RayGUI 2.0: A Graphical User Interface for Interactive Forward and Inversion Ray-Tracing; Open file rept

摘要

RayGUI 2.0 is a graphical user interface of the rayinvr program, a widely-used package for a 2-D forward modeling and inversion of seismic rays in an isotropic medium on UNIX workstations. RayGUI 2.0 uses a new code, JAVA 1.3, which is independent of the code used for RayGUI 1.x - A graphical 2-D ray-tracing interface for UNIX. RayGUI 2.0 can be used on computers with either Linux, Unix or MAC-OS X operating systems. The graphical interface greatly facilitates the use of rayinvr, which currently requires text-editing of the velocity model and has a rigid display of model and traveltimes. RayGUI2.0 enables the user to graphically edit a subsurface velocity model and change the ray-tracing parameters. The medium consists of distinct layers with velocity values defined at their tops and bases. Velocities can vary laterally along a given layer, and layers can pinch out. Ray-tracing is performed by converting the RayGUI velocity model into rayinvr format and invoking rayinvr from within RayGUI. The modeled rays are plotted in the window of the velocity model. Observed and calculated traveltimes are displayed for comparison to test the velocity model. The display parameters are controlled interactively. The speed has been greatly improved from previous version. The new version no longer has a speed limitation that prevented the user from modeling multiple arrivals from multiple shots. FORTRAN 77 and ANSI-C are required to compile rayinvr and some auxiliary programs. The rayinvr code had to been modified to allow compilation on Linux and MAC operating systems.