Seismic ray parameter in horizontal layering
= Seismic ray parameter in horizontal layering
{title2=$p=\sin i/v=dT/dx$}
= Seismic ray parameter
{synonym}
In horizontally layered isotropic media, horizontal slowness is conserved along a ray. The incidence angle $i$ is measured from vertical. A smooth turning depth satisfies $pv=1$. The range and <travel time> are $x=2\int pv\,dz/\sqrt{1-p^2v^2}$ and $T=2\int dz/[v\sqrt{1-p^2v^2}]$ for a symmetric surface-to-surface turning ray.