NAME

FMeikonal - Fast marching eikonal solver


SYNOPSIS

FMeikonal < VelocityCube.H >TTCube.H pars


INPUT PARAMETERS

shotfile - sepfile
      file with multiple shots (n2 - number of shots, n1=3)
zshot,yshot,xshot - real
      [0., o2 + 0.5*(n2-1)*d2, o3 + 0.5*(n3-1)*d3 shot location
b1,b2,b3 - integer
      [1,1,1] constant-velocity box around the source
br1,br2,br3 - real
      [d1,d2,d3] constant-velocity box around the source
vel - integer
      [1]  velocity (1) or slowness (0)
vel0 - real
      velocity (or slowness) at the source [vel[0]]
order - integer
      [2]  first (1), second (2) or third (3) order


DESCRIPTION

Fast marching eikonal solver


SEE ALSO

the Hwt3d manpage, the fastmarch manpage, the Gfgradz manpage


COMMENTS

Be careful with sources outside the domain. You should smooth the velocity field if you want high-order accuracy. Stability problems *may* occur if traveltime accuracy is beyond machine precision. The program uses constant velocity ray-tracing inside an initial box, and until it detects a velocity variation, whichever is greater.


CATEGORY

seis/travel