SYNOPSIS

PERL PROGRAM NAME:

AUTHOR: Juan Lorenzo (Perl module only)

DATE:

DESCRIPTION:

Version:

USE

NOTES

Examples

SYNOPSIS

SEISMIC UNIX NOTES SUSYNVXZ - SYNthetic seismograms of common offset V(X,Z) media via

Kirchhoff-style modeling
susynvxz >outfile [optional parameters]
Required Parameters:
<vfile file containing velocities v[nx][nz]
nx= number of x samples (2nd dimension)
nz= number of z samples (1st dimension)
Optional Parameters:
nxb=nx band centered at midpoint
nxd=1 skipped number of midponits
dx=100 x sampling interval (m)
fx=0.0 first x sample
dz=100 z sampling interval (m)
nt=101 number of time samples
dt=0.04 time sampling interval (sec)
ft=0.0 first time (sec)
nxo=1 number of offsets
dxo=50 offset sampling interval (m)
fxo=0.0 first offset (m)
nxm=101 number of midpoints
dxm=50 midpoint sampling interval (m)
fxm=0.0 first midpoint (m)
fpeak=0.2/dt peak frequency of symmetric Ricker wavelet (Hz)
ref="1:1,2;4,2" reflector(s): "amplitude:x1,z1;x2,z2;x3,z3;...
smooth=0 =1 for smooth (piecewise cubic spline) reflectors
ls=0 =1 for line source; default is point source
tmin=10.0*dt minimum time of interest (sec)
ndpfz=5 number of diffractors per Fresnel zone
verbose=0 =1 to print some useful information
Notes:
This algorithm is based on formula (58) in Geo. Pros. 34, 686-703,
by N. Bleistein.
Offsets are signed - may be positive or negative. ",
Traveltime and amplitude are calculated by finite differences which
is done only in part of midpoints; in the skiped midpoint, interpolation
is used to calculate traveltime and amplitude. ",
More than one ref (reflector) may be specified.
Note that reflectors are encoded as quoted strings, with an optional
reflector amplitude: preceding the x,z coordinates of each reflector.
Default amplitude is 1.0 if amplitude: part of the string is omitted.
CWP: Zhenyue Liu, 07/20/92
Many subroutines borrowed from Dave Hale's program: SUSYNLV
Trace header fields set: trid, counit, ns, dt, delrt,
tracl. tracr,
cdp, cdpt, d2, f2, offset, sx, gx

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 dt

sub dx

sub dxm

sub dxo

sub dz

sub fpeak

sub ft

sub fx

sub fxm

sub fxo

sub ls

sub ndpfz

sub nt

sub nx

sub nxb

sub nxd

sub nxm

sub nxo

sub nz

sub ref

sub smooth

sub tmin

sub verbose

sub get_max_index

max index = number of input variables -1