triggered tsunamis expend much of their energy in the outer coast and rarely reach far up the mainland fjords. Small-volume folisolic slides and rockfalls do not generate tsunamis of any consequence. In contrast, marine sediments deposited beyond storm berms at the fjord head are a record of local tsunamis generated by large-volume marine slumps. Deep-fractured bedrock mapped upslope from relict submarine features would trigger damaging tsunami waves if rapid failure into the fjord were to occur. The observations above suggest only great earthquakes, large landslides and seasonal storms above a certain threshold volume and impulse energy produce geomorphically significant inundation events. However, even small submarine landslides have tsunamigenic potential in Douglas Channel since they occur in shallow water.
GEOSCAN ID314588