Development of an X-Windows Tool to Compute Gaussian Beam Synthetic Seismograms

The principal goal of this project was to create an X-Windows-based graphics tool to compute rapidly and efficiently, synthetic seismograms for laterally heterogeneous, two-dimensional 2-D, isotropic velocity models using the Gaussian beam method and to integrate that tool the software environment at the Center for Seismic Studies CSS. Existing Gaussian beam software is written in Fortran code and is often very cumbersome to use. By constructing an X- Windows Graphical User Interface GUI to augment the original code, much of the tedium of introducing lateral heterogeneity into 2-D velocity models is eliminated. The tool can be used to aid the interpretation of waveforms or to study how lateral structure and the sources location within that structure impact arrival times and waveform shape. This report contains an outline of the systems functionality and a description of several accuracy tests which were performed. A Users Manual is provided separately as report TGAL-93-02 Users Guide to Xgbm An X-Windows System to Compute Gaussian Beam Synthetic Seismograms. This latter document and the code itself are available by anonymous ftp from CSS.