You can’t really grasp the scale of the tragedy of the Asia Tsunami of December 2004 without seeing satellite images of the disaster.
One striking example is the comparison between views of the same site before and after the tsunami in a gallery provided by Digital Globe.
Other sites show large scale wave patterns, swirling
receeding waves and even a
wave animation.
This should help remembering the scale of the event and give you one more reason to donate.