DARBYSHIRE Fiona
 |
Université du Québec à Montréal darbyshire.fiona_ann@uqam.ca |
Ph. D. Cambridge, Royaume-Uni, 2000
Département des sciences de la Terre et de l'atmosphère, UQAM
Publications
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Bastow, I.D., Thompson, D., Wookey, J., Kendall, J.-M., Helffrich, G., Snyder, D., Eaton, D. & Darbyshire, F.A.,2011. Precambrian plate tectonics: Seismic evidence from Hudson Bay, Canada, Geology, 39, 91-94. pdf
Stein, S., van der Lee, S., Jurdy, D., Stein, C., Wiens, D., Wysession, M., Revenaugh, J., Frederiksen, A., Darbyshire, F., Bollman, T., Lodewyk, J., Wollin, E., Merino, M. & Tekverk, K., 2011. Learning from failure: the SPREE Mid-Continent Rift Experiment, GSA Today, 21(9), 5-7. pdf
Darbyshire, F.A., Eaton, D.W., 2010. The lithospheric root beneath Hudson Bay, Canada from Rayleigh-wave dispersion: No clear seismological distinction between Archean and Proterozoic mantle, Lithos, 120(1-2), 144-159. 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
Belmouden, Yamine: PhD. sciences de la Terre et de l'atmosphère
Sujet de recherche: Structure sismique du rift mi-continental, nord-Amérique
Wang, Bingzhu: Stagiaire post-doctoral
Liens
IRIS Consortium
POLARIS Consortium www.polarisnet.ca
POLARIS Ontario website www.polonet.ca
CHASME project
Canadian National Seismograph Network
