Following a major earthquake, a 15-metre tsunami disabled the power supply and cooling of three Fukushima Daiichi reactors, causing a nuclear accident on 11 March 2011. All three cores largely melted in the first three days. There have been no deaths or cases of radiation sickness from the nuclear accident, but over 100,000 people had to be evacuated from their homes to ensure this.
Nuclear power plants are designed to withstand earthquakes, and in the event of major earth movement, to shut down safely. In areas where the frequency and magnitude of earthquakes is significant, such as in Japan, particular attention is paid to seismic issues in the siting, design and construction of nuclear power plants.