Fukushima Nuclear Disaster
A tsunami triggered by the Tohoku earthquake caused three nuclear meltdowns at Fukushima
March 11, 2011
Earthquake, Tsunami, and Nuclear Crisis
On March 11, 2011, a magnitude 9.0 earthquake struck off the Pacific coast of Japan, triggering a massive tsunami with waves reaching up to 133 feet in some areas. The tsunami killed nearly 20,000 people and devastated entire coastal communities. It also knocked out power and backup generators at the Fukushima Daiichi nuclear power plant, operated by Tokyo Electric Power Company. Without power, the plant could not cool its reactors. Over the following days, three reactors experienced meltdowns, and hydrogen explosions blew apart the reactor buildings, releasing radioactive material into the air and ocean.
Evacuation and Contamination
Japanese authorities ordered the evacuation of more than 150,000 residents living within a 12-mile radius of the plant. Many of those people never returned to their homes. Radioactive water leaked into the Pacific Ocean, raising concerns about contamination of fish and marine life. Workers at the plant risked their lives to try to stabilize the damaged reactors. The disaster was rated at the highest severity level on the international nuclear event scale, placing it alongside the Chernobyl disaster of 1986. Japan shut down all of its nuclear power plants for safety reviews, causing energy shortages across the country.
A Long Cleanup Ahead
Cleaning up Fukushima Daiichi is expected to take decades. Engineers are still working to remove melted fuel from inside the damaged reactors, a process that has never been attempted before at this scale. Contaminated water has been stored in thousands of tanks on the plant site, and in 2023 Japan began releasing treated water into the ocean after removing most radioactive elements, a decision that sparked controversy with neighboring countries. The disaster renewed global debate about the safety of nuclear power and caused several countries to reconsider or phase out their nuclear programs. Japan itself has slowly restarted some reactors under stricter safety regulations.