  Mini-jet production in ultra-relativistic nuclear collisions leads to initial
conditions characterized by large fluctuations of the local energy density (hot
spots) and of the collective flow field (turbulence). Assuming that local
equilibrium is reached on a small time scale, $\sim 0.5$ fm/c, the transverse
evolution of those initial conditions is computed using hydrodynamics. We find
that a new class of collective flow phenomena (hadronic volcanoes) could arise
under such conditions. This could be observable via enhanced azimuthal
fluctuations of the transverse energy flow, $d^2E_\perp/d\phi dy$.
