FORTE, Alessandro
 |
Université du Québec à Montréal forte.alessandro@uqam.ca |
Ph. D., Université de Toronto, Canada (1989)
Chaire de recherche du Canada en modélisation de la dynamique terrestre, UQAM
Département des sciences de la Terre et de l'atmosphère, UQAM
Publications
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Soldati, G., Boschi, L., Forte, A.M. 2012. Tomography of core-mantle boundary and lowermost mantle coupled by geodynamics. Geophysical Journal International, 189 (2), 730-746.
Moucha, R., Forte, A.M., 2011. Changes in African topography driven by mantle convection, Nature Geoscience, 4(10), 707-712. pdf
Walker, A.M., Forte, A.M., Wookey, J., Nowacki, A., Kendall, J.-M., 2011. Elastic anisotropy of D′′ predicted from global models of mantle flow, Geochemistry, Geophysics, Geosystems, 12(10), Q10006. pdf
Forte, A.M., Quéré, S., Moucha, R., Simmons, N.A., Grand, S.P., Mitrovica, J.X., Rowley, D.B., 2010. Joint seismic–geodynamic-mineral physical modelling of African geodynamics: A reconciliation of deep-mantle convection with surface geophysical constraints, Earth and Planetary Science Letters, 295(3-4), 329-341. pdf
Forte, A.M., Moucha, R., Simmons, N.A., Grand, S.P., Mitrovica,J.X., 2010. Deep mantle contributions to the surface dynamics of the North American continent, Tectonophysics, 481(1-4), 3-15. pdf
Perry, H.K.C., Forte, A., 2010. Upper mantle thermochemical structure from seismic geodynamic flow models: Constraints from the Lithoprobe initiative, Canadian Journal of Earth Sciences, 47 (4), 463-484. pdf
Simmons, N.A., Forte, A.M., Boschi, L., Grand, S.P., 2010. GyPSuM: A joint tomographic model of mantle density and seismic wave speeds, Journal of Geophysical Research B: Solid Earth, 115(12), B12310. pdf
Forte, A.M., Moucha, R., Rowley, D.B., Quéré, S., Mitrovica, J.X., Simmons, N.A., Grand, S.P., 2009. Recent tectonic plate decelerations driven by mantle convection, Geophys. Res. Lett., 36, L23301, doi:10.1029/2009GL040224. pdf
Moucha, R., Forte, A.M., Rowley, D.B., Mitrovica, J.X., Simmons, N.A., Grand, S.P., 2009. Deep mantle forces and the uplift of the Colorado Plateau, Geophys. Res. Lett., 36, L19310, doi:10.1029/2009GL039778, GEOTOP Publication n°2009-0011 pdf
Simmons, N.A., Forte, A.M., Grand, S.P., 2009. Joint seismic, geodynamic and mineral physical constraints on three-dimensional mantle heterogeneity: Implications for the relative importance of thermal versus compositional heterogeneity, Geophysical Journal International, 177 (3), 1284-1304. pdf
Moucha, R., Forte, A.M., Mitrovica, J.X., Rowley, D.B., Quéré, S., Simmons, N.A., Grand, S.P., 2008. Dynamic Topography and Long-Term Sea-Level Variations: There Is No Such Thing as a Stable Continental Platform, Earth and Planetary Science Letters, 271(1-4), 101-108. GEOTOP publication n°2008-0017. http://dx.doi.org/10.1016/j.epsl.2008.03.056 pdf
Moucha, R., Forte, A.M., Rowley, D.B., Mitrovica, J.X., Simmons, N.A., Grand, S.P., 2008. Mantle convection and the recent evolution of the Colorado Plateau and the Rio Grande Rift valley, Geology, 36(6), 439-442. GEOTOP publication n°2008-0011. pdf
Forte, A.M., 2007. Constraints on seismic models from other disciplines: Implications for mantle dynamics and composition, in Volume 1 of Treatise of Geophysics, edited by B. Romanowicz and A.M. Dziewonski, 805-854. GEOTOP Publication n° 2007-0013 pdf
Forte, A.M., Mitrovica, J.X., Moucha, R., Simmons, N.A., Grand, S.P., 2007. Descent of the ancient Farallon slab drives localized mantle flow below the New Madrid seismic zone, Geophys. Res. Lett., 34, L04308, doi:10.1029/2006GL027895. GEOTOP Publication n° 2007-0014 pdf
