An earthquake with a preliminary magnitude of 7.1 hit off the coast of eastern Japan on Saturday, the Japan Meteorological Agency said.
The epicentre of the earthquake was off the coast of Fukushima prefecture at a depth of 60 km (36 miles), the agency said, adding that a tsunami warning had not been issued.
The earthquake hit at 11:08 p.m. local time (1408 GMT) and shook buildings in the capital of Tokyo.