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

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

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 ...

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 ...

Italy’s Mount Etna volcano violently erupted on Monday, sending plumes of toxic ash and smoke billowing into the sky as people on the mountain ran for safety to escape the danger.

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