Austin 2013

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First Madagascar Working Workshop

Working Workshops as opposed to "talking workshops" are meetings where the participants work together (possibly divided into pairs or small teams) to develop new software code or to conduct computational experiments addressing a particular problem.



The objectives of the workshop are

  1. To expand Madagascar's collection of reproducible papers. New reproducible papers may include papers written using Madagascar programs as well as papers written using other open-source software tools.
  2. To create and expand a seismic migration gallery. Migration gallery is a matrix where rows are different benchmark datasets and columns are different seismic migration algorithms.


July 25-27, 2013.


Austin, TX, USA.


The workshop participation is free but requires an application. To apply, please fill an application form. You need to make a case for your participation in the workshop:

  • To contribute a reproducible paper.
  • To contribute an entry to the migration gallery.
  • To serve as an apprentice to someone working on one of the first two tasks.

The application deadline is July 1, 2013.

Migration Matrix

Stolt Phase-shift Velocity continuation One-way wave equation Lowrank RTM FFD RTM First-arrival Kirchhoff Multi-arrival Kirchhoff
Constant velocity x x x x x
Constant velocity gradient x x x
Marmousi x x x x x
Sigsbee x x x x
BP-2004 x
Model94 x
BP-1997 2.5D x x x x
Hess VTI x x
BP-2007 x
SEG/EAGE Overthrust x


Constant velocity

A model from Landa et al. (2008) and Klokov and Fomel (2012). The data are generated by Kirchhoff modeling in constant velocity of 1 km/s.

Landa, E., S. Fomel, and M. Reshef, 2008, Separation, imaging, and velocity analysis of seismic diffractions using migrated dip-angle gathers: SEG Technical Program Expanded Abstracts, 27, 2176-2180.

Klokov, A., and S. Fomel, 2012, Separation and imaging of seismic diffractions using migrated dip-angle gathers: Geophysics, v. 77, S131-S143.

Constant gradient

A model similar to the one used by Baina et al. (2002).

Baina, R., P. Thierry, and H. Calandra, 2002, 3D preserved-amplitude prestack depth migration and amplitude versus angle relevance: The Leading Edge, 21, 1237-1241.


The Marmousi model was created in 1988 by the Institut Français du Pétrole (IFP) in 1988. The geometry of this model is based on a profile through the North Quenguela trough in the Cuanza basin. The geometry and velocity model were created to produce complex seismic data which require advanced processing techniques to obtain a correct earth image (Versteeg, 1994). The Marmousi dataset was used for the workshop on practical aspects of seismic data inversion at the 52nd EAEG meeting in 1990.

Versteeg, R., 1994, The Marmousi experience: Velocity model determination on a synthetic complex data set: The Leading Edge, 13, 927-936.


The Subsalt Multiples Attenuation and Reduction Technology Joint Venture (SMAART JV) publicly released several data sets between September 2001 and November 2002. These synthetic data model the geologic setting found on the Sigsbee escarpment in the deep water Gulf of Mexico. Additional information may be found at The data sets remain the property of SMAART and are used under the agreement found at the SMAART site listed above.


The model was developed as a velocity-analysis benchmark dataset, in conjuction with the workshop ``Estimation of Accurate Velocity Macro Models in Complex Structures at the 2004 EAGE meeting in Paris, France (Billette and Brandsberg-Dahl, 2005).

Billette, F. J., and S. Brandsberg-Dahl, 2005, The 2004 BP velocity benchmark: 67th Annual EAGE Meeting, EAGE, Expanded Abstracts, B305.


This model representing a cross section through the foothills of the Canadian rockies. It was created for the paper (Gray and Marfurt, 1995). Provided at courtesy of BP and Joe Dellinger.

Gray, S. H., and K. J. Marfurt, 1995, Migration from topography: Improving the near-surface image: J. Can. Soc. Expl. Geophys., 31, 18-24.


This model was created by Mike O'Brien under the supervision of Carl Regone at the Amoco Tulsa Technology Center in 1994, as part of a project to study methods for attacking statics in land data. The geology of the model is completely invented, not based on any specific play. It contains many different types of near-surface geology, generally representing geology thought to be responsible for statics. The model is 2D, purely acoustic, with a constant density. It was used in two internal Amoco reports but was never published externally by Amoco.

BP-1997 2.5D

John Etgen describes this model as ''The Carpathians thrusting over the North Sea''. It was created for the 1998 SEG talk (Etgen and Regone, 1998) and is also mentioned by Dellinger et al. (2000). It is provided courtesy of BP.

Etgen, J., and C. Regone, 1998, Strike shooting, dip shooting, widepatch shooting - Does prestack depth migration care? A model study.: 68th Ann. Internat. Mtg, Soc. of Expl. Geophys., 66-69.

Dellinger, J. A., S. H. Gray, G. E. Murphy, and J. T. Etgen, 2000, Efficient 2.5-D true-amplitude migration: Geophysics, 65, 943-950.

Hess VTI

The Hess VTI model was generated at Hess Corporation.