A strong 6.3-magnitude earthquake struck off Japan's southern Kyushu island on Friday, the US Geological Survey (USGS) reported, but no tsunami warning was issued.
The epicentre of the quake — which struck at 2:06am (1706 GMT Thursday) — was located 13 kilometres (eight miles) north of the city of Kunisaki-shi, USGS said.
The quake hit at a depth of 82 kilometres. There was no tsunami alert issued, Japan's Meteorological Agency said as cited by Kyodo News, nor any immediate news of fatalities or damage.
Japan's Meteorological Agency said there was no risk of a tsunami but urged residents to stay on alert.