Pyroclastic passage zones record the lateral facies changes from a subaerial (pyroclastic flow, surge and fall deposits) to a subaqueous (turbidity currents, water-lain fall) depositional environment.

Pyroclastic flows contain a deadly combination of hot rock fragments and gas. Temperatures regularly top 1,000 degrees Fahrenheit, and these torrents can careen down mountainsides at hundreds of ...

Pyroclastic flows are a leading cause of eruption-related deaths. Now, lab tests reveal the mind-bending reason they may rush down a volcano’s flanks.

Pyroclastic flows are made up of a mix of hot lava, pumice, ash and volcanic gases. They can reach temperatures of up to 1,000 degrees Celsius and can—in extreme cases—move down the slopes of ...

BUFFALO, N.Y. — Thousands of years ago, at different points in time, clouds of ash, rock and hot gas rushed across the Mojave and Sonoran deserts as two volcanoes erupted. These destructive events are ...

Image: R. Simmon / NASA. Terra/MODIS image of potential pyroclastic flow deposits in the ocean west of Paluweh in Indonesia, taken February 2, 2013. Image: R. Simmon / NASA.

Pyroclastic flows can reach 1,300 degrees, the U.S. Geological Survey said. The flows can "destroy buildings and flatten forests," tweeted volcanologist Rebecca Williams of the University of Hull.

Pyroclastic flows are a mixture of hot gas along with volcanic matter, like ash and rock fragments, she said. They are incredibly hot and can travel faster than a moving vehicle in some cases.

Pyroclastic flows are searing-hot mixtures of volcanic material and gas that travel explosively down the slopes of volcanoes, sometimes traversing tens of miles at hundreds of miles per hour.

In Guatemala, pyroclastic flow from Sunday’s eruption topped 1,800 degrees Fahrenheit (about 1,000 degrees Celsius), CNN meteorologist Ivan Cabrera said.