Japan issues first-ever warning for potential 'megaquake'

Authorities across Japan and Asia urge vigilance as the risk of a massive earthquake increases.

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Japan has issued its first-ever advisory warning people to remain cautious against a possible “megaquake”, following the recent 7.1 magnitude earthquake that shook the Miyazaki Prefecture, in the country’s south.

The Japan Meteorological Agency said the likelihood of a long-anticipated megaquake was greater than usual on the Nankai Trough off eastern Japan, and estimated that it could reach magnitudes of eight and even nine. A possible megaquake and tsunami disaster could kill hundreds of thousands of people and cause an estimated trillion-dollar damage to Japan.

The agency’s warnings, however, are not an indication of a guaranteed megaquake, but residents and visitors have been told to prepare and familiarise themselves with evacuation routes nonetheless. The most recent Nankai Trough quake happened in 1946 when a magnitude-8 tremor and 6.9-metre tsunami waves killed 1,330 people.

Japanese authorities have asked over two dozen prefectures to check their disaster preparedness.

Across the region, governments from South Korea to Hong Kong have warned their residents who are visiting or residing in Japan to stay alert.