An earthquake with a preliminary magnitude of 7.6 struck north-central Japan today, public broadcaster NHK reported.

According to the AFP agency, citing the American Geophysical Institute (USGS), the earthquake had a magnitude of 7.4.

The Japan Meteorological Agency issued a tsunami warning along the western coastal areas of Ishikawa, Niigata and Toyama prefectures.

A tsunami of up to five meters is estimated to reach the South in Ishikawa Prefecture, according to the weather service.

Waves more than one meter high hit the coast of the city of Uajima in Ishikawa prefecture, NHK reported.

Hokuriku Electric Power announced that conducts inspections for any problems in nuclear power plantsNHK reported.