| Title | InSAR investigation of sackung-like features and debris flows in the vicinity of Hawkesbury Island and Hartley Bay, British Columbia, Canada |
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| Author | Huntley, D ;
Rotheram, D; Bobrowsky, P; Lintern, G; MacLeod, R; Brillon, C |
| Source | Slope Stability 2020: Proceedings of the 2020 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering; by Dight, P M (ed.); 2020 p. 207-226, https://doi.org/10.36487/ACG repo/2025 09  Open
Access |
| Image |  |
| Year | 2020 |
| Alt Series | Natural Resources Canada, Contribution Series 20200613 |
| Publisher | Australian Centre for Geomechanics (Perth, Australia) |
| Meeting | Slope Stability 2020: 2020 International Symposium on Slope Stability in Open Pit Mining and Civil Engineering; AU; May 12-14, 2020 |
| Document | serial |
| Lang. | English |
| Media | on-line; digital |
| File format | pdf |
| Province | British Columbia |
| NTS | 93E/04; 93E/05; 93E/12; 93E/13; 93L/04; 103G/01; 103G/02; 103G/07; 103G/08; 103G/09; 103G/10; 103G/15; 103G/16; 103H; 103I/01; 103I/02; 103I/03; 103I/04; 103J/01; 103J/02 |
| Area | Hawkesbury Island; Hartley Bay |
| Lat/Long WENS | -130.7167 -127.6761 54.0847 53.0942 |
| Subjects | marine geology; surficial geology/geomorphology; soils science; geophysics; environmental geology; Nature and Environment; Science and Technology; Health and Safety; coastal environment; fiords;
landslides; debris flows; slumps; creep; slope stability; slope failures; permafrost; climate effects; meteorology; storms; floods; tsunami; deltas; tides; remote sensing; satellite imagery; radar methods; airphoto interpretation; mapping techniques;
geological history; glacial history; deglaciation; tectonic history; isostatic rebound; faulting; bedrock geology; structural features; field work; in-field instrumentation; Infrastructures; Climate change; cumulative effects; synthetic aperture
radar surveys (SAR); Public safety; Phanerozoic; Cenozoic; Quaternary |
| Illustrations | location maps; geoscientific sketch maps; satellite images; photographs; tables; time series |
| Program | Public
Safety Geoscience Terrestrial Landslides |
| Released | 2020 05 01 |
| Abstract | Future development in coastal northwest British Columbia requires safe, secure locations for infrastructure installations and communities. The challenge for managing environmental and infrastructure
protection and site reclamation will be to accommodate future extreme weather events, climate change, and damage from earthquakes, landslides and tsunamis. New insights into the terrestrial and marine geohazards offered by our work will help reduce
the future development risks to governments, resource industries, communities and the environment. SAR imagery captures two debris flow events in the vicinity of Hartley Bay that occurred between September 2017 and January 2018 during fall or winter
storm events. SAR imagery also captures flooding in a nearby lake basin over this period. The extent to which the debris flows detected impacted local watersheds has yet to be determined by ground observations and public consultation. For Hawkesbury
Island and the surrounding area, a provisional InSAR analysis suggests that on short time-scales (< 2 years), the deep-seated, sackung-like bedrock fractures observed on the western flank are stable. These paraglacial features were likely formed by
stress release during debuttressing of side walls, glacio-isostatic rebound, neo-tectonic faulting, and permafrost loss during deglaciation. This finding has implications for landslide and tsunami risk assessments, suggesting the stable western flank
of Hawkesbury Island does not represent a geological hazard to fjord-bound communities, coastal infrastructure, and natural resource activities. |
| Summary | (Plain Language Summary, not published)
Spaceborne satellite remote sensing captures landslides, flooding and stable slopes. This publication implications for landslide and tsunami risk
assessments, suggesting the stable western flank of Hawkesbury Island does not represent a geological hazard to fjord-bound communities, coastal infrastructure, and natural resource activities. |
| GEOSCAN ID | 327876 |
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