The strong earthquake jolted about 160 km southwest of Makurazaki, Kagoshima, at 5:51 a.m. local time (20:51 GMT on Friday) at a depth of about 10 km, according to the Japan Meteorological Agency (JMA).

A 30-cm tsunami was observed on the Nakanoshima Island about an hour after the quake. A tsunami warning issued after the quake was lifted.

The Nuclear Regulation Authority said no abnormalities were detected at the Sendai nuclear power plant in Satsumasendai, Kagoshima.

The earthquake was reported as 6.7 on the Richter scale by the US Geological Survey.

The JMA said that aftershocks with the seismic intensity of 3 on the JMA scale might happen in the following week.

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