Address :

Laboratoire de Géologie UMR CNRS 8538

Ecole Normale Supérieure

24, rue Lhomond

75231 Paris Cedex05, France

Phone: (33) 1-44–32–22–73

Email: leroyy@geologie.ens.fr


Current Position:

”Directeur de Recherche”, Centre National de la Recherche Scientifique, Laboratoire de

Géologie, Ecole Normale Supérieure, France (2004-).

Professor (part time) at the Ecole Centrale Paris, France, in charge of the teaching ”Energies

Fossiles” to the third year students (2010-).

Positions Held:

Faculty, Mechanics Department at Ecole Polytechnique, France (1997-2010, on leave 2003-


Director of Studies, Département TAO (Earth, Atmosphere and Ocean), Ecole Normale

Supérieure, (2006-2008).

Deputy director, Département TAO, Ecole Normale Supérieure, (2006-2008).

Clark B. Millikan Visiting Professor of Aeronautics, California Institute of Technology,

Pasadena, California, USA (2003-04).

Directeur de Recherche, Centre National de la Recherche Scientifique, Laboratoire de Méca-

nique des Solides, UMR 7649, Ecole Polytechnique, France (2001-2003).

Chargé de Recherche, Centre National de la Recherche Scientifique, L.M.S. Ecole Polytech-

nique, France (1995-2001).

Adjunct Professor, Aerospace Engineering Department, The University of Michigan, Ann

Arbor. (2001).

Research Engineer, Shell Research (Koninklijke/Shell Exploratie en Produktie Laborato-

rium, Holland) (1988-1994).

Visiting Professor, the University of Michigan, Ann Arbor, (Summers 1995-97).

Visiting Professor, the University of Metz, France, (Summers 1991-93).


Habilitation Université de Metz, France, 1994

Ph.D. Solid Mechanics, Brown University, Providence (R.I.), U.S.A. 1989

M.Sc. Applied Mathematics, Brown University, Providence (R.I.), U.S.A. 1988

M.Sc.A. Civil Engineering, Université de Sherbrooke (Québec), Canada 1984

D.I.C. Civil Engineering, Imperial College of London, England 1981

Ing. E.H.E.I. Ecole des Hautes Etudes Industrielles (Lille), France 1981

Research interests:

“Mechanics for the Solid Earth”

The mechanics of fluid-saturated rocks in accretionary wedges and the stability conditions

by application of limit analysis. Determination of the over-pressures conditions for the

activation of splay-faults.

Folding in the presence of ramps in fold-and-thrust belts (FTB): link between the geom-

etry of the fold and the rheology of the stratified rocks. Application of limit analysis to

produce mechanically balanced cross sections to complement the now classical geometrical

constructions of folds. Application of limit analysis to the formation and development of

triangular zones at the front of FTB.

Compaction in sedimentary basins by pressure solution. Development of macro-scale con-

stitutive relations based on a description of the deformation mechanisms (dissolution/preci-

pitation) at the grain scale. Potential genereralization to other stress-enhanced fluid-rock

interactions relevant to geochemistry and to environmental problems.

3D fracture development in frictional, cohesive and creeping rocks: application to polyg-

onal faults in carbonates and in the context of salt tectonics.

Others: Stability and bifurcation of elasto-plastic solids and structures; The internal

structure of thermo-mechanical shear zones; quantitative relations between the fracture

densities and the fold geometry and local stress history; Shear-enhanced compaction of

highly porous reservoir rocks, compaction bands.

Teaching Experience:

Ecole Normale Suprieure, Paris, course on continuum mechanics for solids and fluids

(L3), 2007-

Chinese Academy of Sciences, Beijing, Fluid-assisted rock deformation and tectonics,


ICES, University of Texas at Austin, Mechanics of porous media, March-April 2009.

California Institute of Technology, Computational Solid Mechanics, Ae214, 2003-2004.

Ecole Polytechnique (undergraduates): Continuum mechanics, The Solid Earth, Hetero-

geneous solids, (1997-).

CISM Udine, Italy: Deformation in the Earth’s continental crust: theory, experiements

and modeling, continuum mechanics, finite-element, pressure solution, folding (2002).

The University of Michigan: Introduction to the Finite-Element Method AE510 (Fall


Ecole Centrale and Ecole Polytechnique (graduate program - DEA): Continuum Me-

chanics, Poro-elasticity, Plasticity theory (1995-2002).

The University of Metz (graduate program - DEA): The finite-element method (90-91).

Université de Sherbrooke, Brown University: Teaching assistant for undergraduate

courses in statics, dynamics, strength of material and fluid mechanics (1982-1998).

Field Work:

Corbires, France, 2010-

Taiwan, November 2009.

Majella anticline, Italy, October 2008.

Neuquen basin, Argentina, 2007.

Fractured anticlines in the Tata-Akka region (Anti-Atlas, South Morocco, 1996 and 1998):

field example to illustrate how inherited fractures are activated during folding.

Fault-bent folds in the region of Goulmima (High Atlas front, Morocco, 2002): search for

deformation markers in material having passed a fixed hinge.

