Overview

• Tokyo’s disaster office released a three‑minute AI video and the Cabinet Office posted a separate simulation to illustrate a hypothetical eruption and its urban impacts.
• Government modeling estimates about 1.7 billion cubic meters of ash could be produced, with roughly 490 million cubic meters settling on roads, buildings and land.
• Ash could reach central Tokyo within one to two hours depending on winds, disrupting transport, power, communications, water treatment and food distribution.
• Officials urge households to keep at least three days of food, water and medicines and to have masks and eye protection against fine volcanic ash.
• An expert panel outlined post‑eruption ash disposal options including use in construction, landfill storage or, as a last resort, dumping at sea, while some researchers criticized the warnings as alarmist.