If Mount Spurr does erupt, it could produce explosive plumes of ash, destructive mudslides called lahars and avalanches of hot gas, ash and rock called pyroclastic flows, which would race down the ...

Authorities emphasized there was no danger to the population, and the pyroclastic flow — a fast-moving mixture of rock fragments, gas and ash — was limited to about 2 kilometers (more than a ...

It is a composite stratovolcano, made up of pyroclastic flows, lava flows, and debris from lahars that accumulated to form the volcanic cone.

A lava flow was spotted by satellites winding down the flanks of Mount Etna during an explosive outburst on June 2, which also released a large pyroclastic flow in the opposite direction. | Credit ...

But the defining event of Monday’s eruption was the more rare pyroclastic flow from the southwestern crater not visible from a distance.

A volcanic eruption in Italy left people scurrying for cover from what officials are saying is a pyroclastic flow. Several videos circulating online show people running as smoke from the side of ...

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

Mount Etna, the rambunctious volcano on the Italian island of Sicily, grumbled back to life on Monday, spewing hot ash and lava in a pyroclastic flow, the nation's volcano monitoring body said ...