Japan issues megaquake warning after 7.5 magnitude earthquake
Japan’s Meteorological Agency issued a megaquake advisory on December 9, 2025, following a magnitude 7.5 earthquake that struck off the coast of Aomori Prefecture in northern Japan on December 8.
The quake, initially reported as 7.6 but later revised to 7.5 with a depth of 54 km, caused strong shaking across Hokkaido and Tohoku regions, injuring around 30-34 people mostly from falls or falling objects, and prompting temporary evacuations of about 90,000 residents. Tsunami warnings were issued for up to 3 meters but lifted hours later after waves measured only 20-70 cm, with no major structural damage beyond some roads and buildings.
The advisory covers an 800-mile Pacific coastline from Hokkaido to Chiba east of Tokyo, warning of a heightened 1% chance of a magnitude 8+ quake or massive tsunami (up to 98 feet) in the next week due to activity in the Japan and Chishima Trenches. Officials urged coastal residents to prepare evacuation plans and stay vigilant, referencing risks similar to the 2011 disaster that killed nearly 20,000.
Prime Minister Sanae Takaichi noted minor injuries and one fire, while rail services faced suspensions and delays; the advisory aims to boost preparedness without mandating evacuations.
