Fukushima Timeline By timelinemakingmaster Mar 11, 2011 9.0 Richter scale earthquake off east coast of Japan Mar 11, 2011 The earthquake triggered a 15 metre high tsunami Mar 11, 2011 The tsunami broke through the defensive sea wall and flooded the nuclear plant Mar 11, 2011 Three reactors overheated and a nuclear meltdown ensued Mar 25, 2011 Units 1-3 had been stabilised Dec 1, 2013 It was decided that none of the damaged reactors would ever be restarted