Japan earthquake: 7.2 tremor shakes Tokyo buildings
An earthquake of 7.2 magnitude has struck off the coast of Japan, shaking buildings in the capital, Tokyo, and triggering a small tsunami.
The tremor was centred 168km (104 miles) from the east coast, north-east of Tokyo.
A 60cm (24in) tsunami reached the coastal town of Ofunato, with other towns reporting smaller waves shortly after the quake hit at 1145 (0245 GMT).
There are so far no reports of damage or injuries.
Japan is well-prepared for quakes which often hit the seismically active area.
An aftershock measuring 6.3 magnitude struck after the main quake, Japan's meteorological agency said, followed by a series of smaller aftershocks.
Some train services in the area were temporarily halted after the quake, but they were restarted shortly after noon.
Tohoku Electric Power said its Onagawa nuclear plant was operating normally after the quake and Tokyo Electric Power also said its power supplies were unaffected.