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Japan Issues First Ever 'Megaquake' Warning
After a 7.1 tremor struck southwestern Japan on Thursday, the country's meteorological agency issued its first-ever alert for a possible "megaquake." It marks the first time the warning has been issued under new rules drawn up after a 2011 earthquake, tsunami and nuclear disaster killed almost 20,00...
Phys.org reports: The JMA's "megaquake advisory" warns that "if a major earthquake were to occur in the future, strong shaking and large tsunamis would be generated." The advisory concerns the Nankai Trough "subduction zone" between two tectonic plates in the Pacific Ocean, where massive earthquakes have hit in the past. [...] Japan's government has previously said the next magnitude 8-9 megaquake along the Nankai Trough has a roughly 70 percent probability of striking within the next 30 years.
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