Mach 3 shock is driven into a turbulent upstream density field. The initial pressure and density values for the shock tube correspond to those shown in Fig. 2. Panels: (i) gas pressure, (ii) gas density, (iii) dissipated-energy-weighted Mach number, (iv) the fraction of the gas speed in the x-component, (v) the x-component of gas velocity, (vi) gas speed divided by sound speed. Data are shown in slices except for (iii), which is a thin projection of 35 kpc. All values are shown in the shock rest frame at t = 180 Myr. Upstream density turbulence directly leads to shock corrugation, a distribution of Mach numbers at the shock front, and downstream velocity turbulence. An animated version of this figure can be found here.