CNRS Research Director (Directeur de Recherche CNRS)
Laboratory of Mechanics and
Acoustics, CNRS/University of Aix-Marseille, France
(je suis français, vous pouvez m'écrire aussi en français)
My
name is Dimitri Komatitsch, I am a CNRS Research Director (Directeur de Recherche CNRS)
in the Laboratory
of Mechanics and Acoustics at CNRS/University of Aix-Marseille, France.
My ORCID ID is 0000-0003-2309-8269 and my ResearcherID is E-7153-2012.
Associate editor of Geophysics
and of Heliyon.
You can find my publications here.
My research interests include adjoint/inverse imaging problems based on acoustic waves in industrial, oceanic or geophysical structures, and the study of associated effects related to strong local heterogeneities and/or steep topography,
as well as the numerical study of acoustic or seismic wave propagation in complex media.
I also work on numerical modeling and imaging in the context of non destructive testing.
I use a variational formulation of the equations of elastodynamics, and solve
it in three dimensions (3-D) using the so-called spectral-element method, a high-order
version of the finite-element method, which can be shown to be very
accurate at low cost, and particularly well suited to an efficient
implementation on parallel computers. This work is done in
collaboration with Prof. Jeroen Tromp at Princeton University (USA)
and Prof. Qinya Liu at Toronto University (Canada). We apply such
numerical techniques to the study of wave propagation both at the
scale of the Earth and in sedimentary basins, in particular in
Southern California. The full source code of our software package
SPECFEM is available open source from Geodynamics.org.
I collaborate with Dr. Sébastien Chevrot from CNRS in Toulouse (France) on future new hybrid techniques for imaging of geological structures
based on high-frequency body waves, which have the potential of drastically improving the resolution of current tomographic pictures.
I actively work with Dr. Zhinan Xie from University of Harbin (China),
Roland Martin from University of Toulouse/CNRS (France) and
Steven D. Gedney (University of Kentucky, USA) on optimized and
stabilized unsplit Perfectly Matched Layers, called unsplit
Convolutional PML (C-PML) absorbing layers, for the seismic wave
equation. We have developed unsplit Convolutional PMLs for isotropic
and anisotropic media (Komatitsch and Martin, 2007) using a
finite-difference in the time domain (FDTD) technique based on ideas
introduced by Roden and Gedney (2000) in the context of
electromagnetic wave propagation. We have also applied these ideas to
poroelastic media (Martin, Komatitsch and Ezziani, 2008) and
developed a stabilized variational form for isotropic or strongly
anisotropic media modeled using high-order finite elements (Martin,
Komatitsch and Gedney, 2008). For more details about PML and C-PML,
see for instance Wikipedia
about PML as well as our publications.
For more details about finite differences in the time domain (FDTD),
see for instance Wikipedia
about FDTD. All our C-PML source codes are available open source.
I also collaborate with Dominik Göddeke (University of Stuttgart, Germany) on GPU computing (i.e., computing on graphics
cards) for seismic wave propagation. For more details, see our
publications.
Our laboratory is affiliated with CNRS
as a joint research unit (UMR 7031). Before working in Marseille, I
was a Professor at University of Pau, France from 2004 to 2010, at
CNRS lab UMR 5212 (Laboratory of Modeling and Imaging in
Geosciences), of which I was the Director from 2007 to 2010 and
Deputy Director in 2005 and 2006; and then a Professor at University
of Toulouse, France, at CNRS lab UMR 5563 (Laboratory of Geosciences and Environment).
I
was also a member of Institut universitaire de France (IUF) from 2007 to 2012 (non renewable).
With
some colleagues, in 2005 we founded an INRIA research project-team
called MAGIQUE-3D.
I collaborated with Swaminathan Krishnan from Caltech, USA, on the study of strong ground motion
in Southern California, and on the three-dimensional nonlinear
analysis of buildings based on his software package Frame3D.
I also worked with Christian Gout from INSA Rouen, France,
on better ways of approximating surfaces with large local variations, such as topographic and
bathymetric elevation models, or complex three-dimensional geological structures with faults.
I collaborated with Jesús Labarta (Barcelona
Supercomputing Center, Catalunya, Spain) on optimizing high-order
finite-element codes on SMP machines. We analyzed our codes using
their ParaVer/DimeMás performance analysis software package.
Before working in France, I was a Senior Research Fellow in Scientific
Computing and Geophysics in the Division
of Geological and Planetary Sciences at Caltech
(California Institute of Technology) in Pasadena, California, USA,
and in the Department of Earth
and Planetary Sciences at Harvard University in Cambridge, Massachusetts, USA, for five years.
I am a member of the American
Geophysical Union (AGU),
of the Society of Exploration Geophysicists (SEG) and of the French Acoustical Society (SFA).
List of publications
Curriculum
Vitae
SPECFEM software packages (SPECFEM2D and SPECFEM3D)
SEISMIC_CPML software package
Our CHEESE Center of Excellence European project (led by BSC in Barcelona, Nov 2018 - Oct 2021) Future offical Web page (will open in Dec2018)
Our ETN WAVES European project (led by UPMC in Paris, ending in Dec 2018)
Four old and very hard-to-find texts about oceanic T waves, and two about the adjoint method for imaging and inversion
How to write a good paper title or abstract (easily!)
Fondation Simone et Cino del Duca
ShakeMovie Caltech
Global_ShakeMovie Princeton
Genealogy: my ancestors / Généalogie: mes ancêtres
Movie of the propagation of a plane shear wave in a concrete block in non-destructive testing
computed with our acoustic wave propagation code SPECFEM:
Movie of seismic waves propagating in Mars following a meteoritic impact. Movie created using our code SPECFEM3D_GLOBE for the launch of the InSight Mission on May 5, 2018:
Movie of the May 12,
2008, Sichuan (China, Ms = 8.0, Mw = 7.9) earthquake computed at
CINES/GENCI (Montpellier, France) with our 3D seismic wave
propagation code SPECFEM:
June 2010: a
multi-GPU port of SPECFEM wins the BULL Joseph Fourier
supercomputing award:
May 2005: our 3D
seismic wave propagation code SPECFEM on the cover of "Science",
for the calculation of the great Sumatra-Andaman earthquake of
December 26, 2004.
November 2003:
SPECFEM wins the ACM Gordon Bell Award for Best Performance at the
ACM/IEEE SuperComputing'2003 conference in Phoenix, Arizona:
Read
our Gordon Bell
Award paper
See the Press release
The
source code of SPECFEM is available open source from
Geodynamics.org.
Dimitri Komatitsch
Laboratoire de Mécanique et d'Acoustique (LMA)
UMR 7031 AMU-CNRS-ECM
Bureau 120
8 rue Enrico Fermi
13453 Marseille cedex 13
FRANCE
For visitors, here is how to reach our building.
In Google Maps or in your GPS if you cannot find "Impasse Nikola Tesla" look for "Rue Enrico Fermi" instead, the lab is at the intersection of both.
email:
(preferred)
(je suis français, vous pouvez m'écrire aussi en français)
Phone:
(+ 33) 4 84 52 42 52 (please use email instead if possible)
Administrative assistant: Ms. Stéphanie LIEUTAUD (+ 33) 4 84 52 56 06
Dimitri Komatitsch, Last update: September 2018, © 2018, all rights reserved.