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Whoever filmed this was very, very lucky that the flow stopped before reaching them, otherwise we wouldn't be watching this video. A pyroclastic flow is perhaps the most dangerous natural phenomenon and definitely the most dangerous volcanic one. When talking about volcanoes, people usually think of lava flows, but lava usually flows very slowly - if at all - and only under very rare circumstances (such as some Nyiragongo eruptions) there is not plenty of time to run away, even on foot. By contrast, a pyroclastic flow is almost the very definition of "overkill": insane amounts of scorching hot poisonous gases dragging clouds of ash and dust sometimes at the speed of a jetliner obliterating everything in its path with unstoppable fury. Even the most powerful hurricane looks tame in comparison. It was a pyroclastic flow that destroyed Pompeii and Herculanum, and later St. Pierre in Martinique, where over 30,000 people died in seconds.
A pyroclastic flow is a fast-moving current of hot gas and rock (collectively known as tephra), which reaches speeds moving away from a volcano of up to 700 km/h (450 mph).[2] The gas can reach temperatures of about 1,000 °C (1,830 °F). Pyroclastic flows normally hug the ground and travel downhill, or spread laterally under gravity. Their speed depends upon the density of the current, the volcanic output rate, and the gradient of the slope. They are a common and devastating result of certain explosive volcanic eruptions
A pyroclastic flow is a fast-moving current of hot gas and rock (collectively known as tephra), which reaches speeds moving away from a volcano of up to 700 km/h (450 mph).[2] The gas can reach temperatures of about 1,000 °C (1,830 °F). Pyroclastic flows normally hug the ground and travel downhill, or spread laterally under gravity. Their speed depends upon the density of the current, the volcanic output rate, and the gradient of the slope. They are a common and devastating result of certain explosive volcanic eruptions
