A 5.5-magnitude earthquake hit Japan's Fukushima area on Monday, but a nuclear plant there that was crippled by a huge quake and tsunami in March remained stable, officials said.
The offshore quake struck at 11:45 am (0245 GMT) beneath the Pacific off Fukushima prefecture in the country's north, at a depth of 30.2 kilometres (18.8 miles), the US Geological Survey said.