Japan Issues Megaquake Advisory Following 7.5 Magnitude Earthquake: Tsunami Risk and Preparedness Measures

Dec 10, 2025 03:38 pm CST

Japan has issued a megaquake advisory after a 7.5 magnitude earthquake struck off its eastern coast, warning of potential tsunami waves up to 98 feet high that could affect 182 municipalities. While officials state the probability of a magnitude 8+ earthquake is only 1%, they urge coastal residents to prepare emergency supplies for immediate evacuation. Government projections estimate a major offshore earthquake could cause 200,000 fatalities and $198 billion in damages.