Geogiga Surface 9.3 — Surface Wave Data Processing Software

SURFACE is able to process active surface waves with SASW and MASW. The dispersion spectrum can be calculated in F-K, F-V, or F-P domain, where the fundamental and higher-mode dispersion curves are interactively picked. The robust forward modeling and the global genetic algorithm (GA) assure the quick convergence of inversion.


  • Load all shots simultaneously, browse and select any record for QC
  • Input and plot the elevation of a survey line
  • Mute noise in time domain and select traces for dispersion analysis
  • Test the apparent velocity of surface waves on seismic data
  • Check frequency range with amplitude spectrum analysis
  • Process active surface waves with SASW and MASW
  • Calculate dispersion spectrum in F-K, F-V, or F-P domain
  • Automatically pick dispersion curves with a predefined frequency interval and decimate the picks if needed
  • Interactively pick fundamental and higher-mode dispersion curves with a spectrum graph
  • Handle both Rayleigh and Love waves
  • Automatically build an initial model based on the curvature of dispersion curve or thickness of layers
  • Interactively define an initial model with the constraint of apparent Vs
  • Specify Poisson's ratio and density for each layer of an initial model
  • Allow fixed layers in inversion
  • Jointly invert fundamental and higher-mode dispersion curves with genetic algorithm (GA)
  • Define the search range of velocity or thickness for each layer in the inversion
  • Allow the inversion of dispersion curve constrained by the trend of initial velocity modelnew
  • Auto select and invert all the dispersion curves at one time
  • Interactively pause and resume or stop the inversion procedure
  • Calculate apparent Vs, Vs30(or Vs100), depth-weighted velocities, and SPT-N values
  • Plot dispersion and velocity curve at a single location
  • Compare different dispersion and velocity curves at the same location
  • Display the dispersion curves and velocity section along a line
  • Trim the velocity section based on the depth of the deepest layer above the half-spacenew
  • Plot well data on the velocity section
  • Output velocity section with contours and editable lithologic symbols