[CIG-SEISMO] time reversed computation in specfem2d

[pge05bqw at studserv.uni-leipzig.de]

Hello,
i'am trying to add a time reversed computation to specfem2d. First I  
thought it would be enough to change sign of deltat(and deltatcube...)  
after some time iteration steps(e.g. half of NSTEP). But it doesn't  
seem to be that easy, because it leads to a extremly big maximum norm  
of vector field, which aborts the program.
Does anyone have an idea how this could work?
Thanks,
Jörg Buchwald
Student
University of Leipzig

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