A powerful earthquake has struck off Japan's southern coast, triggering a tsunami advisory.
The Japan Meteorological Agency said the quake registered a preliminary magnitude of 7.1 and was centred off the eastern coast of Japan's southern main island of Kyushu at a depth of about 30km.
It issued a tsunami advisory, predicting waves of up to one metre along the southern coast of Kyushu and the nearby island of Shikoku.
Operators of nuclear plants on Kyushu and Shikoku said they were checking to see if they had been damaged.
Japan's NHK public television said there were reports of broken windows at the Miyazaki airport near the epicentre.
Japan sits on the Pacific "Ring of Fire", the line of seismic faults encircling the Pacific Ocean, and is one of the world's most earthquake-prone countries.
An earthquake on January 1 in Japan's north-central region of Noto left more than 240 people dead.
This report first appeared via AAP. The story is developing and details may be updated.
