Japan is located in a seismically active zone known as the Ring of Fire and regularly suffers from powerful earthquakes. The 2011 9.0-magnitude earthquake and subsequent tsunami killed over 15,000 people and caused the Fukushima nuclear plant disaster.
A 6.4-magnitude tremor hit off southeast of Japan, the United States Geological Survey (USGS) reported Tuesday. The epicentre of the quake was located 116 km south southeast of Kyushu Island at a depth of 39 km.
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