A magnitude 7.6 earthquake has hit north-eastern Japan, with reports thousands have been ordered to evacuate their homes.
The quake occurred at 23:15 (14:15 GMT) at a depth of 50km (31 miles), about 80km off the coast of the Aomori region, the Japan Meteorological Agency said.
It prompted tsunami warnings which have now been lifted, while waves of 70cm (27in) were seen.
Japan’s Prime Minister Sanae Takaichi said at least seven people had been injured and warned residents to stay alert for new tremors for another week.
Addressing citizens affected by the earthquake, she said: “Reconfirm your daily earthquake preparedness, such as ensuring that you secure furniture, and prepare to evacuate immediately if you feel shaking.”
Orders were issued for about 90,000 residents to evacuate, according to Reuters news agency.
The government has set up a response office within the prime minister’s crisis management centre and convened an emergency team, chief cabinet secretary Minoru Kihara has said.
“We are making every effort to assess the damage and implement emergency disaster response measures, including rescue and relief operations,” he added.
Some bullet train services have been suspended along the north-eastern coast.
No irregularities were reported at the Higashidori and Onagawa nuclear power plants as a result of the quake, Tohoku Electric Power said.
None were detected either at the disabled Fukushima nuclear power station site, the Japanese authorities told the International Atomic Energy Agency.
Fukushima was damaged when a magnitude 9.0 quake struck off the country’s eastern coast on 11 March 2011.
That quake, the most powerful ever recorded in Japan, triggered a tsunami which swept over the main island of Honshu, killing more than 18,000 people and wiping entire towns off the map.
Japan is one of the world’s most earthquake-prone countries, with a tremor occurring at least every five minutes.
