JAPAN has released a terrifying AI-generated video showing residents what could happen if Mount Fuji erupted.

The footage, created by Tokyo's Metropolitan government, warned locals that their city could one day be buried under ash as it urged them to remain vigilant.

If Mount Fuji erupts, the ash is estimated to start pouring down on Tokyo within one to two hours, building a layer up to 10cm thick over the city.

Volcanic ash is formed during explosive eruptions when dissolved gases expand in magma and escape into the atmosphere.

The AI clip shows a huge grey cloud engulfing the sky as it mushrooms over the capital's high-rise buildings.

Thick black ash spreads over the city covering cars , houses and roads.

A voiceover over the clip says: "The moment may arrive without any war

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