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In page Timeline of the Fukushima nuclear accident:

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  • 14:46: A 9.0 magnitude earthquake strikes off the coast of Honshu Island at a depth of about 24 kilometres (15 mi). The Fukushima I power plant's nuclear reactors 1, 2, and 3 are automatically shut down by the tremor. Nuclear reactors 4, 5, and 6 were undergoing routine maintenance and were not operating (reactor 4 was defueled in November 2010). The tremor also cut the power plant off from the Japanese electricity grid; however, backup diesel generators kicked in to continue cooling. See extract from earthquake log below (the numbers e.g. D564, indicate the PID controller triggering the log event)[citation needed].
  • 14:46:46: 400 ms D564 Seismic (sensor) Trip