The following are events related to the crisis at Tokyo Electric Power Co.'s six-reactor Fukushima No. 1 nuclear plant, triggered by the March 11, 2011, megaquake and tsunami.
March 11, 2011 — Magnitude 9.0 earthquake and tsunami cripple plant, cutting off power to the entire site. Government declares nuclear emergency, directing residents in a 3-km radius of the plant to evacuate.
March 12 — Prime Minister Naoto Kan inspects the plant. Hydrogen explosion occurs at reactor 1 building. Government expands evac zone to 10-km radius.