Tokyo: A 5.5-magnitude earthquake hit eastern Japan today, rocking buildings in Tokyo, seismologists said.
The quake struck at 7:37 am (2237 GMT Saturday), in Ibaraki prefecture, north of the capital, at a depth of 59 kilometres (37 miles), 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.