...data,

\begin{displaymath}
s_y=g_y\Leftrightarrow {k_m}_y=0 \end{displaymath}

\begin{displaymath}
k_z\equiv {k_z}_x\end{displaymath}

\begin{displaymath}
{k_z}_0\equiv {{k_z}_x}_0\end{displaymath}

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...Stolt (1996)

\begin{displaymath}
\v k_z= \sqrt{\v_0^2 {k_z}_0^2 +{k_m}_x\left(\v_0^2-\v^2\right)} \end{displaymath}

\begin{displaymath}
\omega= \sqrt{\omega_0^2+{k_m}_x\left(\v_0^2-\v^2\right)} \end{displaymath}

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Stanford Exploration Project
10/25/1999