Great East Japan Earthquake and Fukushima accident

Conditions at the time

A major offshore earthquake in northeastern Japan led to a coastal tsunami and compound disaster.

How events unfolded

After a magnitude 9.0 earthquake at 14:46 on 3/11, the Fukushima nuclear plant lost power and cooling functions.

Stakeholders and impacts

Local residents, the plant operator, electricity users, and disaster and nuclear-safety institutions participated in the response.

Information available at the time

Contemporary nuclear-plant reports recorded tsunami flooding, emergency declarations and seawater injection.

Findings confirmed later

The earthquake, tsunami and nuclear accident were connected, but their damage and response pathways differed.

Alternative interpretations and limitations

Initial accident classifications and damage estimates may differ from later assessments. Economic loss amounts require separate material.

Source-based context and interpretation

Early reporting recorded loss of cooling and equipment failures that limited precise estimates. The IAEA's 2015 report separately examined accident development, safety, emergency response, radiological consequences and recovery. Initial provisional ratings were not final assessments of all long-term consequences. ASSETCASTING interpretation: Tsunami damage, electricity shortages, nuclear failure and evacuation connect but require different recovery measures. Restarting production does not complete community recovery. Quantified economic or health impacts require evidence addressing those specific outcomes.

Evidence coverage through 2015 · Sources checked 2026-10-14

• The core damage by loss of all cooling function due to the big tsunami ↗
• The Fukushima Daiichi Accident ↗

Related events and periods1

• Financial-crisis response and unconventional monetary policy →

  An event or period whose recorded start falls within this editorial interval. This does not establish that it caused or represents the characteristics of the era, nor guarantee that the entire period falls within the interval.