The reconstruction of sound speed in the Marmousi model by the boundary   control method
  We present the results on numerical testing of the Boundary Control Method in the sound speed determination for the acoustic equation on semiplane. This method for solving multidimensional inverse problems requires no a priory information about the parameters under reconstruction. The application to the realistic Marmousi model demonstrates that the boundary control method is workable in the case of complicated and irregular field of acoustic rays. By the use of the chosen boundary controls, an `averaged' profile of the sound speed is recovered (the relative error is about $10-15\%$). Such a profile can be further utilized as a starting approximation for high resolution iterative reconstruction methods. 
I. B. Ivanov, M. I. Belishev, V. S. Semenov
physics.geo-ph physics.comp-ph