emirates7 - Approximately 457 earthquakes have been detected near the Tokara Islands in southern Japan since June 25, according to the Japan Meteorological Agency.

Most of the seismic activity has been concentrated around Toshima Village and the nearby Amami Islands.

The quakes have varied in magnitude from 2 to 5, with epicenter depths ranging from 10 to 30 kilometers.

The most powerful tremor occurred Wednesday morning in the Tokara Islands, the agency reported.

There have been no tsunami alerts issued, and no injuries or property damage have been reported so far.