The Tohoku earthquake and subsequent tsunami (11th of March 2001) was one of the largest ever recorded and caused serious damage and loss of life in Japan.
You can see a quake map here.
The BBC have a good over view of events here
Wikipedia has a fact-filled page here
One of the most striking aspects of this incident was the way in which the Japanese people reacted. There was little in the way of looting and disorder, which can characterise the aftermath of disasters.