(Corrects paragraph two to ...9:48 a.m. (0048 GMT) ..., not 9:57 (0057 GMT))

TOKYO, Dec 7 (Reuters) - An earthquake with a preliminary magnitude of 6 jolted a tiny island about 500 km (310 miles) south of Tokyo on Friday, a Japanese government agency said.

The quake, at 9:48 a.m. (0048 GMT), was felt in the capital and areas further north.

The epicentre of the tremor was near the island of Torishima and its depth about 50 km (30 miles), the Japan Meteorological Agency said on its Web site (http://www.jma.go.jp).

There were no immediate reports of injuries or damage and no tsunami warning was issued.

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