Mayon Volcano logs 133 rockfalls, 30 pyroclastic density currents, says PHIVOLCS

A total of 133 rockfall events and 30 pyroclastic density currents (PDC), locally known as “uson,” were recorded at Mayon Volcano in Albay over the past 24 hours, the Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported on Monday.

Lava dome formation and lava flow effusion were also observed during the same monitoring period, PHIVOLCS said. This indicates a slow extrusion of thick molten lava that accumulates near the crater before moving down the volcano’s slopes.