The Fukushima Daiichi nuclear disaster was directly triggered by the 2011 Tōhoku earthquake and tsunami , when waves exceeded the height of the plant 's sea wall . Iwate Prefecture , which is an area at high risk from tsunami , had tsunami barriers walls ( Taro sea wall ) totalling long at coastal towns . The 2011 tsunami toppled more than 50 % of the walls and caused catastrophic damage
2011 Tōhoku earthquake and tsunami
2011 Tōhoku earthquake and tsunami
Tsunami