PROJETS EN COURS
Le Geotop prend part aux programmes suivants:
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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Villemaire, M., Darbyshire, F.A., Bastow, I.D. 2012. P-wave tomography of eastern North America: Evidence for mantle evolution from Archean to Phanerozoic, and modification during subsequent hot spot tectonism, Journal of Geophysical Research : Solid Earth, 117 (12).
Frederiksen, A.W., Bollmann, T., Darbyshire, F., van der Lee, S., 2012. Modification of continental lithosphere by tectonic processes: a tomographic image of central North America. Journal of Geophysical Research, in revision
Villemaire, M., Darbyshire, F.A., Bastow, I.D., 2012. Evolution of the mantle from Archean to Phanerozoic and its modification during subsequent hotspot tectonism : seismic evidence from eastern North America. Journal of Geophysical Research, 117, doi:10.1029/2012JB009639
Pawlak, A., Eaton, D.W., Darbyshire, F., Lebedev, S., Bastow, I.D. 2012. Crustal anisotropy beneath Hudson Bay from ambient noise tomography: Evidence for post-orogenic lower-crustal flow? Journal of Geophysical Research B: Solid Earth, 117, doi:10.1029/2011JB009066
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
200 km depth slice through the P-wave relative arrival-time tomography model of Villemaire et al (2012), showing upper-mantle structure of eastern Canada and the northeast US. GF: Grenville Front, AF: Appalachian Front. White triangles are seismograph stations, brown diamonds are kimberlites and red circles show other magmatic centres.
Of particular interest: a high-velocity body in the north that may be linked to possible fossil Archean subduction remnants, a patchy low-velocity corridor in the south, attributed to modification of the North American lithosphere by the passage of the Great Meteor hotspot.
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.
Over the past 6 years, I have installed 15 new broadband seismographs across central and southern Québec, Nunavik and Labrador, which transmit data in real time to the national data archives at the Geological Survey of Canada. In addition, I am actively involved with aspects of the EarthScope programme; the Transportable Array deployment in southeastern Canada plus two FlexArray projects, SPREE (Superior Province Rifting EarthScope Experiment) and QM-III (Québec-Maine Across Three Sutures) which target specific regions of particular tectonic interest. I have also been working on upper-mantle structure beneath Hudson Bay over several years, through collaboration with the HuBLE (Hudson Bay Lithospheric Experiment) project.
The techniques employed in my research use several parts of the teleseismic waveforms recorded at the seismograph stations: P-wave receiver functions for crustal structure, P-wave arrival times for mantle tomography, SKS phases for splitting analysis of anisotropy, and surface-wave tomography for upper mantle structure and stratification of seismic anisotropy.
Étudiants
Belmouden, Yamine: PhD. sciences de la Terre et de l'atmosphère
Sujet de recherche: Structure sismique du rift mi-continental, Amérique du Nord
Dubé, Jean-Michel : M.Sc. sciences de la Terre
Sujet de recherche: Anisotropy of the Canadian High Arctic
Wang, Bingzhu: Stagiaire post-doctoral
Liens
IRIS Consortium (http://www.iris.edu/hq/)
POLARIS Consortium (http://polarisnet.ca/)
EarthScope programme (http://earthscope.org/)
USArray (http://www.usarray.org/)
Canadian National Seismograph Network (http://www.earthquakescanada.nrcan.gc.ca/index-eng.php)
