2, dxz
4,4,4,4, xmin_xtend,xmax_xtend,zmin_xtend,zmax_xtend
0,0.300, tmin,tmax
0, mu0
5,5,0,0, mu1_h,mu1_v,mu1_d,theta1
0,0,0,0,0, mu2_h,mu2_v,mu2_d,theta2,mu2_m
0,0,1, xwidth,zwidth,cwait
1, iop_vin
0,0,3000,5,45, xo_in,zo_in,vo_in,a_in,phi_in
1, iop_vref
0,0,2500,0,0, xo_ref,zo_ref,vo_ref,a_ref,phi_ref
0,0,0,0, iop_topo,z_topo,v_reduce,airspeed
2, iop_tout
0.000050,0.100, errlim,tcutoff
10,25, niter,itmax
Notes:
- dxz: Spatial grid interval (positive).
- xmin_xtend, xmax_xtend, zmin_xtend, zmax_xtend: Extension distances for slowness model edges (non-negative).
- tmin, tmax: Minimum and maximum observed traveltimes to use in inversion (non-negative).
- mu0: `Zeroth derivative' constraint weight (non-negative, 0=no regularization).
- mu1_h, mu1_v, mu1_d, theta1: Parameters defining first derivative constraints:
mu1_h: horizontal derivative weight (non-negative, 0=no regularization).
mu1_v: vertical derivative weight (non-negative, 0=no regularization).
mu1_d: directional derivative weight (non-negative, 0=no regularization).
theta1: angle of directional derivative (degrees, rel to horizontal).
- mu2_h, mu2_v, mu2_d, theta2, mu2_m: Parameters defining second derivative constraints:
mu2_h: horizontal derivative weight (non-negative, 0=no regularization).
mu2_v: vertical derivative weight (non-negative, 0=no regularization).
mu2_d: directional derivative weight (non-negative, 0=no regularization).
theta1: angle of directional derivative (degrees, rel to horizontal).
mu2_m: mixed derivative weight (non-negative, 0=no regularization).
- xwidth, zwidth: Horizontal and vertical dimensions of rectangular smoothing filter (0=no filter in coorinate direction). These values
are in model distance units (e.g. meters), not in number of grids!
cwait: Center weight of 'tent-shaped' distribution of filter weights (1.0=uniform weighting).
- iop_vin: Initial velocity model option flag (1=linear velocity formula, 2=read from external file).
- xo_in, zo_in, vo_in, a_in, phi_in: Linear velocity parameters for initial velocity model:
xo_in, zo_in: Horizontal and vertical coordinates of reference point.
vo_in: Velocity at reference point.
a_in: Magnitude of velocity gradient.
phi_in: Direction angle of velocity gradient (degrees, rel to horizontal).
- iop_vref: Reference velocity model option flag (0=initial model, 1=linear velocity formula, 2=read from external file).
- xo_ref, zo_ref, vo_ref, a_ref, phi_ref: Linear velocity parameters for reference velocity model:
xo_ref, zo_ref: Horizontal and vertical coordinates of reference point.
vo_ref: Velocity at reference point.
a_ref: Magnitude of velocity gradient.
phi_ref: Direction angle of velocity gradient (degrees, rel to horizontal).
- iop_topo: Topography option flag (0=ignore, 1=horizontal surface, 2=read surface topography from external file).
z_topo: z-coordinate of a horizontal plane surface (for iop_topo=1).
v_reduce: Velocity reduction factor above topographic surface (greater than 1.0).
airspeed: Speed of sound in air.
- iop_tout: Traveltime output option flag (0=none, 1=predicted traveltimes, 2=final traveltime resiudals).
- errlim, tcutoff: Parameters defining treatment of traveltime residuals:
errlim: Rms error limit for terminating tomographic iterations (non-negative).
tcutoff: Upper limit for including residuals in inversion (positive).
- niter, itmax: Iteration parameters:
niter: Maximum number of tomographic iterations (positive integer).
itmax: Number of LSQR iterations (positive integer).
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