Combining F90 and PVM to construct synthetic seismograms by ray-tracing

For modelling marine reflection seismic records, a fairly simple ray-tracing algorithm has been implemented. Nevertheless, the program can model multiple echoes, in a 2D medium with few homogeneous isotropic layers but of any shape. Opportunities exist for enhancement with ray-conversion, energy attenuation, and the addition of a reflectivity amplitude. Yet most of the emphasis is put on the methodology used to have benefit of a new programming language, namely Fortran 90, and a new programming environment, the use of distributed systems over a network, thanks to the Parallel Virtual Machine library. The combination of both tools opens access to the vectorisation and parallelisation technics at the cheapest implementation cost. Specific algorithmic details are explained and the displayed results are all related to the programming effort