LOOK: Collapse of Mayon lava flow triggers fast-moving hot gas, debris

MANILA, Philippines — A lava flow collapse at Mayon Volcano in Albay generated a pyroclastic density current (PDC) on Tuesday morning, state volcanologists said. A PDC is a rapid, ground-hugging surge of intensely hot gas, ash, and volcanic debris that rushes down a volcano’s slopes during an eruption. According to the Philippine Institute of Volcanology and