Past exam of the year 2 of the earth sciences (geology) course of the University of Oxford / 2023 / Paper 1 / 6 / l / Solution

P-wave seismic impedance is $Z_P=\rho V_P$. In layer order limestone, sandstone, salt,The salt's larger P-wave seismic velocity is exactly offset by its smaller printed density, so the second interface has no P-wave seismic impedance contrast in this stipulated model.