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About > People > Grad > P.Audet
Pascal Audet
PhD-GEOP
Seismology / Plate Tectonics
Office: EOS-East 211 Phone:
E-mail:
Personal Website: http://seismo.berkeley.edu/~paudet
Profile
Education
Ph.D Geophysics, University of British Columbia, 2005-2008
M.Sc Earth Sciences, Université du Québec à Montréal, 2002-2004
B.Sc Physics, Université de Montréal, 1999-2002
Awards
Miller Research Fellowship, 2008 (UC Berkeley)
Paetzold Graduate Fellowship, 2007 (UBC)
FQRNT Postgraduate Scholarship, 2007
Thomas and Marguerite MacKay Memorial Scholarships, 2005, 2006 (UBC)
NSERC Postgraduate Scholarship - D, 2005
AGU Outstanding Student Paper Award in Tectonophysics, 2004
NSERC Postgraduate Scholarship - M, 2002
Hubert-Biermans Foundation Scholarship, 2001 (UM)
NSERC Undergraduate Research Awards, 2000, 2001
Publications
Submitted, in press
Audet, P., M. G. Bostock, D. C. Boyarko, M. R. Brudzinski, and R. M. Allen, 2008. Slab morphology in the Cascadia forearc and its relation to episodic tremor and slip, submitted, Journal of Geophysical Research.
Audet, P., M. G. Bostock, N. I. Christensen, and S. M. Peacock, 2008. Seismic evidence for overpressured subducted oceanic crust and sealing of the megathrust, accepted, Nature.
In print
Audet, P., M. G. Bostock, J.-P. Mercier, and J. F. Cassidy, 2008. Morphology of the Explorer/Juan de Fuca slab edge in northern Cascadia: Imaging plate capture at a ridge-trench-transform triple junction, Geology, 36, 895-898, doi:10.1130/G25356A.
Mercier, J.-P., M. G. Bostock, P. Audet, J. B. Gaherty, E. J. Garnero, and J. Revenaugh, 2008. The teleseismic signature of fossil subduction: Northwestern Canada, Journal of Geophysical Research, 113, B04308, doi:10.1029/2007JB005127.
Audet, P., M. G. Bostock, and J.-P. Mercier, 2007. Teleseismic waveform modelling with a one-way wave equation, Geophysical Journal International, 171, 1212-1225, doi:10.1111/j.1365-246X.2007.03586.x.
Audet, P., A. M. Jellinek, and H. Uno, 2007. Mechanical controls on the deformation of continents at convergent margins, Earth and Planetary Science Letters, 264, 151-166, doi:10.1016/j.epsl.2007.09.024.
Audet, P., and J.-C. Mareschal, 2007. Wavelet analysis of the coherence between Bouguer gravity and topography: Application to the elastic thickness anisotropy in the Canadian Shield, Geophysical Journal International, 168, 287-298, doi:10.1111/j.1365-246X.2006.03231.x.
Audet, P., and J.-C. Mareschal, 2004. Anisotropy of the flexural response of the lithosphere in the Canadian Shield, Geophysical Research Letters, 31, L20601, doi:10.1029/2004GL021080.
Audet, P., and J.-C. Mareschal, 2004. Variations in elastic thickness in the Canadian Shield, Earth and Planetary Science Letters, 226, 17-31, doi:10.1016/j.epsl.2004.07.035.
Research Interests
My research involves the development of geophysical techniques to study tectonic processes in the Earth. In particular I am interested in the structure and deformation of continental lithosphere at a regional scale using the tools of potential fields and seismology. My main areas of interest are the Canadian Shield, western Cordillera, and the Cascadia subduction zone.
Seismology
I study the seismic attributes of the subducting oceanic Juan de Fuca plate beneath the forearc crust in the Cascadia subduction zone to map the morphology of the descending slab and to place constraints on the structural controls associated with megathrust (M>9) earhquakes and recently discovered episodic tremor and slip events. We find evidence for elevated pore-fluid pressure (>hydrostatic pressure) in the subducted oceanic crust, a result with important implications for the permeability of the plate interface and the transport of water in subduction zones. I also use seismic data to locate the termination of subduction and associated slab edge tectonism at the northern end of Cascadia beneath Vancouver Island.
I use a wide-angle elastic one-way wave equation to model waveform distortions due to 3D propagation and scattering of teleseismic body-waves travelling through realistic 2D heterogeneous, anisotropic Earth models. The algorithm is used to model data from an array of broadband seismograph stations deployed in northwestern Canada as part of the CANOE experiment. We interpret receiver function images that show a dipping layer of anisotropic material at a Paleo-Proterozoic suture zone to be the fossil signature of a subducted slab.
Plate rigidity
I study the variations and the anisotropy of the effective elastic thickness of the continental lithosphere using the spectral coherence between Bouguer gravity and topography. I use different spectral methods (maximum entropy, multitaper, wavelet transform) to improve upon the spatio-spectral, and azimuthal resolution of the coherence. I relate the variations in elastic thickness and mechanical anisotropy to the rheology and to geophysical indicators of deformation to build a conceptual model of lithospheric deformation of the Canadian landmass.
Copyright ©2008
Department of Earth and Ocean Sciences, University of British Columbia.
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