There have been several earthquakes in Japan overnight.
According to the US Geological Survey the first and strongest earthquake with a magnitude of 6.1 struck just before midnight local time off the east coast of Honshu, east of Sendai.
It was followed soon after by another 4.7 quake also east of Sendai – the city closest to the March 11 earthquake epicentre which triggered a tsunami.
A 4.5 magnitude earthquake was also recorded in the Izu Islands at 12.30am.
An hour and a half later a 5.3 earthquake was recorded to the west-north-west of Iwaki in Eastern Honshu.
The last quake recorded was at 3.30 am local time, east-southeast of Mito off the east coast of Honshu, with a magnitude of 5.1.
There have been no immediate reports of injuries or damage from the earthquakes and no tsunami warnings have been issued.