Story highlights There were no immediate reports of damage

Tokyo (CNN) A preliminary 6.2-magnitude earthquake struck Japan on Friday, according to the US Geological Survey.

The quake, which was 6.3 kilometers in depth, hit near Kurayoshi city to the west of Osaka, the USGS said.

Almost 80,000 households suffered from initial blackouts, but most power has been restored. A handful of light injuries were reported.

There have been reports of housing damage, with state media showing properties flattened by the temblor, but no tsunami warning has been issued.

No irregularities were reported from nuclear power plants in the region, authorities said.

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