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TitleAtlas of Sonobuoy velocity analyses in Canada Basin
DownloadDownloads
AuthorChian, D; Lebedeva-Ivanova, N
SourceGeological Survey of Canada, Open File 7661, 2015, 55 pages, https://doi.org/10.4095/295857 (Open Access)
Year2015
PublisherNatural Resources Canada
Documentopen file
Lang.English
Mediaon-line; digital
File formatreadme
File formatpdf; xls; rtf
ProvinceNorthern offshore region
AreaArctic Ocean; Alpha Ridge; Canada Basin; Northwind Ridge; Nautilus Spur
Lat/Long WENS140.0000 -168.0000 85.0000 72.0000
Subjectsstratigraphy; marine geology; geophysics; crustal studies; seismic interpretations; seismic surveys; seismic surveys, marine; seismic profiles, marine; geophysical surveys; reflection studies; seismic reflection surveys; sedimentary environment; sedimentary structures; sedimentary environments; velocity surveys; seismic velocities
Illustrationsseismic reflection profiles; plots; location maps; tables
ProgramPreparation of a submission for an extended continental shelf in the Atlantic and Arctic Oceans under UNCLOS, Delineating Canada's Continental Shelf Under UNCLOS
Released2015 04 22
AbstractCanada Basin of the Arctic Ocean is located in one of the most remote, ice-covered regions on Earth. This Atlas presents the data and velocity models for 144 out of 174 sonobuoys launched throughout and north of the Canada Basin between 2007 and 2011. The data, which are coincident with multichannel seismic reflection profiles, were acquired to map p-wave velocities and thicknesses of the sedimentary column. The refraction and wide-angle reflection data provide the basis for transformation of seismic reflection travel time data to the depth domain. Two independent approaches were utilized to obtain velocity models from the sonobuoy data: forward modeling (FM) of refracted arrivals and semblance analysis (SA) of wide-angle reflections. Sonobuoys with both FM and SA number 99. Agreement between the data sets is excellent. The maximum difference between the methods is about 10% and more than half of the measurements agree to within 5%. This atlas is a first release of these data with preliminary analyses and interpretations.
Summary(Plain Language Summary, not published)
Canada Basin of the Arctic Ocean is one of the most remote, ice-covered regions on Earth. Between 2007 and 2011, more than 170 sonobuoys were launched throughout and north of the Canada Basin in concert with a seismic reflection program, to map velocities and thicknesses of the sedimentary column. Two independent approaches were utilized to obtain velocity models from the sonobuoy data: forward modeling (FM) of refracted arrivals and semblance analysis (SA) of wide-angle reflections. Both techniques provided remarkably similar results providing confidence in the analysis. This atlas is a first release of these data and their preliminary analysis with interpretations.
GEOSCAN ID295857