Video aired on NHK, shows multiple tsunami waves racing inland on March 11.

An hour and a half after the 9.0 quake, video was taken by helicopter, which flew from Sendai City south to Iwaki City.

The tsunami waves swallowed everything in their path. People in tall buildings can bee seen scrambling for the roof tops.

Professor Fumihiko Imamura at the Tohoku University Disaster Control Research Center, says he can see a tsunami rare effect, called undular bore, hit Natori City, Miyagi.

Undular Bore is a phenomenon in which a series of tsunami waves surge high near the shore and flood onto land one after another.  At least 20 undular bores hit the north east (Pacific) coast of Honshu.