SUSYNLV - SYNthetic seismograms for Linear Velocity function 

 susynlv >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)               
 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          
 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.  


 Credits: CWP Dave Hale, 09/17/91,  Colorado School of Mines

 Trace header fields set: trid, counit, ns, dt, delrt,
                        tracl. tracr, fldr, tracf,
                        cdp, cdpt, d2, f2, offset, sx, gx