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 qu…READ FULL ARTICLE