Last modified 15 years ago Last modified on 06/02/2008 11:15:59 AM

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slowness vespagram

command: VESPA <slow1> <slow2> <slowstep> <azim> <power>

Computes vespagram from all traces of the display. For each slowness value from <slow1> to <slow2> in steps of <slowsteps> a beam trace is computed (using azimuth <azim>). On the summation the <power>-th root process is applied. <power>=1 means plain summation. The input traces are hidden after execution of this procedure. To get them back, enter the command "DISPLAY h:all". Each output trace corresponds to a slowness value. The slowness is given in the "comment"-entry of the trace. It is convenient to switch the trace info text to "comment" by the command "TRCTXT ^comment($x)".


  • <slow1>, <slow2> parameter type: real
    Slowness window. Units in deg/sec.
  • <slowstep> parameter type: real
    Step size within slowness window. Unit in deg/sec.
  • <azimuth> parameter type: real
    Beam azimuth in degrees.
  • <power> parameter type: real
    Before each summation the <power>-th root of the input traces is computed. The result trace is then taken to the <power>-th power.


vespa 3.0 7.0 0.2 23.3 1.
usual vespagram (plain summation)
vespa 3.0 7.0 0.2 23.3 4.
4-th root process on each summation

commands used