During the past six months, the two-dimensional finite difference synthetic seismogram code was installed and run on a
number of different computer systems. The results were compared for timing, accuracy and the ease with which the code was
adapted to each system. This report documents the software modifications and the method used to implement the finite difference code on each
computer, and presents the results of the benchmark survey.Funding was provided by the Office of Naval Research
under Contract No. N00014-89-J-1012