Scientists think they’ve figured out how pyroclastic flows, fast-moving bringers of death during volcanic events, can travel such incredible distances and speeds despite the friction between the ...

Mixtures of hot volcanic rock and gas called pyroclastic flows travel so far by gliding on air, a new study suggests.

Pyroclastic density current (PDC): A turbulent, high-density flow composed of volcanic ash, lapilli and gases that descends rapidly along a volcano’s slope following an eruption.

Guatemala's Volcan de Fuego -- Volcano of Fire -- erupted spectacularly Sunday, shooting a plume of ash and gas nearly 6 miles into the sky and spreading ash and debris across towns and farms more ...

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Pressures within pyroclastic flows may be as much as three times as great as observations had suggested.

This river, or pyroclastic flow, may not be glowing orange like molten earth, but it is undeniably the most deadly part of the volcano.

Volcanologist Professor Chris Jackson discovers evidence of the deadly pyroclastic flow.

The image above shows the results of an avalanche of hot gases, ash, and rock known as a pyroclastic flow from Shiveluch volcano on the Kamchatka peninsula in Russia (from February 2011). When ...

Pyroclastic flow is full of rocks, ash and hot gas. It blasts across the ground at speeds over 50 mph and is incredibly hot — sometimes over 1,000 degrees Fahrenheit.