Geogiga DW Tomo 9.3 — Refraction Tomography Software

Refraction Tomography does not require layer assignment and phantom time-distance curves. The complex velocity structure can be directly estimated from first arrivals. This approach is especially suitable to derive the structure with no distinct layer interface due to the gradual velocity change where the traditional refraction interpretation methods are invalid.

DW TOMO utilizes the robust grid ray tracing and regularized inversion with constraints in tomography. The estimated velocity model can also be used for static correction in seismic reflection data processing.


  • Automatically or manually pick first arrivals with a trace magnifier
  • Overlay shear wave recordsnew
  • Robust grid ray tracing
  • Regularized iterative inversion with constraints
  • Build an initial layered gradient model based on traveltime curves
  • Load a velocity file or interactively build an initial model
  • Allow rough ground surface
  • Check the picked and calculated first arrivals directly on seismic traces
  • Fitting error analysis
  • Interactively pause and resume or stop the tomography procedure
  • Simultaneously update the display of first arrivals and ray paths
  • Review the inverted model in each iteration
  • Overlay velocity section with ray paths
  • Trim velocity section by the coverage of rays or receiver locations new
  • Plot well data on the velocity section
  • Plot velocity section with colors, contours, and editable lithologic symbols
  • Load all shots at one time
  • Merge multiple TT curve files into one file
  • Check and assign geometry with layout chart
  • Input geometry as slope or horizontal distance for seismic data collected across topography
  • Trigger delay correction
  • Filter and scale seismic data with support of undo and redo functions