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TitleGeoscientific studies of Champlain Sea sediments, Bilberry Creek, Ottawa, Ontario: firm ground depth estimation through microtremor horizontal-to-vertical spectral ratios (HVSR)
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorDietiker, BORCID logo
SourceGeological Survey of Canada, Open File 8729, 2020, 14 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
RelatedNRCan photo(s) in this publication
RelatedThis publication is related to Geoscientific studies of Champlain Sea sediments, Bilberry Creek, Ottawa, Ontario: on-site preservation of cores
File formatreadme
File formatpdf; rtf; saf (ASCII)
NTS31G/05; 31G/06
AreaOttawa; Bilberry Creek; Voyageur Creek
Lat/Long WENS -75.5500 -75.4833 45.4833 45.4500
Subjectssurficial geology/geomorphology; geophysics; engineering geology; Nature and Environment; Science and Technology; marine sediments; seismic methods; seismology; seismic waves; s waves; seismic velocities; spectral ratios; amplitude spectra; boreholes; field methods; in-field instrumentation; floods; slope stability analyses; Champlain Sea Sediments; Phanerozoic; Cenozoic; Quaternary
Illustrationsphotographs; location maps; geoscientific sketch maps; plots; tables; seismic profiles; digital elevation models; spectra; time series
ProgramPublic Safety Geoscience Intraplate Earthquakes
Released2020 07 09
To support selection of prospective sediment drilling sites in Orleans (Ottawa), geophysical investigations allowed a rapid estimation of depth to firm ground for several candidate locations within Champlain Sea deposits. In the Bilberry and Voyageur Creek areas, 12 ambient seismic noise measurements were recorded. Processed data from all sites fulfilled criteria for a reliable Horizontal-To-Vertical Spectral Ratio (HVSR) curve and a clear resonance peak at the fundamental resonant frequency for soft soil. Despite the low-frequency noise from windy weather and sub-optimal instrument-ground coupling, 11 sites had peak amplitudes between 6.3 and 9.8. One site had a broad peak and a low amplitude of 3.5, suspected to correlate with a dipping firm ground surface. Fundamental resonance frequencies range from 0.81 to 1.31 Hz, which translate to firm ground depths of 80 to 43 m below surface. The deepest site is located near Voyageur Creek. Within the Bilberry Creek watershed, the deepest sites are located within upstream reaches towards the southeast.
Summary(Plain Language Summary, not published)
The Rideau Valley Conservation Authority (RVCA), the City of Ottawa and the Geological Survey of Canada (GSC) are investigating potential flood risk and slope stability hazards in the Champlain Sea muds along Bilberry Creek in Orleans, Ottawa, Ontario. The goal of this study is to find the thickest sediment sequence for further drilling, coring and geotechnical investigations. At 12 of the suggested 17 sites geophysical investigations estimated mud thicknesses of 43 to 80 m. This report describes the measurement technique, interprets the results and publishes the collected raw data and the final results.

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