The Canadian Rockies and Alberta Network (CRANE): New Constraints on the Rockies and Western Canada Sedimentary Basin
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Résumé
Other| July 01, 2011 The Canadian Rockies and Alberta Network (CRANE): New Constraints on the Rockies and Western Canada Sedimentary Basin Yu Jeffrey Gu; Yu Jeffrey Gu Department of Physics University of Alberta Edmonton, Alberta T6G2G7 Canada ygu@ualberta.ca (Y. J. G.) Search for other works by this author on: GSW Google Scholar Ahmet Okeler; Ahmet Okeler Department of Physics University of Alberta Edmonton, Alberta T6G2G7 Canada ygu@ualberta.ca (Y. J. G.) Search for other works by this author on: GSW Google Scholar Luyi Shen; Luyi Shen Department of Physics University of Alberta Edmonton, Alberta T6G2G7 Canada ygu@ualberta.ca (Y. J. G.) Search for other works by this author on: GSW Google Scholar Sean Contenti Sean Contenti Department of Physics University of Alberta Edmonton, Alberta T6G2G7 Canada ygu@ualberta.ca (Y. J. G.) Search for other works by this author on: GSW Google Scholar Seismological Research Letters (2011) 82 (4): 575–588. https://doi.org/10.1785/gssrl.82.4.575 Article history first online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Yu Jeffrey Gu, Ahmet Okeler, Luyi Shen, Sean Contenti; The Canadian Rockies and Alberta Network (CRANE): New Constraints on the Rockies and Western Canada Sedimentary Basin. Seismological Research Letters 2011;; 82 (4): 575–588. doi: https://doi.org/10.1785/gssrl.82.4.575 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietySeismological Research Letters Search Advanced Search Abstract The Canadian Rockies and the neighboring Alberta Basin mark the transition from the old North American continental lithosphere (east) to young accreted "terranes" (west). Geologic, seismic, and magnetic data in this region have suggested complex crustal domains, conductive anomalies, and major seismic velocity gradients in the mantle. However, the nature of the boundaries between the basement domains and their vertical extents remains controversial due to the lack of exposed geology and limited seismic and electromagnetic receivers. Since 2006, the seismic data coverage and depth sensitivity have received a major boost from the establishment of the Canadian Rockies and Alberta Network (nicknamed CRANE), the first semi-permanent broadband seismic array in Alberta. The availability of the array data provides vital constraints on the regional micro-earthquakes and crust/mantle seismic structures. Among the broad range of ongoing efforts, this study highlights promising results from the analyses of P-to-S wave receiver functions, shear wave splitting amplitudes/directions, and ambient seismic noise. Our preliminary receiver-function stacks show that the base of the crust gradually shallows from approximately 60 km beneath the Rockies near the Canadian-U.S. border to 37–40 km beneath central Alberta; the latter range is consistent with earlier findings from active-source experiments. Converted waves from "littered" crust and/or lithosphere have also been detected at a number of stations in the depth range of 80–130 km. Complexities in the lithosphere are further evidenced by our regional shear wave splitting measurements. We infer a strong east-west change of mantle flow pattern, consistent with present-day plate motion. The spatial distribution of the SKS fast orientations highlights the contrasting crust/mantle structures and histories between the Rockies and adjacent domains. Dynamic effects associated with a migrating continental root east of the province may be important. Finally, our preliminary inversions using ambient seismic noise indicate more than 0.8 km/s in peak-to-peak group velocity variations throughout the crust. The upper crust beneath the Alberta Basin is dominated by low Rayleigh-wave group velocities. A lower-than-expected correlation between seismic velocities and tectonic domain boundaries suggests significant tectonic overprinting in the southern Western Canada Sedimentary Basin. Overall, the broadband seismic data from CRANE could play a key role in uncovering the mysteries of the crust and mantle beneath the transition region between cratons and terranes. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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|---|---|---|
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| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
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| Études des sciences et des technologies | 0,002 | 0,001 |
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Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
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