SURFACE

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 high-mode dispersion curves are interactively picked. The robust forward modeling and the global genetic algorithm (GA) assure the quick convergence of inversion.

Features

• Load all shots simultaneously, browse and select any record for QC
• Input and plot the elevation of a survey linenew
• 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 needednew
• Interactively pick fundamental and high-mode dispersion curves with a spectrum graph

• Handle both Rayleigh and Love wavesnew
• Automatically build an initial model based on the curvature of dispersion curve or thickness of layersnew
• Interactively define an initial model with the constraint of apparent Vsnew
• Specify Poisson's ratio and density for each layer of an initial modelnew
• Allow fixed layers in inversion
• Jointly invert fundamental and high-mode dispersion curves with genetic algorithm (GA)
• Define the search range of velocity or thickness for each layer in the inversionnew
• Auto select and invert all the dispersion curves at one timenew
• Interactively pause and resume or stop the inversion procedure
• Calculate apparent Vs, Vs30(or Vs100), depth-weighted velocities, and SPT-N valuesnew

• 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 sectionnew
• Output velocity section with contours and editable lithologic symbols