A Program for Rapid Computation of Multioffset Vertical Seismic Profile Synthetic Seismograms for Layered Media

Abstract : PNSEB is a set of FORTRAN programs for calculating the response of a layered elastic medium using the reflectivity method as described in Mallick and Frazer (Practical Aspects of Reflectivity Modeling, Geophysics 52, 1355-1364, 1987; Rapid Computation of Multi-offset VSP Synthetic Seismograms for Layered Media, Geophysics 53, 479-491, 1988). PNSEB consists of two basic modules, each of which consists of more than one major option. The first module, PNSN, calculates the earth's response (Green's function) in frequency-wavenumber (omega-p) space. Using the proper option, the program can calculate the response at very small or very large offsets. No lateral variability or anisotropy are allowed, but the full response including interface waves is calculated. The second module, PNSYN, in its main form converts the output from PNSN to time- distance (t-x) space, which can then be plotted by the VSPLT module or by other plotting packages. The program has been written and optimized for vector computers, such as a Cray or Convex, but also runs well on scalar computers such as Sun workstations.

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