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Mount Fuji Volcanic Eruption Response Plan

Date: 2025.04.28

Japan has just announced a response plan in case of a volcanic ash eruption from Mount Fuji., divided into 4 levels:

Level 1: Ash < 3cm, transportation may be slightly affected.

Level 2: Ash 3-30cm, essential services can be restored. No evacuation required due to low risk.

Level 3: Ash 3-30cm but electricity and essential services cannot be immediately restored. Evacuation may be considered.

Level 4: Ash ≥ 30cm, evacuation recommended due to house collapse risk, especially during rainfall.

The committee also advises residents to stockpile food and drinking water. Currently, there are no predictions about the timing or scale of eruption.

Mount Fuji is 3,776m high, last erupted in 1707, with 4cm of ash covering the Tokyo area.

Mount Fuji Volcanic Eruption Response Plan: Alerts & Latest Information

Mount Fuji – the majestic symbol of Japan, renowned for its snow-capped peak throughout the year. However, hidden behind this beauty is a potential danger: Fuji remains a volcano silently active. According to the latest report from the Japanese government, if it suddenly awakens, the consequences could be extremely serious, even causing Tokyo to fall into a state of paralysis.

Impact of Volcanic Ash from Mount Fuji

A strong eruption could create massive ash volumes with severe impact on life and infrastructure. Experts warn:

・Over 30 cm of ash: High risk of house collapse, immediate evacuation required to avoid danger.

・10-30 cm: Residents should consider evacuation, depending on house structure and local conditions.

・3-10 cm: Severe transportation disruptions, people advised to limit outdoor movement.

・Under 3 cm: Lighter impact, but still requires monitoring of information for proactive response.

Risks to Tokyo Capital

Despite being 100 km away, a large eruption could deposit up to 10 cm of ash in the capital. Consequences include:

・Transportation paralysis: Ash obscures visibility and creates slippery conditions, causing difficulties for vehicles in motion.

・Supply chain disruptions: Goods transportation affected, leading to potential interruptions in the supply of food and essential items.

・Water pollution risk: Ash could clog water filtration systems, affecting city’s clean water supply.

Response Plan

To minimize risks, the Japanese government has developed preventive measures:

・Early warning system: Closely monitor volcanic activity signs for timely alerts.

・Evacuation plans: Preidentify safe zones and provide emergency movement guidelines.

・Essential supplies preparation: Encourage residents to stockpile food, water, and essential items for potential extended disruptions.

A Challenging Problem: Handling Hundreds of Millions of Tons of Ash

If a large eruption occurs, Japan could face a massive amount of volcanic ash up to 4.9 billion cubic meters – 10 times the waste generated from the 2011 Tohoku earthquake. Handling this enormous volume of ash presents numerous challenges, from recycling and burial to options of dumping it into the sea.

Early Warnings & Infrastructure Upgrades

To minimize damage, the Japan Meteorological Agency is considering adding ash fall warnings to disaster notification systems. According to the proposal, if ash is predicted to exceed 3 cm, local authorities will immediately implement transportation protection and maintain essential services.

Although Japan hasn’t experienced a major eruption in over 300 years, Mount Fuji remains an active volcano. Early preparation is essential to ensure safety. Government, businesses, and citizens must collaborate closely to address this risk before the “sacred mountain” truly awakens.

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