CCTV shows power plant shaking. .
(Update) Japan earthquake: Eerie video captures tsunami arriving up river as huge evacuation alert issued.
This eerie footage captures a tsunami arriving in Japan after a 7.3 magnitude earthquake struck.
The powerful quake rocked the nation just before 6am local time on Tuesday, generating a tsunami that is set to hit the same region devastated by a nuclear disaster in 2011.
The tremor, which was felt in Tokyo, had a magnitude of 7.4 and was centred off the coast at a depth of about 6 miles.
A tsunami of up to 1.4 metres had been observed around Sendai, about 45 miles north of Fukushima.
(Update) Five injuries reported - tsunami warning removed.
The tsunami warnings have now been officially downgraded by Japanese authorities to advisories, which are less severe.
Five injuries have been reported so far.
Three people in Fukushima, one in Miyagi and one in Chiba - all were minor injuries.
A 7.4 magnitude earthquake shook Tokyo today after striking off the cost of Japan, as reported by mirror.co.uk
The Japan Meteorological Agency issued tsunami advisories for much of the nation's northern Pacific coast.
A warning read: "Damage due to tsunami waves is expected. Evacuate immediately from coastal regions and riverside areas to a safer place such as high ground or an evacuation building.
"Tsunami waves are expected to hit repeatedly. Do not leave safe ground until the warning is lifted."
Waves are expected to hit at least 3 metres high.
Japanese Minister for Disaster Management Jun Matsumoto told reporters about three hours after the quake that there had been no reports of significant injuries so far.
One woman suffered cuts to her head from falling dishes, according to fire department officials.
NHK showed footage of residents of Ishinomaki, a city badly hit in 2011, standing on a hill dressed in hats and heavy coats, staring down at the ocean.