TOKYO, Oct 5 (Reuters) - An earthquake with a preliminary magnitude of 6.4 jolted Japan's southern Okinawa islands on Monday, public broadcaster NHK said.
The quake, at 2228 local (1328 GMT), was at a very shallow depth, a government agency said.
A tsunami warning for waves of up to 50 cm was issued, according to NHK.
There were no immediate reports of injuries or damage. (Tokyo Newsroom +81-3 6441 1818) (If you have a query or comment on this story, send an email to news.feedback.asia@thomsonreuters.com)
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