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TitleGeophysical and geotechnical characteristics of Champlain Sea sediments in the Ottawa Valley, Canada
AuthorCrow, H; Oldenborger, G; Pugin, A; Hunter, J; Dietiker, B
SourceProceedings of the 23rd European Meeting of Environmental and Engineering Geophysics (EAGE) - Near Surface Geophysics meeting; 2017, 5 pages
Year2017
Alt SeriesNatural Resources Canada, Contribution Series 20170018
PublisherEAGE
Meeting23rd European Meeting of Environmental and Engineering Geophysics (EAGE) - Near Surface Geophysics meeting; Malmo; SE; September 3-7, 2017
Documentbook
Lang.English
Mediapaper; on-line; digital
File formatpdf
ProvinceQuebec; Ontario
NTS31G/05
AreaSt. Lawrence valley; Ottawa-Gatineau
Lat/Long WENS -75.7500 -75.3333 45.5500 45.1667
Subjectsglaciomarine deposits; earthquake risk; earthquake studies; geophysical surveys; electrical resistivity; electrical surveys; boreholes; Leda clays; earthquake shaking; geotechnical properties
Illustrationslocation maps; plots; cross-sections; borehole logs
ProgramAssessing Earthquake Geohazards, Public Safety Geoscience
LinksOnline - En ligne
AbstractThe soft Champlain Sea sediments of the Ottawa Valley, Canada are susceptible to earthquake-triggered ground failure and contribute to significant amplification of earthquake shaking. We investigate the geophysical and geotechnical properties of Champlain Sea sediments and the underlying shape of the bedrock basin. The objective of the multidisciplinary approach is to characterize the geophysical and geotechnical signatures of high sensitivity clay and silt, and to improve understanding of how these sediments respond to earthquake
shaking. Geophysical techniques employed in this study include microtremor recordings, high-resolution seismic profiling, electrical resistivity imaging, and downhole geophysical logging. Geophysical and geotechnical data suggest a bedrock basin up to 98 m deep with a soft sediment fill that exhibits localized evidence of leaching and high sensitivity. Results are consistent with the presence of retrogressive landslide scars in the Breckenridge study area.
Summary(Plain Language Summary, not published)
The soft Champlain Sea sediments of the Ottawa Valley, Canada, are susceptible to earthquake-triggered ground failure and contribute to significant amplification of earthquake shaking. We investigate the geophysical and geotechnical properties of Champlain Sea sediments, and the shape of the bedrock basin underlying them. Geophysical techniques employed in this study include microtremor recordings, high-resolution seismic profiling, electrical resistivity imaging, and downhole geophysical logging. Results suggest a bedrock basin depth of up to 98 m with soft sediment fill that exhibits localized evidence of leaching and high sensitivity that may contribute to failure in the event of ground shaking.
GEOSCAN ID300536