A 7.1-magnitude earthquake has taken place off the eastern coast of Japan, but no tsunami warning has been issued, Japanese authorities have said. The quake on Saturday produced powerful shaking along parts of Japan’s eastern coast, and was felt strongly in Tokyo, but there were no immediate reports of casualties. Kyodo news agency reported that more than 50 people had been injured, but he gave no further details. Japan’s meteorological agency said the quake hit at 11.08pm local time (1408 GMT) at a depth of 60km (37 miles) in the Pacific, off Fukushima – near the epicentre of a 2011 killer quake that triggered a towering tsunami and killed more than 18,000 people. Saturday’s quake was followed by aftershocks, including a 4.7-magnitude jolt, JMA said. Local media reported power outages affecting hundreds of thousands of homes across the Tohoku region of eastern Japan. Fukushima nuclear plant operator Tepco said in a tweet it was checking on the status of the facility, which melted down after the 2011 tsunami. Local media reported the quake threw dishes from shelves in houses in the region, but there were no immediate reports of damage. Trains in the region were stopped after the quake. Yoshihide Suga, the prime minister, was called to his office, and broadcaster NHK said the government would set up a special liaison office to coordinate with affected regions. The US Geological Survey registered the quake as magnitude 7.0 at a depth of 54km. Japan sits on the Pacific “ring of fire”, an arc of intense seismic activity that stretches through south-east Asia and across the Pacific basin.