Tsunami advisories have been issued for Kochi, Miyazaki, Ehime, Oita, and Kagoshima prefectures, according to the Japan Meteorological Agency (JMA), Xinhua news agency reported.
The temblor occurred at 16:43 local time, measuring lower than 6 on the Japanese seismic intensity scale of 7 off Miyazaki Prefecture, said the JMA.
The magnitude was revised to 7.1 from 6.9 later.
No life loss or heavy destruction has been reported.