bvax infile xmin xmax vmin vmax nvel . . . fmin fmax delf bwd iskp ivscn infile =input file name xmin =minimum offset (float) xmax =maximum offset (float) vmin =minimum velocity vmax =maximum velocity nvel =number of velocity increments fmin =minimum frequency Hz fmax =maximum frequency Hz delf =frequency increment Hz bwd =filter bandwidth Hz iskp =skip filtering (if files already exist) 1=YES 0=NO (-1=NO and delete when done) ivscn =output velocity scan data sets 1=YES 0=NO EXAMPLE: bvax c008.seg 1.0 100. 100. 500. 200 10. 50. 1. 1. -1 0
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There are some useful data at the frequencies above and below the 20-30 Hz range. The file, bvax.his should be edited to remove questionable data with a lot of scatter (perhaps due to higher modes), or in some cases where zero velocity is returned due to a failure to find a phase velocity. That happens when the range of velocities scanned is too limited, or when there is no signal. Once edited, an inversion in Octave can be done with program invR1.m.