Geo Tom - Version GeoTomCG - Tomographic Software For Windows
GeoTomCG can process crosshole or VSP seismic or radar data. The display shows calculated radar velocities. High velocity zone at depth of 27 m is caused by an abandoned mine. Other zones of contrasting velocities are geological features. S and R indicate source and receiver positions, respectively.
Traveltimes can be processed to calculate velocities, or amplitudes processed to calculate attenuation coefficients. Sources and receivers can be in any configuration within a 3-D grid. Anisotropy can be specified for each point of the grid. Raypaths can be straight or curved. Options for constraining the inversion to improve the reliability of results include:
- Maximum and minimum calculated velocities.
- Constant velocity in user-selected areas or volumes in the grid.
- Groups of nodes with similar velocities, such as horizontal layers or vertical columns.
- Constraints that take into account the uncertainty in site knowledge.
- Adjustable damping and smoothing to reduce small-scale variations in calculated velocity.
GeoTomCG provides graphical displays of velocities, raypaths, raypath densities, and other parameters for inspecting results and preparing preliminary reports. These displays can be copied to the Windows clipboard and pasted into documents. Plots for quality control include traveltime versus distance, residual versus raypath angle, velocity versus raypath angle, and others. It also provides 3-D numerical results and 2-D slices of the 3-D grid as ASCII files that can be read by commercial 3-D and 2-D visualization programs for preparing formal reports and presentations. Velocities or amplitudes in two sets of results can be compared by differences or ratios.