Moucha, R., Forte, A.M., Mitrovica, J.X., Daradich, A., 2007. Lateral variations in mantle rheology: implications for convection related surface observables and inferred viscosity models, Geophys. J. Int., 169 (1), 113-135. GEOTOP Publication n° 2007-0001 pdf
Simmons, N.A., Forte, A.M., Grand, S.P., 2007. Thermochemical structure and dynamics of the African superplume, Geophys. Res. Lett., 34, L02301, doi:10.1029/2006GL028009. pdf
Goy, J. L., Hillaire-Marcel, C., Zazo, C., Ghaleb, B., Dabrio, C., Gonzalez, A., Bardaji, T., Civis J., Preda, M., Ybenes, A., Forte, A. 2006. Further evidence for a relatively high sea level during the penultimate interglacial: open-system U-series ages from La Marina (Alicante,East Spain), Geodinamica Acta, 19(6), 409–426. GEOTOP Publication n° 2006-0032 pdf
Moucha, R., Forte, A.M., Quéré, S., Mitrovica, J.X., Rowley, D.B., 2006. Implications of Mantle Convection for Present-day Rates of Global Sea Level Change, Eos Trans. AGU, 87(52), Fall Meet. Suppl., Abstract T53D-1643. pdf
Quéré, S., Forte, A.M., 2006. Influence of past and present-day plate motions on spherical models of mantle convection: implications for mantle plumes and hotspots, Geophysical Journal International, 165 (3), 1041-1057. GEOTOP Publication n° 2006-0002 pdf
Simmons, N.A., Forte, A.M., Grand, S.P., 2006. Constraining mantle flow with seismic and geodynamic data: A joint approach, Earth and Planetary Science Letters, 246 (1-2), 109-124. pdf
Mitrovica, J.X., Forte, A.M., 2004. A new inference of mantle viscosity based upon joint inversion of convection and glacial isostatic adjustment data, Earth and Planetary Science Letters, 225 (1-2), 177-189. pdf
Daradich, A., Mitrovica, J.X., Pysklywec, R.N., Willett, S.D., Forte, A.M., 2003. Mantle flow, dynamic topography, and rift-flank uplift of Arabia, Geology, 31 (10), 901-904. pdf
Gaboret, C., Forte, A.M., Montagner, J.-P., 2003. The unique dynamics of the Pacific Hemisphere mantle and its signature on seismic anisotropy, Earth Planet. Sci. Lett., 208 (3-4), 219–233. pdf
Mound, J.E., Mitrovica, J.X., Forte, A.M., 2003. The equilibrium form of a rotating Earth with an elastic shell, Geophys. J. Int., 152 (1), 237–241. pdf
Perry, H.K.C., Forte, A.M., Eaton, D.W.S., 2003. Upper-mantle thermochemical structure below North America from seismic-geodynamic flow models, Geophys. J. Int., 154 (2), 279– 299. pdf
Forte, A.M., Mitrovica, J.X., Espesset, A., 2002. Geodynamic and seismic constraints on the thermochemical structure and dynamics of convection in the deep mantle, Philos. Trans. R. Soc. London, 360 (1800), 2521–2543. pdf
Mitrovica, J.X., Forte, A.M., 2002. On the radial profile of mantle viscosity, in Glacial Isostatic Adjustment and the Earth System: Sea-Level, Crustal Deformation, Gravity and Rotation, Geophys. Monogr. Ser. 29, edited by J.X. Mitrovica and L.L.A. Vermeersen, AGU, Washington, D.C.
Perry, H.K.C., Eaton, D.W.S., Forte, A.M., 2002. LITH5.0: A revised crustal model for Canada based on LITHOPROBE results, Geophys. J. Int., 150 (1), 285-294. pdf
Forte, A.M., Mitrovica, J.X., 2001. Deep-mantle high-viscosity flow and thermochemical structure inferred from seismic and geodynamic data, Nature, 410 (6832), 1049–1056. pdf
Forte, A.M., Perry, H.K.C., 2000. Geodynamic Evidence for a Chemically Depleted Continental Tectosphere, Science, 290 (5498), 1940–1944. pdf
Forte, A.M., 2000. Seismic-geodynamic constraints on mantle flow: Implications for layered convection, mantle viscosity, and seismic anisotropy in the deep mantle, in Earth’s Deep Interior: Mineral Physics From the Atomic to the Global Scale, Geophys. Monogr. Ser. 117, edited by S.–I. Karato et al., AGU, Washington, DC, pp. 3–36.
