A hazardous pyroclastic density current (PDC), locally known as “uson,” was observed early Monday morning at Mayon Volcano, as its ongoing eruption continued to generate dangerous volcanic activity, authorities said.

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) reported that sped-up camera footage captured lava effusion and a collapse-fed PDC from the summit crater between 6:31 a.m. and 6:46 a.m. on July 13, 2026.

A PDC is a fast-moving current of extremely hot ash, volcanic gas, and rock fragments, considered among the most dangerous volcanic hazards due to its speed and high temperature.

PHIVOLCS said Mayon’s effusive eruption has now reached its 189th consecutive day, producing incandescent lava flows, PDCs, and rockfalls.

Alert Level 3 remains in effect over the volcano, indicating a relatively high level of unrest. Authorities reiterated that entry into the 6-kilometer Permanent Danger Zone (PDZ) is strictly prohibited due to the risk of sudden explosions, lava flows, and PDCs.

Further details are expected as monitoring continues, PHIVOLCS said.