Ten Years after 311

Ten years have passed since the Great East Japan Earthquake and subsequent nuclear incident. What has changed and what hasn't changed in these past 10 years?

This map is a visualization of the results of radioactive material tests on food in Japan over 10 years. The rate of samples that exceed national standards is colored by city.

Keep in mind that the half-life of cesium137 in the environment is about 30 years. In the last 10 years, it has actually decreased by only about 20%

We need to keep monitoring this and ensure that updates are made public.

About the Work

This interactive map shows the rate of samples that exceed national standards (since April 2012) in color for each city in the Tohoku, Kanto, and Chubu region prefectures. Hokkaido, Kansai, Chugoku, Shikoku, and Kyushu / Okinawa were excluded because they exhibit almost no effect from radioactive substances. The excess rate is visualized monthly.

Note: In accordance with the guidance for levels of radioactive materials in Japan after April 1, 2012, we refer to the management value for drinking water as –10 (becquerel / kg), for milk as –50, for general food as –100, and for baby food as –50 in our analysis.
Reference DataThe data used in the work is an original analysis of the ``Levels of Radioactive Materials in Foods Tested in Respective Prefectures`` published by the Ministry of Health, Labor and Welfare below. As of March 2021, the data up to December 2020 have been released.
About the AuthorYasushi Noguchi is a Japanese artist who is involved in projects with the themes of collective memory and hidden social structures interpreted by using software, video, and other methods. In recent years, he has published many works on the theme of the Great East Japan Earthquake and subsequent nuclear incident. Currently, he is organizing the Software Design Laboratory, Department of Interactive Media, at Tokyo Polytechnic University.