Snap shots of the pressure and internal energy. Here we show the pressure (a) and internal energy (b) with vertical distance z at time t of 0.52 s for one-dimensional propagation of a shock wave produced by an impact simulation with a velocity of υ_imp = 10 km s⁻¹ for a static basaltic cylindrical body at z ≤ 0 vertically colliding with another moving body at z = 0 at t = 0. Each green line shows simulation results and black lines correspond to the analytical solutions given by the Hugoniot relation. For z ≈ −6–0 km, the pressure and internal energy are increased by the shock wave, which should agree with the analytic solutions.