Electrical wires were seen swaying at a train station after a 6.3-magnitude earthquake struck off Japan's western prefecture of Ishikawa on Friday (May 5), Reuters reports.
Authorities said no tsunami warning was issued after the quake and the government has set up a disaster countermeasures office in a crisis management centre headed by the prime minister.
Japan's Chief Cabinet Secretary Hirokazu Matsuno said residents should continue to watch out for earthquakes with a seismic intensity at an upper-6 or higher on the Japanese intensity scale which runs to 7.
No abnormalities were reported at the Shika nuclear power plant located in Ishikawa prefecture, as well as at the Kashiwazaki-Kariwa plant in neighbouring prefecture of Niigata, Matsuno added.
