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Title2021004PGC cruise report: mapping Salish Sea marine geohazards, British Columbia
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorDouglas, KORCID logo; Barrie, J VORCID logo; Dill, T; Fralic, T; Koshure, N
SourceGeological Survey of Canada, Open File 8865, 2022, 46 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediadigital; on-line
File formatreadme
File formatpdf; rtf; xlsx (Microsoft® Excel®)
ProvinceBritish Columbia; Western offshore region
NTS92B; 92C; 92F/01; 92F/07; 92F/08; 92F/09; 92F/10; 92F/11; 92F/14; 92F/15; 92F/15; 92G/02; 92G/03; 92G/04; 92G/05; 92G/06; 92G/07; 92G/10; 92G/11; 92G/12; 92G/13; 92G/14; 92G/15
AreaSalish Sea; Saanich Inlet; Stuart Channel; Cape Lazo; Howe Sound; Burrard Inlet; Haro Strait; Sansum Narrows
Lat/Long WENS-125.2500 -122.5000 50.0000 48.2500
Subjectsmarine geology; structural geology; surficial geology/geomorphology; sedimentology; geophysics; Nature and Environment; Science and Technology; Health and Safety; bedrock geology; structural features; faults; geophysical surveys; acoustic surveys, marine; side-scan sonar; bathymetry; marine sediments; landslides; landslide deposits; pockmarks; 2021004PGC Expedition; Public safety
Illustrationslocation maps; photographs; geoscientific sketch maps; geophysical profiles; tables
ProgramMarine Geoscience for Marine Spatial Planning
Released2022 02 24
AbstractThe Geological Survey of Canada (GSC) undertook marine fieldwork onboard the Canadian Coast Guard Ship (CCGS) Vector to locate and map potential geohazards and geological features in the Salish Sea in the interest of public safety from August 11-18, 2021. This work was conducted under the Natural Resources Canada Marine Geoscience for Marine Spatial Planning (MGMSP) and the Public Safety Geoscience Programs. The GSC had observed multiple potential faults in existing data near Central Haro Strait, Stuart Channel, South of Hornby Island and near Cape Lazo through existing CHIRP and multibeam bathymetry data but required further data to quantify their activity and potential seismic risk (Barrie et al, 2021). In addition to fault activity, the GSC had detected numerous large underwater landslide deposits in Howe Sound and Saanich Inlet. The GSC required further data to constrain volumes and timing of slide activity. In English Bay the origin and evolution of a field of pockmarks was poorly understood. In Burrard Inlet, the survey required a better understanding of frequency of landslides as well as depth of sediment in order to understand natural sediment depositional rates. The research expedition included deep-tow system (DTS) sub-bottom surveys and multibeam water column and bathymetric surveys in each of these areas to better understand these marine geohazards and processes. Hydrographic surveys were completed by the Canadian Hydrographic Service (CHS) at night in Pylades Channel and near Point Grey to maximize use of ship time. Weather was good, seas were calm, and good quality data were collected. The data collected will be made publicly available and have the potential to contribute to building codes and to help communities in their decision-making and understanding of risks.
Summary(Plain Language Summary, not published)
This report highlights the data collected and observations made during geoscience fieldwork onboard a Canadian Coastguard vessel August 11-18, 2021. Acoustic data were collected to better understand geohazards in the Salish Sea, including faults and landslides, as well as better understanding morphologic features, depth of units and sedimentation rates. The data collected will be made publicly available and have the potential to contribute to building codes, geoscience maps and to help communities in their decision-making and understanding of risks.

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