Japan is on high alert as government officials warn of a looming megaquake that could cause catastrophic destruction, inflict economic losses amounting to $1.8 trillion, and claim the lives of nearly 300,000 people.

The long-feared seismic event, expected to originate from the Nankai Trough along the Pacific coast, has an 80% probability of occurring within the next few decades, according to a new government report released on Monday.

Economic devastation and human toll

The latest projections from Japan’s Cabinet Office highlight the potential for severe economic damage, estimated at 270.3 trillion yen—nearly half of the country’s total gross domestic product (GDP). This div marks a significant increase from the previous estimate of 214.2 trillion yen, reflecting adjustments for inflation and updated terrain data that expand the anticipated flood zones.

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Under the worst-case scenario of a magnitude 9 earthquake striking the Nankai Trough, Japan could witness mass evacuations exceeding 1.23 million people, with an estimated death toll of 300,000. Most casualties would result from tsunamis and collapsing buildings, particularly if the quake were to hit late at night during winter.

A volatile seismic region

Japan, one of the most earthquake-prone nations in the world, lies at the convergence of multiple tectonic plates, making it especially vulnerable to large-scale seismic activity. The Nankai Trough, a 900-kilometer-long (600-mile) subduction zone where the Philippine Sea Plate is gradually sinking beneath the Eurasian Plate, has historically produced massive quakes every 100 to 150 years due to the accumulation of tectonic stress.

Megaquake: Rising concerns after historic disasters

The latest warning follows Japan’s first-ever megaquake advisory last year, in which the government cautioned that a magnitude 9 earthquake had a “relatively higher chance” of occurring within the trough. This advisory was issued after a magnitude 7.1 earthquake struck the periphery of the Nankai Trough, raising fears of an impending larger event.

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Memories of the devastating 2011 Tohoku earthquake remain fresh in the country’s consciousness. The magnitude 9 tremor unleashed a massive tsunami that ravaged coastal regions, caused triple reactor meltdowns at the Fukushima Daiichi nuclear power plant, and resulted in over 15,000 deaths. Japan has since ramped up its disaster preparedness, but officials warn that the scale of a future Nankai Trough quake could be even more devastating.

Government’s response and preparedness measures

Japanese authorities have intensified efforts to mitigate the potential impact of such a disaster. Measures include strengthening building codes, expanding tsunami early-warning systems, and increasing public awareness campaigns to prepare citizens for emergencies. The government is also working on reinforcing critical infrastructure, including nuclear plants and transportation networks, to withstand seismic shocks.

As Japan remains on edge, scientists continue to monitor tectonic activity in the region, emphasizing the need for vigilance and comprehensive disaster preparedness to prevent another national catastrophe.

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