| Titre | Extending the terrestrial depositional record of marine geohazards in coastal NW British Columbia |
| Auteur | Huntley, D; Bobrowsky, P; Goff, J; Chagué, C; Stead, D; Donati, D; Mariampillai, D |
| Source | Subaqueous 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 |
| Année | 2018 |
| Séries alt. | Ressources naturelles Canada, Contribution externe 20190005 |
| Éditeur | Geological Society of London |
| Document | publication en série |
| Lang. | anglais |
| DOI | https://doi.org/10.1144/SP477.4 |
| Media | papier; numérique; en ligne |
| Formats | pdf (Adobe® Reader®) |
| Province | Colombie-Britannique |
| SNRC | 103G/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 |
| Sujets | glissements 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 |
| Illustrations | location maps; geoscientific sketch maps; photographs; tables; stratigraphic columns; geophysical images |
| Programme | Géo-risques marins, Géoscience pour la sécurité publique |
| Diffusé | 2018 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 ID | 314588 |
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