Running BVAX

This program measures surface wave dispersion. The bvax code has a number of outputs:

• bvaxnnnn.lst Output listing, nnnn.seg would be the input file.
• bvax.ps Post script plot file of measured dispersion.
• bvaxqc.ps QC multipage plot, one page for each frequency.
• bvax.his Text file with 5 columns: [Frequency, Phase Velocity, Velocity Uncertainty (1 Stdv), Semblance, Tbar (mean), Tvar (variance)]
• semblance.dat Text file, 3 columns: [Frequency, Phase Velocity, Semblance] used to generate Gnuplot files.
• CLRplot.gp This is a Gnuplot file that generates a color map of dispersion semblance values.
• clrplot.png BVAX automatically generated image from CLRplot.gp
• CNTplot.gp This is a Gnuplot file that generates a contour plot of dispersion semblance values.
• cntplot.png BVAX automatically generated image from CNTplot.gp
• MSHplot.gp This is a Gnuplot file that generates a mesh image of semblance values.
• GRYplot.gp This is a Gnuplot file that generates a grey plot image of semblance values.

Figure 41: Color plot of semblance for example soil profile of Figure 42. The fundamental mode appears as red. A weaker higher mode is also visible as a lighter shade of blue.