A strong earthquake registering a preliminary magnitude of 6.8 has struck off Japan’s northeastern coast, triggering a tsunami advisory.

Japan’s Meteorological Agency says the quake hit at 2.36 p.m. (0536 GMT) and was centred slightly south of where a massive magnitude 9.0 temblor struck on March 11. The agency issued a tsunami advisory, predicting waves of 50 centimetres along the coast of Miyagi and Fukushima prefectures, where nuclear reactors crippled in the March quake are located.

In Tokyo, buildings swayed only mildly.

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