Japan's meteorological agency has warned the chance of a megaquake striking near the Nankai Trough is higher than usual.
Japan has issued its first ever alert for a possible 'megaquake' hours after a magnitude 7.1 tremor struck. The country's meteorological agency said the chance of a major earthquake striking near the Nankai Trough is higher than usual, and estimated it could be as strong as magnitude 9.1.
What is the Nankai Trough? Japan - one of the world's most seismically active nations - has seen several tremors and tsunamis come from incidents in the Nankai Trough. The 560-mile subduction zone - where two tectonic plates collide and one is forced beneath the other - is off the southwest coast of the country, and runs from Shizuoka to the west of Tokyo over to the southern tip of Kyushu.
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