So far, there seem to have been 14 aftershocks of Magnitude 5.0 or greater (including the M8.2 one) but these mostly seem to have involved lateral movement of the earth's crust so there was never any real likelihood of a tsunami on the same scale as the 2004 one. That involved vertical movement of the crust which is why such a huge volume of water was displaced.
Still very worrying for everyone in the area, though.