Overview

• The Tokyo Metropolitan Government released a three-minute generative-AI simulation to visualize how an eruption could affect the capital, marking its first use of the technology for disaster messaging.
• The scenario projects ash beginning to fall on Tokyo about one to two hours after an eruption, with roughly 2–10 centimeters of accumulation.
• The video warns that fine, jagged ash could halt trains and flights, clog machinery and drains, disrupt power and water systems, and pose health risks.
• Current guidance advises residents to stay home, stockpile about three days of supplies, and evacuate only if ash surpasses around 30 centimeters, especially near wooden buildings at risk of collapse.
• Officials say Mount Fuji shows no signs of an imminent eruption and remains under close monitoring, while some experts caution that a future eruption is possible after a long quiet period.