A moderate earthquake, measuring 4.7 on the Richter scale, hit northern Japan on Monday, but there were no immediate reports of injuries or damage.
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The quake happened at 9.21 am off the Pacific coast of Fukushima prefecture, some 200 kilometres northeast of Tokyo, the Japan Meteorological Agency said.
The quake was 80 kilometres deep, the agency said, adding that there was no risk of tsunami waves.
Japan, which lies at the junction of four tectonic plates, has about 20 per cent of the world's powerful earthquakes, frequently jolting Tokyo and other major cities.