The Tōhoku earthquake and tsunami occurred on 11 March 2011. It is sometimes referred to in Japan as the “Great East Japan Earthquake”. It was the most powerful earthquake ever recorded in Japan, and the fourth most powerful earthquake in the world since modern record-keeping began in 1900. The earthquake triggered powerful tsunami waves that may have reached heights of up to 40.5 meters (133 ft) in Miyako in Tōhoku’s Iwate Prefecture. The tsunami caused the Fukushima Daiichi nuclear disaster, which resulted primarily in the meltdowns of three of its reactors, the discharge of radioactive water in Fukushima and the associated evacuation zones affected hundreds of thousands of residents.
Source: https://www.discoverwalks.com/blog/tokyo/10-most-famous-historical-events-that-happened-in-japan/