Mayon Volcano is showing serious signs of unrest again. State volcanologists have raised Alert Level 3 after dangerous pyroclastic density currents—locally called “uson”—were recorded in Albay.The upd ...
Alert Level 3 was raised over Mayon Volcano in Albay after pyroclastic density currents (PDC) or “uson” were recorded, the Philippine Institute of Volcanology and Seismology (PHIVOLCS) said Tuesday.