A powerful magnitude earthquake has hit off the northeastern coast of Japan, with officials warning tsunami waves of up to three metres could hit. Watch and follow live. Senior lecturer in oceanography at the University of Southampton Simon Boxall tells Sky News that today's earthquake is "in the same location" as the 2011 earthquake that killed more than 19,700 people and sparked a disaster at the Fukushima nuclear plant.
Speaking to presenter Jayne Secker, Boxall says that in the coming minutes and hours we'll find out just how damaging today's earthquake is. But he adds that "not all quakes create tsunamis".
The Japanese prime minister, Sanae Takaichi, has provided brief comments on the situation to reporters just a few moments ago.
She said the government set up an emergency task force to assess the extent of damage.
"We are putting people's lives first and doing everything we can," Takaichi said.
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