The magnitude 6.6 quake was centered just off the western coast of the southwestern main island of Shikoku, in an area called the Bungo Channel, a strait separating Shikoku and the southern main island of Kyushu.
An earthquake with a preliminary magnitude of 6.4 hit southern Japan late on Wednesday, said the Japan Meteorological Agency, without issuing a tsunami warning.
An earthquake with a preliminary magnitude of 6.4 hit southern Japan late on Wednesday, said the Japan Meteorological Agency, without issuing a tsunami warning.