On Tuesday, a 6.8-magnitude earthquake struck off the coast of Hokkaido in northern Japan, but no tsunami warning was issued.
This is according to the Japan Meteorological Agency.
Japanese researchers urged authorities yesterday to prepare for a devastating "mega-earthquake" following a 7.1-magnitude quake on Thursday that left eight people injured in the south of the country.
Meanwhile, Japanese authorities today urged citizens not to rush to stockpile everyday goods amid growing concerns about a potential super-earthquake.
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