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Numerical performances of a hybrid local‐time stepping strategy applied to the reverse time migration
Author(s) -
Baldassari Caroline,
Barucq Hélène,
Calandra Henri,
Diaz Julien
Publication year - 2011
Publication title -
geophysical prospecting
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.735
H-Index - 79
eISSN - 1365-2478
pISSN - 0016-8025
DOI - 10.1111/j.1365-2478.2011.00975.x
Subject(s) - seismic migration , computer science , scheme (mathematics) , dispersion (optics) , spacetime , mathematical optimization , mathematics , discrete time and continuous time , space time , telmatology , regional geology , numerical analysis , algorithm , hydrogeology , geology , physics , mathematical analysis , geophysics , optics , statistics , geotechnical engineering , engineering , quantum mechanics , chemical engineering
The numerical simulation of wave propagation in heterogeneous media involves very significant computational costs that can be considerably reduced by using finite elements whose order is adapted to the characteristics of the medium. In this paper, we show that we can further reduce these costs by using a mixed time scheme, combining two discrete formulas and using local time steps. We illustrate the effectiveness of the new scheme considering an application to seismic imaging treated by reverse time migration. We also show that the new scheme greatly reduces the numerical dispersion problems that appear frequently when adapting the orders of approximation in space only.