The tremor was centred in the waters near Iriomote Island, southwestern Japan, with the epicentre at a latitude of 24.2 degrees north and a longitude of 123.8 degrees east and at a depth of 20 km, Xinhua news agency reported.
The earthquake logged lower 5 in some parts of Okinawa prefecture on the Japanese seismic intensity scale which peaks at 7.
No major damage or injuries were reported and no tsunami warning was issued.
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