SYNOPSIS
PERL PROGRAM NAME:
AUTHOR: Juan Lorenzo (Perl module only)
DATE:
DESCRIPTION:
Version:
USE
NOTES
Examples
SYNOPSIS
SEISMIC UNIX NOTES SUINVZCO3D - Seismic INVersion of Common Offset data with V(Z) velocity
function in 3D
suinvzco3d <infile >outfile [optional parameters]
Required Parameters:
vfile= file containing velocity array v[nz]
nz= number of z samples (1st dimension) in velocity
nxm= number of midpoints of input traces
ny= number of lines
Optional Parameters:
dt= or from header (dt) time sampling interval of input data
offs= or from header (offset) source-receiver offset
dxm= or from header (d2) sampling interval of midpoints
fxm=0 first midpoint in input trace
nxd=5 skipped number of midpoints (see note)
dx=50.0 x sampling interval of velocity
fx=0.0 first x sample of velocity
dz=50.0 z sampling interval of velocity
nxb=nx/2 band centered at midpoints (see note)
fxo=0.0 x-coordinate of first output trace
dxo=15.0 horizontal spacing of output trace
nxo=101 number of output traces ",
fyo=0.0 y-coordinate of first output trace
dyo=15.0 y-coordinate spacing of output trace
nyo=101 number of output traces in y-direction
fzo=0.0 z-coordinate of first point in output trace
dzo=15.0 vertical spacing of output trace
nzo=101 number of points in output trace ",
fmax=0.25/dt Maximum frequency set for operator antialiasing
ang=180 Maximum dip angle allowed in the image
verbose=1 =1 to print some useful information
Notes:
This algorithm is based on formula (50) in Geophysics Vol. 51,
1552-1558, by Cohen, J., Hagin, F., and Bleistein, N.
Traveltime and amplitude are calculated by ray tracing.
Interpolation is used to calculate traveltime and amplitude. ",
For each midpoint, traveltime and amplitude are calculated in the
horizontal range of (xm-nxb*dx, xm+nxb*dx). Velocity is changed by
linear interpolation in two upper trianglar corners whose width is
nxc*dx and height is nzc*dz. ",
Eikonal equation will fail to solve if there is a polar turned ray.
In this case, the program shows the related geometric information.
Offsets are signed - may be positive or negative. ", User's notes (Juan Lorenzo) untested
CHANGES and their DATES
Import packages
instantiation of packages
Encapsulated hash of private variables
sub Step
collects switches and assembles bash instructions by adding the program name
sub note
collects switches and assembles bash instructions by adding the program name
sub clear
sub ang
sub dt
sub dx
sub dxm
sub dxo
sub dyo
sub dz
sub dzo
sub fmax
sub fx
sub fxm
sub fxo
sub fyo
sub fzo
sub nxb
sub nxd
sub nxm
sub nxo
sub ny
sub nyo
sub nz
sub nzo
sub offs
sub verbose
sub vfile
sub get_max_index
max index = number of input variables -1