B747-400 Captain is informed after leaving the airport that while waiting for a gate his aircraft was damaged by another B747 when it was pushed back tail-to-tail with his.

Narrative

We were informed that our gate was occupied for 5 - 10 Minutes. International ramp asked us to hold in the vicinity of another gate. We would then taxi back and enter the ramp to go to our gate once a foreign air carrier clears after departing and adjacent gate. We stopped the aircraft adjacent to the gate and asked the ramp if there was enough clearance if we stopped here. Ramp told us it was OK and to hold at our present position. After foreign air carrier pushed back; we felt his jet blast as the aircraft powered away from us. We received clearance to our gate and parked. An hour later I got a call from the Duty Manager stating that my aircraft was involved in a ground accident. He stated that while we were parked the foreign air carrier plane was pushed back into our tail. This was the first I learned of the problem. There was no impact or movement of the control column noticed. No one in the cockpit mentioned a concern that the aircraft was hit. Everything seemed routine.