The epicentre of the seismic activity was registered at a depth of 490 kilometers.
There is no information about victims or damage, and there is no tsunami threat.
Japan is located in a seismically active zone known as the Ring of Fire and regularly suffers from powerful earthquakes. In 2011, a 9.0-magnitude earthquake and the following tsunami killed over 15,000 people and caused the Fukushima nuclear plant disaster.