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Mega quake in Nankai trough
April 4 , 2025
19 hrs 0 min
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- A "megaquake" and subsequent tsunami could cause as many as 298,000 deaths in Japan and damage costing up to $2 trillion.
- The Nankai Trough has a 70-80% probability of producing a magnitude 8–9 quake within the next 30 years.
- The Nankai Trough is a 900-kilometre undersea fault stretching from Shizuoka to Kyushu.
- Here, the Philippine Sea oceanic tectonic plate is "subducting" - or slowly slipping underneath the continental plate that Japan sits atop.
- Over the past 1,400 years, megaquakes in the Nankai Trough have struck every 100 to 200 years, with the most recent occurring in 1946.
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