Japan's meteorological agency says it has now lifted a tsunami warning for the north-eastern coast after a 7.4-magnitude earthquake struck offshore.
The quake hit about 11.30 pm today Japan time. It has rattled nerves nearly a month after the devastating earthquake and tsunami that flattened the same area of coastline.
Announcers on Japan's public broadcaster NHK had told residents in the north-east to move to higher ground away from the shore.
The warning was for the same area devastated by last month's tsunami, which is believed to have killed some 25,000 people and has sparked an ongoing crisis at a nuclear power plant.
Officials at the Fukushima Dai-ichi nuclear plant say there was no immediate sign the aftershock caused new problems.
The latest quake occurred around 90 miles from Fukushima.
Earlier, a spokesman for plant operator Tokyo Electric Power Co. said workers at the Fukushima plant are safe but that it had evacuated two workers there and seven at a sister plant to the south that was not badly damaged.
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