Mitrovica, J.X., Forte, A.M., Simons, M., 2000. A Reappraisal of postglacial decay times from Richmond Gulf and James Bay, Canada, Geophys. J. Int., 142 (3), 783–800. pdf
Forte, A.M., Peltier, R.W., 1994. The Kinematics and dynamics of poloidal-toroidal coupling in mantle flow; The importance of surface plates and lateral viscosity variations, in Advances in Geophysics, edited by R. Dmowska and B. Saltzman, volume 36, Academic Press, 122p., pdf
Thèmes de recherche
Mots-clés: Plate tectonics, physics of earth'Interior, computational modeling
One of the major objectives in modern day Earth Physics is understanding the planetary-scale transport of mass and heat in Earth's deep interior. This thermal convection process is responsible for a remarkably wide variety of dynamical interactions between the Earth's liquid core and solid overlying mantle, between different layers within the mantle, between the mantle and external crust, and even between the Earth and other planets in the Solar System. The main objective of my research activities is the elucidation of the spatial and temporal variation of the slow creep or flow of material in Earth's solid interior over geological time. This research also focuses on understanding and modeling the consequences of this mantle flow on a wide variety of processes occurring on the Earth's surface, such as: the tectonic plate motions and the associated ‘drift’ of continents; large-scale variations in surface topography and associated sea level changes which are recorded in deep sedimentary basins in continental interiors; dynamic stresses in Earth's crust; perturbations in Earth's orbital motions and resulting variations in paleoclimate which are recorded in sedimentary cycles and rhythms.
This broad program of research involves a quantitative, multi-disciplinary, ‘Earth systems’ approach to global geodynamics, which benefits from collaboration with colleagues working in a wide spectrum of disciplines (e.g., seismology, fluid mechanics, solid mechanics, classical mechanics, mineral physics, paleomagnetism, geochemistry, numerical methods, computational modeling).
The dominant large scale structure in Earth's lower mantle
The three-dimensional image of deep Earth structure shown here was derived by Forte, Woodward, & Dziewonski [J. Geophys. Res., vol. 99, pp. 21,857-21,877, 1994]. The structures shown in this image have been mathematically smoothed and are characterized by horizontal length scales greater than about 4500 kilometers. Laboratory experiments on rocks show that the waves generated by earthquakes will travel faster in rocks which are colder and will travel slower in rocks that are hotter. The blue colours in this figure show the regions of the mantle in which earthquake waves are sped up, presumably because of the colder temperatures in these regions. The red colours show the regions of the mantle where earthquake waves are slowed down, suggesting that these huge mushroom-shaped features or `mega-plumes' have hotter temperatures. The accumulated cold material under the central part of the US is due to the descent of the ancient Farallon slab. It is proposed that the forces generated by this sinking slab are responsible for seismic activity in the Mississippi Valley region of the central US (Forte et al., GRL, 2007). (Note: the large grey coloured sphere in the centre is the Earth's metallic core.)
Étudiants
Auerbach, Paul: M.Sc. sc. de la Terre, UQAM
Sujet de recherche: Modélisation géodynamique
Glisovic, Petar: Ph.D. Sciences de la Terre et de l'atmosphère, UQAM
Sujet de recherche: Evolution temporelle de la convection thermique dans le manteau terrestre: Une approche numérique
Moucha, Robert: Stagiaire post-doctoral, UQAM
Sujet de recherche: Modélisation numérique haute-performance de la convection mantellique sur ordinateurs parallèles; modélisation géodynamique globale
Robert, Xavier: Stagiaire post-doctoral, UQAM
Sujet de recherche: Quantification de l'évolution de la topograhie dynamique à partir de données thermochronologiques, d'évolution de la topographie et de modélsation numérique
Zaray Calderon Goyeneche, Erika: M.Sc. en sciences de la Terre, UQAM
Sujet de recherche: Flexure lithosphérique du continent Sud américain induit par l'accumulation de sédiments océaniques et l"érosion intracontinentale: conséquences pour l'évolution temporelle de la topographie sud-américaine au cours des derniers 30 millions d'années.
Dubé, Jean-Michel: M.Sc. en sciences de la Terre, UQAM
Sujet de recherche: Géodynamique africaine
