NAME

     psvspec  -  Construct Vs/Vp spectra for P-S  converted  wave
     data.

SYNOPSIS

     psvspec [ -NInputFileName ] [ -OOutputFileName ] [ -Vpikvpik
     ]  [  -tminstart  ]  [  -tmaxstop  ]  [  -nsStartTrace  ]  [
     -neEndTrace  ]  [  -rsStartRecord  ]  [  -reEndRecord  ]   [
     -nvsvpnvsvp  ] [ -vsvp0vsvp0 ] [ -vsvp1vsvp1 ] [ -igtigt ] [
     -dmuldmul ] [ -tmultmul ] [ -thldthld ] [ -V ] [ -?  or   -h
     ]

DESCRIPTION

     psvspec constructs a Vs/Vp spectrum for  P-S  converted-wave
     data.  psvspec  reads  in P-S converted-wave seismic data in
     SIS format along with corresponding  P-wave  velocity  picks
     from  a  separate  file. The velocity picks can be in any of
     the common pick-file formats: XSD pick file,  Disco  HANDVEL
     velocity  file,  TDFN  velocity card images, or "flat" file.
     Using the P-velocity information from the pick file, psvspec
     performs  a  non-hyperbolic  Vs/Vp  ratio  coherency scan on
     either CSP or CCP  gathers.  The  output  is  an  SIS-format
     velocity-ratio  analysis panel, showing coherency as a func-
     tion of Vs/Vp ratio and two-way travel time (down P-wave, up
     S-wave).  This  data can be viewed directly or used with the
     program "cvd" to perform interactive  Vs/Vp-ratio  analysis.
     Detailed theoretical development is descripbed in the report
     "Nonhyperbolic Vonverted Wave Velocity Analysis  and  Normal
     Moveout", F95D42.


  Command line arguments
     -N InputFileName  [default: stdin]
          Enter the input data file name. The input data can be a
          Common Source Point (CSP), or a Common Conversion Point
          (CCP), or a Common Depth Point (CDP) gathered dataset.

     -O OutputFileName  [default: stdout]
          Enter the output  data  file  name.  The  output  is  a
          velocity-ratio  analysis  panel  showing coherency as a
          function os Vs/Vp ratio and two way travel  time  (down
          P-wave, up S-wave).

     -Vpik vpik  [No default]
          The corresponding P-wave velocity pick file. All of the
          pick-file  formats commonly in use at Amoco (XSD, TDFN,
          Disco HANDVEL, USP) are supported by psvspec. The  pick
          file format is automatically detected.

     -tmin start (default = 0, beginning of trace).
          Starting time of traces in milliseconds.

     -tmax stop (default = end of trace).
          End time in each trace for analysis in milliseconds

     -ns StartTrace  [default: 1]
          The start trace number.

     -ne EndTrace  [default: last trace of record]
          The end trace number.

     -rs StarRecord  [default: 1]
          Start record number.

     -re EndRecord  [default: last record]
          End record number.

     -nvvsvp nvsvp (default =101)
          Maximum number of velocity ratios to use spaced between
          vsvp0 and vsvp1

     -vsvp0 vsvp0 (default = 0.3)
          Minimum velocity ratio value input.

     -vsvp1 vsvp1 (default = 0.8)
          Maximum velocity ratio value input.

     -igt igt (default = 8)
          An integer value to give the time-gate  window  T  cen-
          tered  at  t  at  time t(0).  The half-time gate T/2 is
          related to igt by T/2=igt*dt, where dt  is  the  sample
          interval in ms.

     -dmul dmul (default=1.0)
          Multiply each distance, itr(117), by this factor.  This
          is  useful  when  the  header  has different units than
          expected.

     -tmul tmul (default=1.0)
          Multiply the sampling interval,  dt,  by  this  factor.
          This is useful if the sampling interval is in different
          units than expected.

     -thld thresh
          Semblance threshold: semblances less  than  this  value
          will  be  zeroed.   Default = 0.0 (no thresholding).  W
          ith the -fI-A option (max  semblances  scaled  to  1.0)
          this represents a relative thresholding.

     -V   Enter the command line argument '-V' to get  additional
          printout.

     -? or -h
          Enter the command line argument '-?'  or  -h  or  -help
          to  get  online help.  The program terminates after the
          help screen is printed.

BUGS

     There probably are some bugs waiting to be found.

SEE ALSO

     cvd(1), psnmo(1), ccpbin(1) , ccpstk(1)

AUTHOR

     Yaohui Zhang

COPYRIGHT

     copyright 2001, Amoco Production Company
               All Rights Reserved
          an affiliate of BP America Inc.