Raquel Monton, head of Greenpeace's anti-nuclear energy campaign, measuring radiactivity near the village of Itate. Radiation levels remains above levels permitted by the government following the 2011 Fukushima Daiichi nuclear disaster. On 11 March 2011 a magnitude 9 earthquake struck 130 km off the coast of Northern Japan causing a massive tsunami that swept across the coast of Northern Honshu damaging the Fukushima Daiichi nuclear power plant and triggering the worst nuclear accident since Chernobyl. The plant was shut down and a 20 km evacuation zone around the plant was declared by the government. Levels of radiation in the evacuation zone remain high.