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A 5.5-magnitude earthquake hit eastern Japan on Sunday, rocking buildings in Tokyo, seismologists said.
The quake struck at 7:37am, in Ibaraki prefecture, north of the capital, at a depth of 59 km, the US Geological Survey said.
The crippled Fukushima nuclear power plant was shaken by the quake but there were no abnormalities reported, the plant's operator said.
The quake lasted about 30 seconds and was felt by many people in Tokyo.
High-speed Shinkansen trains were stopped briefly for a track check, but quickly returned to normal operation.
More than 18,000 people died when a 9.0-magnitude sub-sea earthquake sent a towering tsunami barrelling into Japan's northeast coast in March 2011 in the country's worst post-World War II disaster.
Cooling systems at the Fukushima nuclear plant were knocked out, sending reactors into meltdown and forcing tens of thousands of people to flee.