A small tsunami has reached the Pacific coast of northern Japan after a strong quake hit the region heavily damaged by the March earthquake and tsunami.
The Japan Meteorological Agency says a 10-centimetre tsunami was recorded at the port towns of Soma and Ofunato.
The agency issued a tsunami advisory for Iwate, Miyagi, and Fukushima prefectures after the 7-magnitude earthquake struck off the main island of Honshu.
No damage has been reported yet.
The US Geological Survey estimated the magnitude of the earthquake at 7.
It initially repoted the depth at nearly 35 kilometres but later revised that to 11km.
The quake was centred in the ocean 212km east of Sendai, which was destroyed by the 9-magnitude quake and tsunami in March.
Workers at the crippled Fukushima nuclear power plant were evacuated as a precaution after the tsunami alert was issued.
The plant was crippled by March's earthquake and tsunami, with three reactors suffering meltdowns.