Publications

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Darbyshire, F.A., Eaton, D.W., In Press.  The lithospheric root beneath Hudson Bay, Canada from Rayleigh-wave dispersion: No clear seismological distinction between Archean and Proterozoic mantle, Lithos. pdf

Eaton, D.W., Darbyshire, F., 2010. Lithospheric architecture and tectonic evolution of the Hudson Bay region, Tectonophysics, 480(1-4), 1-22. pdf

Darbyshire, F. A.,  Lebedev, S., 2009. Rayleigh wave phase-velocity heterogeneity and multi-layered azimuthal anisotropy of the Superior Craton, Ontario, Geophysical Journal International, 176 (1), 215-234. GEOTOP publication n° 2008-0028. pdf 

Eaton, D.W., Darbyshire, F., Evans, R., Grutter, H., Jones, A., Yuan, X., 2009. The elusive lithosphere-asthenosphere boundary beneath cratons, Lithos special issue, 109 (1-2), 1-22. pdf

Darbyshire, F.A., Eaton, D.W., Frederiksen, A.W., Ertolahti, L., 2007. New insights into the lithosphere beneath the Superior Province from Rayleigh wave dispersion and receiver function analysis, Geophys. J. Int., 169(3), 1043-1068, doi:10.1111/j.1365-246X.2006.03259.x. pdf

Frederiksen, A.W., Miong, S.-K., Darbyshire, F., Eaton, D., Rondenay, S., Sol, S., 2007. Variations in Lithospheric Thickness Across the Superior Province, Ontario, Canada: Evidence from Tomography and Shear-Wave Splitting, J. Geophys. Res., 112, doi:10.1029/2006JB004861. pdf

Darbyshire, F.A., Asudeh, I., 2006. Generic instrument responses for the POLARIS and FedNor seismograph network in Canada, Geol. Surv. Canada, Open File 5185, 23pp.

Darbyshire, F.A., 2005. Upper mantle structure of Arctic Canada from Rayleigh wave dispersion, Tectonophysics, 405, 1-23. pdf

Darbyshire, F.A., Larsen, T.B., Mosegaard, K., Dahl-Jensen, T., Gudmundsson, Ó., Bach, T., Gregersen, S., Pedersen, H.A., Hanka, W., 2004. A first detailed look at the Greenland lithosphere and upper mantle, using Rayleigh wave tomography, Geophys. J. Int., 158, 267-286. pdf

Darbyshire, F.A., 2003. Crustal structure across the Canadian High Arctic region from teleseismic receiver function analysis, Geophys. J. Int., 152, 372-391. pdf

Snyder, D., Asudeh, I., Darbyshire, F., Drysdale, J., 2002. Field-based feasibility study of teleseismic surveys at high northern latitudes, Northwest Territories and Nunavut, Geol. Surv. Canada, Current Research C03, 10 pp. 

Weir, N.R.W., White, R.S., Brandsdóttir, B., Einarsson, P., Shimamura, H., Shiobara, H., RISE fieldwork team, 2001. Crustal structure of the northern Reykjanes Ridge and Reykjanes Peninsula, southwest Iceland, J. Geophys. Res.,106, 6347-6368.  pdf

Darbyshire, F.A., White, R.S., Priestley, K.F., 2000. Structure of the crust and uppermost mantle of Iceland from a combined seismic and gravity study, Earth Planet. Sci. Lett.,181, 409-428. pdf

Darbyshire, F.A., Priestley, K.F., White, R.S., Stefánsson, R., Jakobsdóttir, S., Gudmundsson, G., 2000. Crustal structure of central and northern Iceland from analysis of teleseismic receiver functions, Geophys. J. Int., 143, 163-184. pdf

Thèmes de recherche

Mots- clés: seismology, tectonophysics, subcontinental lithosphere, broadband seismographs, teleseismic data, surface waves, anisotropy, Canadian Shield

Surface wave phase velocity maps for northern and eastern Ontario and southwesternmost Quebec. Green lines denote major tectonic boundaries. Maps at four different wave periods are shown, representing samples of the upper lithospheric mantle (50 seconds) down to the lower lithosphere / upper asthenosphere (150 seconds). Colours represent deviations in isotropic phase velocity (blue: faster than the regional average for the given period; red: slower than average) and the black bars represent direction and relative amplitude of anisotropy.

My primary interest is the structure of the crust and upper mantle beneath continental cratons and their margins. I use waveform data from teleseismic earthquakes, recorded at regional broadband seismograph arrays, to investigate variations in wavespeed in the subcontinental lithosphere in order to understand the history of formation, current dynamics, and interactions with mantle processes.
In the past 4 years, the main focus of my research has been the use of surface waves to model shear wave velocity structure beneath Arctic Canada, southern Greenland and northern Ontario, using data from both permanent broadband seismograph arrays such as the Canadian National Seismograph Network and from new temporary deployments (the CHASME - Canadian High Arctic Seismic Monitoring Experiment), GLATIS [Greenland Lithosphere Analysed Teleseismically on the Ice Sheet] and POLARIS project [Portable Observatories for Lithospheric Analysis and Research Investigating Seismicity]. Currently I am investigating the internal variations in lithospheric structure of the Superior craton in northern Ontario, using a recently-developed surface wave tomography method (in collaboration with Sergei Lebedev, University of Utrecht, the Netherlands) to image patterns of both velocity heterogeneity and anisotropy beneath the region.
Over the next few years, I intend to expand the investigations of crust and upper mantle structure into regions that have previously been poorly-resolved due to a lack of seismograph station coverage. Such regions include Hudson Bay, for which the HuBLE (Hudson Bay Lithospheric Experiment) multinational research project has recently been initiated, and the Superior craton and Grenville Province beneath Québec.

Étudiants

Joyal, Guillaume: M.Sc. sc. de la Terre
Sujet: Structure lithosphérique du Groenland

Villemaire, Mélanie: M.Sc. sc. de la Terre
Sujet: Formation d'une image séismique tridimentionnelle de la ceinture de roches vertes de l'Abitibi et de la Province de Grenville

Liens

IRIS Consortium
POLARIS Consortium  www.polarisnet.ca
POLARIS Ontario website www.polonet.ca
CHASME project
Canadian National Seismograph Network