- FEATURES AND OPTIONS -
Travel times (or amplitudes) can be processed to calculate velocities (or attenuation). Sources and receivers can be in anywhere within a 3-D grid. Anisotropy can be specified for each grid point. Ray paths can be straight or curved. Options for using site information to improve 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 uncertainty in site knowledge
Adjustable damping and smoothing to reduce small-scale variations in calculated velocity.
GeoTomCG runs under Windows© and provides graphical displays of velocities, ray paths, ray path densities, and other parameters for inspecting results and preparing preliminary reports. These displays can be copied and pasted with Windows clipboard. Quality control plots include travel time vs. distance, residual vs. ray path angle, velocity vs. ray path angle, common-source and common-receiver gathers, and others. It also provides 3D numerical results and 2D slices of 3D grid as ASCII files which can be read by commercial 3D and 2D visualization programs for preparing formal reports and presentations. Two sets of results can be compared by differences or ratios. User manual describes processing of seismic and electromagnetic data. Examples with files allow user to practice travel time and amplitude data processing. The separated time and amplitude picking program TomTime provides output in the format used as input for GeoTomCG. It provides versatile filtering and display options for noisy data and for S-wave overlays.
- FEATURES AND OPTIONS -
Travel times (or amplitudes) can be processed to calculate velocities (or attenuation). Sources and receivers can be in anywhere within a 3-D grid. Anisotropy can be specified for each grid point. Ray paths can be straight or curved. Options for using site information to improve 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 uncertainty in site knowledge
- Adjustable damping and smoothing to reduce small-scale variations in calculated velocity.
GeoTomCG runs under Windows© and provides graphical displays of velocities, ray paths, ray path densities, and other parameters for inspecting results and preparing preliminary reports. These displays can be copied and pasted with Windows clipboard. Quality control plots include travel time vs. distance, residual vs. ray path angle, velocity vs. ray path angle, common-source and common-receiver gathers, and others. It also provides 3D numerical results and 2D slices of 3D grid as ASCII files which can be read by commercial 3D and 2D visualization programs for preparing formal reports and presentations. Two sets of results can be compared by differences or ratios. User manual describes processing of seismic and electromagnetic data. Examples with files allow user to practice travel time and amplitude data processing. The separated time and amplitude picking program TomTime provides output in the format used as input for GeoTomCG. It provides versatile filtering and display options for noisy data and for S-wave overlays.
