| Title | Extending the terrestrial depositional record of marine geohazards in coastal NW British Columbia |
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| Author | 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; by Lintern, D G (ed.); Mosher, D C (ed.); Moscardelli, L G (ed.); Bobrowsky, P T (ed.); Campbell, D C (ed.); Chaytor, J D (ed.); Clague, J J (ed.); Georgiopoulou, A (ed.); Lajeunesse,
P (ed.); Normandeau, A (ed.); Piper, D J W (ed.); Scherwath, M (ed.); Stacey, C (ed.); Turmel, D (ed.); Geological Society, Special Publication no. 477, 2018
p. 277-292, https://doi.org/10.1144/SP477.4 |
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| Year | 2018 |
| Alt Series | Natural Resources Canada, Contribution Series 20190005 |
| Publisher | Geological Society of London |
| Document | serial |
| Lang. | English |
| Media | paper; digital; on-line |
| File format | pdf (Adobe® Reader®) |
| Province | British Columbia |
| NTS | 103G/01; 103G/08; 103G/09; 103G/16; 103H; 103I/01; 103I/02; 103I/03; 103I/04; 103J/01 |
| Area | Kitimat; Kitimaat Village; Hartley Bay; Douglas Channel; Minette Bay; Clio Bay; Drumlummon Bay; Hawkesbury Island |
| Lat/Long WENS | -132.5000 -128.0000 54.2500 53.0000 |
| Subjects | marine geology; surficial geology/geomorphology; structural geology; environmental geology; landslides; slope failures; slumps; debris flows; creep; tsunami; coastal environment; floods; storm deposits;
marine sediments; salt marshes; organic deposits; peat; soils; glacial deposits; tills; moraine, end; boulders; gravels; sands; silts; clays; detritus; bedrock geology; structural features; fractures; storms; depositional environment; modelling;
earthquakes; earthquake damage; slope stability analyses; scarps; climate effects; alluvial sediments; glaciomarine sediments; Risk assessment; Climate change; Phanerozoic; Cenozoic; Quaternary |
| Illustrations | location maps; geoscientific sketch maps; photographs; tables; stratigraphic columns; geophysical images |
| Program | Public Safety
Geoscience Marine Geohazards |
| Released | 2018 03 27 |
| Abstract | 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.
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| GEOSCAN ID | 314588 |
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