The Nuclear and Industrial Safety Agency says utilities should prepare for fault movements that take place 5 kilometers or more from the plants.
The agency says the fault that yielded the magnitude 7 earthquake that struck Fukushima Prefecture in April last year resulted in the movement of a fault that was thought to be inactive located about 50 kilometers from the Fukushima Daiichi nuclear power plant.
The agency added that the active fault could have been found earlier if drilling or other surveys had been conducted.
Source: NHK
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