An earthquake with a preliminary magnitude of 5.4 struck off Fukushima Prefecture early Sunday, but no tsunami warning was issued, the weather agency said.

The 6:17 a.m. quake registered 4 on the Japanese seismic intensity scale of 7 in towns including Futaba and Okuma, according to the Japan Meteorological Agency. The temblor's focus was off Fukushima at a depth of about 50 kilometers.

No abnormalities were detected at the Fukushima Daiichi and Fukushima Daini nuclear plants, according to their operator, Tokyo Electric Power Company Holdings Inc.

The latest temblor followed a magnitude-5.8 quake off Fukushima on Friday that registered lower 5 on the intensity scale.