Japan’s meteorological agency said on Thursday that there was a higher-than-usual chance that an immense earthquake could hit the country in the next few days, following a 7.1-magnitude temblor off the southern island of Kyushu.

       Japan has long expected a major earthquake to occur along the Nankai Trough off its eastern coast. As of last year, researchers said there was a 60 percent chance that an earthquake of magnitude 8 to 9 — even more devastating than the one in 2011 that laid waste to the country’s northeast coast and knocked out cooling systems at the Fukushima Daiichi nuclear plant — would occur in the trough area over the next 20 years.

       After the 7.1-magnitude quake on Thursday, Japan’s meteorological agency convened a group of experts to evaluate whether it could be related to the long-anticipated bigger disaster, called a “Nankai Trough megathrust earthquake.”

       Experts warn that an earthquake between two tectonic plates that converge along the Nankai megathrust fault, which runs from Kyushu north through Tokyo, could cause devastation. It could extensively damage cities throughout Japan, potentially cause a tsunami and lead to hundreds of thousands of deaths.

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       “The possibility of a large-scale earthquake occurring in the area of ？？the Nankai Trough is relatively higher than usual,” the meteorological agency said in a statement late Thursday.

       The risk that an earthquake of magnitude of 8 or higher would occur after one with a magnitude of 7 is particularly elevated for about a week after the initial temblor, the agency said.

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