Fracture distribution over Split Mountain and other forced folds in the region of Vernal

(Utah, 2002): statistical distribution of fractures in relation to the state of deformation.

Observation of the distribution of granulite and eclogite in a shear zone, Bergen’s arc,

Norway (2002): analysis of the strain localization which follows the granulite to eclogite


Professional Activities:

Member of the European Union of Geosciences, of the American Geophysical Union

Member of the A.S.M.E. Technical Committee on “Instabilities in Solids and Structures


Consulting for Shell-UK (1996) : compaction and subsidence in the North Sea.

Coordinator (with F.K. Lehner) of the course Deformation in the Earth’s continental crust:

theory, experiments and modeling, CISM Udine, Italy, (June 2002).

Graduate students and Post-doctoral staff supervision:

C. Liu, Doctoral student (2010-), in collaboration with Gucas (Beijing, China) and with

the supervision of Prof. Y.L. Shi.

A. Pons, Doctoral student (2009-), Fluid effects in the mechanics of accretionary wedges

and in fold-and-thrust belts.

G. Kampfer, Doctoral student (2007-2010), Fractures and folding in carbonates, sponsored

by Shell IEP (Holland). Co-advisor with B. Maillot (University of Cergy-Pontoise).

P. Souloumiac, Doctoral student (2005-2009) Sismic cycle and orogeny Co-advisor with A.

Modaressi (Ecole Centrale de Paris)

N. Cubas, Doctoral student (2005-2008) Kinematics and mechanics of folding in fold-and-

thrust belts Co-advisor with B. Maillot (University of Cergy-Pontoise). Price for best pre-

sentation by junior speaker at the AGU2008, Tectonophysics.

N. Kallel, Doctoral student, (2002-2006) Diffuse fracturing and the folding of sedimentary

layers. Co-advisor with W. Sassi (I.F.P.)

A. Savitski : post-doc (2001-2002), Intergranular Pressure Solution.

M. Guiton : post-doc (2001), Fractures in folded reservoirs, for Total-Fina-Elf.

H. Raimbourg, Doctoral student (2001-2005), Eclogitization in subduction zone: application

to the Bergen’s arc, Norway. Co-advisor with Prof. L. Jolivet (Paris VI).

M. Rakotoniriana, Doctoral student, (2001-2005) Intergranular Pressure Solution. Co-

advisor with J. Raphanel (L.M.S.)

F. Gueydan, Doctoral student (1998-2001), The Ductile to brittle transition in the Earth’s

lower crust. Co-advisor with Prof. L. Jolivet (Paris VI).

M. Guiton, Doctoral student (1997-2001), Diffuse brittle deformation and the folding of

sedimentary layers . Co-advisor with W. Sassi (I.F.P.)

J. Ghoussoub, Doctoral student (1996-2000), Solid-Fluid Phase transformation: pressure

solution. Price for best thesis, Ecole des Ponts et Chaussées.

L. Bodin, Doctoral student (1993-96), Adiabatic shear banding. Co-advisor with Prof. A.


P. Onck, M.Sc. student at the University of Delft (1992-93) in the Mathematics and Com-

puter Sciences Department. Co-advisor with Prof. Wesseling

P. Massin, Ph.D student at the University of Michigan (1991-94) in the Aerospace Depart-

ment. Co-advisor with Prof. N. Triantafyllidis

O. Chapuis, research engineer at Shell Research (1990-91), after his graduation from the

University of Metz, France.


Clark B. Millikan Visiting Professor of Aeronautics,

California Institute of Technology (2003-04)

IACMAG 94 Award for Significant Paper (Finite-Element analysis for strain localization

in frictional materials, with M. Ortiz, Int. J. Num.& Analyt. Methods in Geo., 1989)

Brown University fellowship, U.S.A. (1984)

Fellowship from the “Minist`ere des Affaires Etrang`eres”, France (1981)

Invited Seminars and Lectures:

Univ. of Texas, Austin (Aero.), 2009 Univ. of Cambridge (ITG), 2010

University of Salzburg, 2009 Graduate Univ. Chinese Acad. Scs., 2009-

University of Bristol, 2009 Caltech (Tectonics Observatory), 2009

MécaDymat, 2008 Université Paris XI, 2008

University of Salzburg, 2006 ETH Zurich, 2007

ENS Cachan, 2006 Université Paris VI, 2005

Marseille (LMA, CNRS), 2005 IPGP (Sismologie), 2005

Stanford (Geo. & Env.), 2004 Univ. of Texas, Austin (Aero.), 2004

Brown (Eng.), 2004 Brown (Geology), 2004

Caltech, (Mech. Eng.), 2003 Caltech (Sismo-Lab) 2004

University of Graz, Geology, 2000,02 Caltech (Mech. Eng.) 2000

IUTAM, Austin USA 2001 Kongsberg , Norway 2000

Northwestern University, USA, 1999 University of Cambridge,UK, 1999

IUTAM, Delft, 1997 école Normale Supérieure, 1997

Université de Montpellier, Géologie, 1997 école Nat. Sup. des Techniques Avancées 1996

Harvard University, 1996 University of Bonn, 1996

Institut Fran¸cais du Pétrole, 1996 University of Grenoble (L3S), 1996