While Mount Etna frequently erupts, the defining event of Monday’s eruption was the more rare pyroclastic flow from the southwestern crater, not visible from a distance.

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

On Mount Semeru erupted four times. The first eruption occurred at 06:00 AM WIB, sending an ash column some 700 meters above ...

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.

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

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

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

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

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

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