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I don't think that these junks can take the land!! I'm sure that when it start to enter to the atmosphere it will start to disintegrate and if not does, it will be detected by the radars and will be destroyed. But turn back to the questions and the answering it, I'm not sure of how will sound the falling space debris but maybe it will sound as when we throw a missile and we will hear it at kilometers of distance and if it touches the land, all the things near to it will be destroyed completely. Actually I don't know how I will react, but I suppose that the first thing that I will do is look which is it approximate trajectory that is following the object and then decide what I can do.