SUSYNLVCW - SYNthetic seismograms for Linear Velocity function
for mode Converted Waves
susynlvcw >outfile [optional parameters]
Optional Parameters:
nt=101 number of time samples
dt=0.04 time sampling interval (sec)
ft=0.0 first time (sec)
nxo=1 number of source-receiver offsets
dxo=0.05 offset sampling interval (km)
fxo=0.0 first offset (km, see notes below)
xo=fxo,fxo+dxo,... array of offsets (use only for non-uniform offsets)
nxm=101 number of midpoints (see notes below)
dxm=0.05 midpoint sampling interval (km)
fxm=0.0 first midpoint (km)
nxs=101 number of shotpoints (see notes below)
dxs=0.05 shotpoint sampling interval (km)
fxs=0.0 first shotpoint (km)
x0=0.0 distance x at which v00 is specified
z0=0.0 depth z at which v00 is specified
v00=2.0 velocity at x0,z0 (km/sec)
gamma=1.0 velocity ratio, upgoing/downgoing
dvdx=0.0 derivative of velocity with distance x (dv/dx)
dvdz=0.0 derivative of velocity with depth z (dv/dz)
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
er=0 =1 for exploding reflector amplitudes
ls=0 =1 for line source; default is point source
ob=1 =1 to include obliquity factors
sp=1 =1 to account for amplitude spreading
=0 for constant amplitudes throught out
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:
Offsets are signed - may be positive or negative. Receiver locations
are computed by adding the signed offset to the source location.
Specify either midpoint sampling or shotpoint sampling, but not both.
If neither is specified, the default is the midpoint sampling above.
More than one ref (reflector) may be specified. When obliquity factors
are included, then only the left side of each reflector (as the x,z
reflector coordinates are traversed) is reflecting. For example, if x
coordinates increase, then the top side of a reflector is reflecting.
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.
Note that gamma<1 implies P-SV mode conversion, gamma>1 implies SV-P,
and gamma=1 implies no mode conversion.
based on Dave Hale's code susynlv, but modified
by Mohammed Alfaraj to handle mode conversion
Date of modification: 01/07/92
Trace header fields set: trid, counit, ns, dt, delrt,
tracl. tracr, fldr, tracf,
cdp, cdpt, d2, f2, offset, sx, gx