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There was an earthquake of magnitude 9.0. This is an extremely powerful earthquake, and I know of only one of greater magnitude that has been recorded.

The earthquake was followed by a tsunami. One of the tsunami waves that hit the Fukushima Daiichi plant was 14 meters (about 46 feet) tall. The seawall protecting the plant from tsunamis was only 5.7 meters tall, and this provided almost no protection. The equipment for the backup cooling system was swamped by seawater, and since the power from the electric grid was disrupted, no emergency backup could be established.

The International Atomic Energy Agency report on the accident puts the blame on a lack of foresight by the plant's owner and a lack of effective oversight by the government regulatory agency.

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Q: How did the fukushima disaster occur?
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