The earthquake struck at 14:46 on March 11, 2011. The seismograph on the floor of the basement of Fukushima Daiichi Nuclear Power Station’s containment building registered ground accelerations of up to 550 gals. Immediately afterward, online reactor Units 1, 2, and 3 went into emergency shutdown. Because the mammoth temblor toppled nearby transmission towers, the plant’s external electricity supply was cut off, prompting emergency diesel generators to start up automatically.
The earthquake struck at 14:46 on March 11, 2011. The seismograph on the floor of the basement of Fukushima Daiichi Nuclear Power Station’s containment building registered ground accelerations of up to 550 gals. Immediately afterward, online reactor Units 1, 2, and 3 went into emergency shutdown. Because the mammoth temblor toppled nearby transmission towers, the plant’s external electricity supply was cut off, prompting emergency diesel generators to start up automatically.