What is the Nankai Trough megaquake and why it could be fatal for Japan, according to Ryo Tatsuki’s prediction

Japan has approved a comprehensive disaster preparedness strategy to mitigate the impact of a potential Nankai Trough megaquake. Government projections warn of up to 298,000 deaths and widespread destruction. The plan, updating 2014 guidelines, aims to reduce fatalities by 80% and damage by 50% in ten years. It includes retrofitting homes, upgrading tsunami shelters, and enhancing early warning systems.