# Dictionary:T-ΔT analysis

Normal moveout ( ${\displaystyle \Delta t}$ ) as a function of offset (${\displaystyle x}$) and arrival time (${\displaystyle t}$) that can be used to yield stacking velocity (${\displaystyle V_{s}}$):
${\displaystyle V_{s}={\frac {x}{\sqrt {2t\Delta t}}}}$