'Megaquake' threat looms as Japan grapples with disaster readiness
The government then released a new estimate in March saying that such a megaquake and subsequent tsunami could cause as many as 298,000 death s and damages of up to $2 trillion. In 2014 the Central Disaster Management Council issued a preparedness plan recommending a series of measures that, it was hoped, would reduce deaths by 80 percent. But the government has said that so far the steps taken would only cut the toll by 20 percent, Kyodo news agency reported, and an updated preparedness plan was issued on Tuesday.
This recommended accelerated efforts including constructing embankments and evacuation buildings as well as more regular drills to improve public readiness. 'It is necessary for the nation, municipalities, companies and non-profits to come together and take measures in order to save as many lives as possible,' Prime Minister Shigeru Ishiba told a government meeting, local media reported.
The Nankai Trough is a 500-mile undersea gully running parallel to Japan's Pacific coast where one tectonic plate is 'subducting' - slowly slipping - underneath another. Over the past 1,400 years, megaquakes in the Nankai Trough have occurred every 100 to 200 years. The last one was in 1946. The Japan Meteorological Association (JMA) last August issued its first advisory warning that the likelihood had risen but it was lifted again after a week.
Some foreign tourists have been holding off coming to Japan this summer by unfounded fears spurred on social media that a major quake is imminent. Causing particular concern is a manga comic reissued in 2021 which predicted a major disaster on July 5, 2025. Hong Kong-based Greater Bay Airlines reduced flights to Japan because 'demand has rapidly decreased', a local tourism official told AFP in May.
'It is impossible with current science to predict earthquakes by specifying the location, time, and magnitude of an earthquake, and to say that an earthquake will or will not occur,' Ryoichi Nomura, head of the JMA, said in May. 'We ask the public to take certain steps so that you can cope with earthquakes no matter when they occur. But we also strongly urge the public not make irrational actions driven by anxiety.'
In 2011, a magnitude nine earthquake struck about 81 miles off the coast beneath the North Pacific. The earthquake produced waves up to 132ft tall in some places and killed 15,500 people. In addition, the flooding caused the meltdown of three nuclear reactors at the Fukushima power plant, releasing toxic waste into the environment and forcing thousands to flee their homes. However, a megaquake in Nankai Trench could be even more devastating than the 2011 Earthquake - the most powerful tremor in history.
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