Southern Japan jolted by 5.7 magnitude quake

Japan's southern Okinawa island and a chain of neighbouring islands were shaken on Monday by an earthquake with a preliminary magnitude of 5.7, but no tsunami warning was issued.

Japan Meteorological Agency said the quake occurred at 06:20 CET on Monday off the coast of Okinawa, at the depth of 40 kilometers below the sea surface.

The quake in the south came just minutes after another relatively strong temblor hit the north.

There were no immediate reports of damage or injury.

Earthquakes are common in Japan, one of the world's most seismically active areas.

Japan accounts for about 20% of the world's earthquakes of magnitude 6 or greater.