This article explores the history of tsunamis in Japan, which has been prone to these destructive natural disasters due to its long coastline. It looks at some of the most devastating tsunamis, including the 2011 Tohoku earthquake and tsunami that killed 15,894 people, as well as other significant earthquakes in Japan. The article also discusses measures being taken by public authorities and private citizens to prepare for future tsunamis such as building sea walls, installing early warning systems and developing evacuation plans.