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TitleCrustal structure in the Gulf of St. Lawrence region, eastern Canada: preliminary results from receiver function analysis
LicencePlease note the adoption of the Open Government Licence - Canada supersedes any previous licences.
AuthorKao, HORCID logo; Shan, S -J; Cassidy, J FORCID logo; Dehler, S AORCID logo
SourceGeological Survey of Canada, Open File 7456, 2014, 48 pages, Open Access logo Open Access
PublisherNatural Resources Canada
Documentopen file
Mediaon-line; digital
File formatpdf
ProvinceEastern offshore region
AreaGulf of St. Lawrence
Lat/Long WENS -68.0000 -58.0000 50.5000 43.5000
Subjectstectonics; marine geology; structural geology; crustal structure; crustal studies; tectonic environments; tectonic interpretations; tectonic evolution; oceanic crust; structural interpretations; structural analyses; remote sensing; LITHOPROBE; Anticosti Basin; Magdalen Basin; Orpheus Basin; Sydney Basin
Illustrationslocation maps; tables; photographs; profiles
ProgramPublic Safety Geoscience Eastern Canada Geohazards Assessment Project
Released2014 03 13
Summary(Plain Language Summary, not published)
In this study, seismic waveform data recorded at stations in the Gulf of St. Lawrence area are analyzed to constrain the regional seismic velocity structure. The horizontal component seismograms are compared to the vertical component to delineate the depths and the amounts of contrast of velocity discontinuities at depths. Along the N-S profile, our preliminary results show that the crustal thickness varies significantly from 28 km in the middle to 44 and 40 km in the north and south, respectively. In contrast, on the E-W profile, the thickest crust (46 km) is found beneath the middle station NATG. The crustal thickness gradually decreases to the east (31 km, DRLN) and slightly to the west (44 km, ICQ). Given the relatively noisy site conditions that significantly limit the quality of earthquake waveform data, it is suggested that other technique, such as the ambient seismic noise analysis, should be conducted in the future to provide further constraints.

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