A large earthquake - reported to have a magnitude of 6.3 - has struck in Japan, according to reports.
The epicentre is south of Honshu, Japan's main island, experts from the United States Geological Survey (USGS) said.
It is not yet known if there were any injuries. It happened at around 3.30am local time.
People as far away as Tokyo reported feeling tremors.
One witness in the Japanese capital posted on the EMSC-CSEM website: "Bigger than usual. Tokyo has small ones from time to time but this one lasted longer and was bigger."
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Another said their bed moved as a result of the tremors.
And Dr Sarah Quinnell posted on Twitter: "Thank you twitter for confirming I’m not mad and that I was just woken up by an earthquake in Tokyo. If you’ve never experienced that it’s weird when the hotel starts swaying."
She added that the shaking had lasted for around 30 seconds, but it felt like longer.
According to USGS, the quake had a depth of 375.8km.
It is thought 30 million people live in the area which would have felt the quake.
