If Mount Fuji were to erupt...
Large amounts of volcanic ash may fall in Tokyo.
Understand the impacts of ashfall and prepare for it.
Distribution of ash fall
The Central Disaster Prevention Council’s Working Group on Wide-area Ashfall Countermeasures in the Event of a Large-Scale Eruption published a report titled “Wide-area Ashfall Countermeasures in the Event of a Large-Scale Eruption – Impacts of Ashfall and Countermeasures in the Tokyo Metropolitan Area – Using the Eruption of Mt. Fuji as a Model Case” in April 2020.
Source: Regarding wide-area ashfall countermeasures in the event of a large-scale eruption – Impacts of ashfall and countermeasures in the Tokyo metropolitan area – Using the eruption of Mt. Fuji as a model case (report) [Attached materials]
Model case in which the impact on Tokyo is greatest
- Ashfall of 2 to 10 cm or more occurred in most wards, including the Tama area.
- The amount of volcanic ash that needs to be removed within Tokyo is approximately 120 million m3.
- The total amount of volcanic ash that needs to be removed is estimated at about 4.9 billion m3, more than 10 times the amount of disaster waste generated by the Great East Japan Earthquake.
*This assumption is merely an example for consideration and does not predict the state of a future eruption of Mt. Fuji. It is important to understand that in the event of an actual eruption, the ash fall situation will change depending on factors such as wind direction, the scale and duration of the eruption.
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What are the effects of ashfall?
Ashfall from volcanic eruptions has various effects on transportation infrastructure, lifelines, health, etc. We will introduce the main damage caused by ashfall and its effects.
How can you prepare for ashfall?
Advance preparation and appropriate responses are essential to minimize the effects of volcanic ashfall. Here are some measures you can take to protect yourself from damage caused by volcanic ash.
Learn about the eruption of Mount Fuji
We will introduce the history and characteristics of Mount Fuji’s eruptions, which have occurred many times in the past.
Volcanic disaster prevention information
We will introduce basic information about volcanoes, such as the properties of volcanic ash and disaster prevention information regarding volcanoes.
Resources and Related Links
For those who would like more information about volcanic eruptions and ashfall, we have compiled a list of relevant materials and external links.
Learn and discover through videos
“What will happen to Tokyo if Mt. Fuji erupts?” and “What measures should we take?”
are some of the questions we answer in an easy-to-understand manner using video generated by generative AI.
