NAME

     insult  - compute linear AVO trends

SYNOPSIS

     insult [ -Nntap ] [ -Ootap ] [ -istkistk ] [ -sist ] [ -eied
     ]  [  -nsnstr ] [ -nenetr ] [ -rsnrst ] [ -renred ] [ -V ] [
     -? ]

DESCRIPTION

     insult  takes  each  gather  assumed  to  be  isotime  (nmo)
     corrected, sample by sample fits a least squares straight to
     the amplitude as a function of  distance,  and  outputs  the
     intercept and slope at each time sample as trace pairs.  The
     output data then consists of trace pairs  for  each  gather:
     the  first  trace  is  the  intercept(t),  the second is the
     slope(t).

     insult gets both its data and its  parameters  from  command
     line  arguments.  These arguments specify the input, output,
     the start and end traces, the start  and  end  records,  and
     verbose printout, if desired.

  Command line arguments
     -N ntap
          Enter the input data set name or file immediately after
          typing -N unless the input is from a pipe in which case
          the -N entry must be omitted.  This input  file  should
          include the complete path name if the file resides in a
          different directory.  Example -N/b/vsp/dummy tells  the
          program to look for file 'dummy' in directory '/b/vsp'.

     -O otap
          Enter the output data  set  name  or  file  immediately
          after typing -O.  This output file is not required when
          piping the output to another process.  The output  data
          set also requires the full path name (see above).

     -istk istk
          Enter the number of far traces  to  stack  together  to
          build a weighting trace. Slope calculations do not care
          about the absolute magnitudes of trace amplitudes, e.g.
          very  small  amplitudes  can have very large slopes. To
          help mitigate this a weight trace is computed by taking
          the absolute value of the sum of the far traces (analo-
          gous to the enhanced restricted gradient  due  to  John
          Barton).  The  weight  trace  then  multiples the slope
          trace.  Default is last 3 traces.

     -s ist
          Enter the start time. No slopes  computed  before  this
          time (all zeroes). Default = start of trace.

     -e ied
          Enter the end time. No slopes computed after this  time
          (all zeroes). Default = end of trace.

     -ns nstr
          Enter the start trace number.  The default is the first
          trace of the record.

     -ne netr
          Enter the end trace number. The  default  is  the  last
          trace of the record.

     -rs nrst
          Enter start record number.  Default value is the  first
          record.

     -re nred
          Enter end record number.  Default value is last record.

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

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

BUGS

     Who knows; who cares

SEE ALSO

     ILIS

AUTHOR

     Nobody in his right mind would admit to coding this

COPYRIGHT

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