Explanation of genwav parameters

• xnear near offset in meters
• delx spacing between channels in meters
• nrec number of receivers (ie. traces in shot gather)
• minimum group velocity expected used in estimating needed record length.
• tmax length of traces in seconds (need not match the recommended, depending on gendis run).
• fsamin sample interval in time, seconds
• fmin, fmax minimum and maximum frequencies. Recommend that these be wider than what you think you need, then filter back for your final result using a filter program (like BFIL). NOTE: Wavelet used is minimum phase, set by fmin and fmax.
• maximum mode to include Must be $modemax \le 9$
• ksw dispersion plot, sets wavenumber (1=k) or velocity (0=c)
• mapmat Format for plots. Recommend Octave (Matlab)
• output option, irvsel signals will be vertical or inline radial.
• source depth depth of source in meters
• moment tensor diagonal (radial,transverse,vertical). 0,0,1 is a vertical impulse. You can edit the waves.d file if you want a double couple instead.

The waves.d listing for this example:

 &waves
  ksw= 0, stepz=20,
  modes=1,2,3,4,5,6,7,8,9,
  fmin=    1.0000, fmax=  100.0000,
  fsamin=   0.00100,
  curve='earth.crv', 
  mapmat=0,
  matlb1='matc.m',   scilb1='matc.sci', 
  matlb2='matu.m',   scilb2='matu.sci', 
  irvsel=0,
  ofile='waves.tmp', /
  &source
  tm= 0.0, 0.0, 0.0,
     0.0, 0.0, 0.0,
     0.0, 0.0, 1.0, /
  sz=    0.00, sy=0.00, sx=0.00, /
  &recvr
  nrec=24,
  rz=24*0.0, 
  ry=24*0.0, 
rx=      1.000,     2.000,     3.000,     4.000,     5.000,
     6.000,     7.000,     8.000,     9.000,    10.000,
    11.000,    12.000,    13.000,    14.000,    15.000,
    16.000,    17.000,    18.000,    19.000,    20.000,
    21.000,    22.000,    23.000,    24.000,
  /

This file can be edited in case the genwav options don't cover what you want. If you want only the fundamental mode, for example, change the modes line:
modes=1,0,0,0,0,0,0,0,0,
The irvsel parameter is an easy way to change between vertical or horizontal radial signals on the receivers. For guidance on the moment tensor, tmll, see Aki & Richards (1980)