NAME

     bsstk  -  Backscatter stack

SYNOPSIS

     bsstk [-N ntap] [-O otap] [-ip ipow]  [-dx  dx]  [-vr  vref]
     [-dt  dtms]  [-bw  beamwidth]  [-rs  istart] [-re iend] [-na
     nang] [-as angstrt] [-ai anginc] [-V] [-h] [-?]

DESCRIPTION

     bsstk produces a pseudo normal  incidence  time  section  by
     summing  a  suite of narrow band F-K filtered constant angle
     sections created by tau-p transform and a trace-record  sort
     (program  slnt  followed  by  memangs).  Each  F-K filter is
     designed to pass only the dips that lie in a narrow dip band
     around normal incidence for each angle section. This program
     does not  require  a  velocity  field;  the  output  stacked
     seismic  section  is  in  time. The output from bsstk can be
     used as an input to  a  poststack  depth  migration  program
     (e.g. kmcm, fxcmmig, cmmvzn).

     Program bsstk obtains its parameters from command line argu-
     ments,  and it reads the constant angle data from a USP com-
     patible seismic dataset.

  Command line arguments
     -N input
          Enter the filename of the constant angle input sections
          after  typing  -N.  This is a USP-formatted dataset and
          was created by program slnt followed by program memangs
          or angs.

     -O output
          Enter the filename of the output seismic  stacked  time
          section after typing -O.

     -ip ipow
          The exponent for power stacking.  The default is 1.

     -dx dx
          The trace spacing value (in ft or meters).

     -vr vref
          The reference velocity as specified  to  program  slnt.
          This must be correct.  There is no default.

     -dt dtms
          The input sample spacing value in ms.  The  default  is
          the value in the line header.

     -bw beamwidth
          The beamwidth is the angle (in  degrees)  defining  the
          narrow dip band.  A recommended value is 10 degrees.

     -rs istart
          This value is the first  record  to  process  from  the
          input  dataset.  The default is the first record on the
          input dataset.

     -re iend
          The value is the last record to process from the  input
          dataset.

     -na nang
          The number of angles on the input dataset.  This  value
          must match what is actually on the input dataset!

     -as angstrt
          This value is the starting angle (in  degrees)  on  the
          input  dataset.  Value  can  be negative but must match
          input!

     -ai anginc
          The value is the angle increment (in  degrees)  on  the
          input  dataset.  Value can be fractional but must match
          input!

     -V   Enter -V for a verbose printout.

     -h   Enter -h for online help. Program will terminate  after
          printing this.

     -?   Enter this (or '-?' if you are running in  c-shell)  to
          get  online  help.   The  program  will terminate after
          printing this.

SEE ALSO

     mbs, startjob, beginjob, endjob, slnt

BUGS

     None known.

AUTHOR

     N. D. Whitmore, Jr., Mary Ann Thornton, Ron D. Coleman

COPYRIGHT

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