I've seen about a dozen different videos of the tsunami in the past month, but had not previously encountered this one. It's a little bit different in that it's filmed from way inshore behind the city of South Sanriku, where the hills rise up above the town. This one also has full audio of the crunching sound of debris being ground by the wave, overlaid by the anguished voices of residents watching everything they own being destroyed. And at the end, there are views of late-departing town residents running for their lives - a stark reminder of how many must have been running around hopelessly in the center of town.
If you're going to watch, I would suggest clicking the fullscreen option button; the resolution is good enough for that feature on this video.