TOKYO - An earthquake with a preliminary magnitude of 6.7 rocked Japan's Hokkaido prefecture at 3:08 a.m. local time Thursday (1808 GMT Wednesday), Japan Meteorological Agency said.

The quake was centered in the Hokkaido prefecture, northern Japan, with the epicenter at a latitude of 42.7 degrees north and a longitude of 142.0 degrees east and at depth of 40 km.

The earthquake was logged 6 plus on the Japanese seismic intensity scale, which peaked at 7 in some areas of Hokkaido prefecture.

So far no major damage or injuries have been reported and no tsunami warning has been issued.