Solution
= Solution
S-wave <seismic impedance> is $Z_S=\rho V_S$. With $V_{S3}=3000\ \mathrm{m\,s^{-1}}$ as documented in part (i),
$$
\boxed{(Z_{S1},Z_{S2},Z_{S3})=(3.30,2.40,3.00)\times10^6\ \mathrm{kg\,m^{-2}\,s^{-1}}}.
$$
Unlike the P-wave case, the reservoir base has a nonzero S-wave <seismic impedance> contrast.