The key measurement is the p-wave velocity $\begin{array}{l}V_p\end{array}$ and s-wave velocity $\begin{array}{l}V_s\end{array}$ .

The equivalent measurement is travel time: $\begin{array}{l}\tau_p = 1/V_p\end{array}$ and $\begin{array}{l}\tau_s = 1/V_s\end{array}$ .

Table 1. Typical values of wave velocities.

Media	P-wave velocity $\begin{array}{l}V_p\end{array}$ , m/s	S-wave velocity $\begin{array}{l}V_s\end{array}$ , m/s
Rocks	4500	2320
Casing	5860	7850
Weight cement	4000	2400
Conventional cement	2823	1920
Low-density cement	1960	1200
Ultra-low-density cement	1600	1100
Water	1500	1000

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