Tokyo visualizes "What if Mount Fuji erupts" using AI—realistically reproducing urban vulnerabilities such as difficulty returning home, power outages, and communication disruptions

On August 22, 2025, the Tokyo Metropolitan Government released an explanatory video for the first time, using "generative AI" to simulate the impact of volcanic ash on transportation, power, and communication in the Tokyo metropolitan area, in anticipation of a large-scale eruption of Mount Fuji. The video vividly illustrates issues such as widespread train suspensions, road closures leading to difficulties in returning home, power outages due to clogged intake filters in power distribution facilities and thermal power plants, and communication disruptions caused by ash accumulation and concentrated demand at base stations and data centers. It calls for regular preparedness, including securing masks, goggles, food, water, and information sources. Additionally, the Tokyo government launched the "Tokyo Mount Fuji Ashfall Special Site," which centralizes English information, action procedures, and cleaning and health measures. This aligns with the national **Wide-Area Ashfall Guidelines (March 2025)**, presenting a phased evacuation strategy from "stay-at-home" to "gradual evacuation" based on ashfall thresholds of "trace amounts/3cm or more/30cm or more." This article compiles practical action guidelines for foreign readers, whether residing in or visiting Japan, to avoid confusion "at that moment," based on the latest published materials and key points from the Tokyo government's AI video.