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The equilibration of matter and onset of hydrodynamics can be understood inthe AdS/CFT context as a gravitational collapse process, in which "collisiondebris" create a horizon. In this paper we consider the simplest geometrypossible, a flat shell (or membrane) falling in the holographic directiontoward the horizon. The metric is a combination of two well known solutions:thermal AdS above the shell and pure AdS below, while motion of the shell isgiven by the Israel junction condition. Furthermore, when the shell motion canbe considered slow, we were able to solve for two-point functions of allboundary stress tensor and found that an observer on the boundary sees a verypeculiar $quasiequilibrium$: while the average stress tensor $<T_{\mu\nu>}$contains the equilibrium plasma energy and pressure at all times, the spectraldensities of the correlators(related with occupation probabilities of themodes) reveal additional oscillating terms absent in equilibrium. This isexplained by the "echo" phenomenon, a partial return of the field coherence atcertain "echo" times.

Toward the AdS/CFT Gravity Dual for High Energy Collisions. 3.Gravitationally Collapsing Shell and Quasiequilibrium