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Welcome on the FWT2D download pages.

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FWT2D, 2D Full-Waveform Topography, is a massively parallel program which performs 2D frequency-domain modeling of acoustic wave propagation and full-waveform inversion for seismic imaging. FWT2D is more specifically designed to process wide-aperture (or global offset) seismic data.

MAIN FEATURES :

MODELING: Finite-difference frequency-domain (FDFD) modeling of visco-acoustic wave propagation
- Optimal FDFD stencil based on a parsimonious staggered-grid method, the mixed-grid strategy and anti-lumped mass
- Perfectly-Matched Layers (PML) and 45 degrees paraxial absorbing conditions
- Time-domain computation of synthetic seismograms
- Parallel resolution of the time-harmonic wave equation with efficient multiple-RHS solves using the massively parallel direct solver MUMPS http://graal.ens-lyon.fr/MUMPS and http ://mumps.enseeiht.fr/

INVERSION
- Non linear iterative steepest-descent algorithm
- Scaling of the gradient by the diagonal approximate Hessian
- Estimation of step length by parabolic fitting
- Processing of hydrophone and vertical geophone data
- Multiscale seismic imaging by succesive mono-frequency inversions
- Simultaneous multi-frequency inversion
- Parallel implementation of the gradient and diagonal Hessian

IMPLEMENTATION
- Possible sequential and parallel execution
- Languages: FORTRAN 90 (and MPI for parallel compilation)
- External calls (all the following softwares are freely distributed on the Web): MUMPS (massivelly parallel direct solver) http://graal.ens-lyon.fr/MUMPS and http://mumps.enseeiht.fr/, METIS ordering http://glaros.dtc.umn.edu/gkhome/metis/ called by MUMPS, BLAS (Basic Linear Algebra Subprograms) http://www.netlib.org/blas, (ScaLAPACK http://www.netlib.org/scalapack, BLACS (Basic Linear Algebra Communication Subprograms) http://www.netlib.org/blacs for parallel execution)

CONTENT OF THE PACKAGE
- Source code source of FWT2D
- Illustrative synthetic examples (modeling/inversion)
- Collection of shells to plot results of FWT2D based on graphic programs of Seismic Unix http://www.cwp.mines.edu/cwpcodes/ and GMT http://gmt.soest.hawaii.edu.
- Documentation
- Codes for time-domain analytical solution in homogeneous medium and 2D finite-difference time-domain modeling of acoustic wave propagation.
 
article rubrique
Thursday  22 November 2012
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Availability
Program FWT2D Two-dimensional Frequency-domain Full-Waveform Tomography for visco-acoustic media BASIC PROGRAM DESCRIPTION Frequency-domain full-waveform tomography for visco-acoustic (...) Read the whole article
Friday  15 March 2013
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Documentation
Two versions of the documentation are available : PDF documentation of FWT2D (3.4 Mb) Gzipped postscript version of FWT2D (10.8 (...) Read the whole article
Friday  15 March 2013
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Download
Software download page: Full waveform tomography in the acoustic approximation using one frequency at each step (obsolete) 2D ACOUSTIC V3 (tgz) (...) Read the whole article
Friday  15 March 2013
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References
References on finite-difference modeling of wave propagation and full-waveform inversion. References of the authors of FWT2D.V4.8. Wave propagation modelling by finite-difference (...) Read the whole article