Mayon Volcano recorded sustained high activity over a 24-hour period, with the Philippine Institute of Volcanology and Seismology (Phivolcs) recording dozens of pyroclastic density currents (PDCs) and hundreds of rockfall events while Alert Level 3 remains in effect.

From 12 a.m. on Jan. 18 to 12 a.m. on Jan. 19, Phivolcs logged 19 volcanic earthquakes, 297 rockfall events, and 57 PDCs, locally known as “uson.”

A fair crater glow was also observed and visible to the naked eye, indicating ongoing magma movement near the summit.

Sulfur dioxide emissions reached 3,788 tons on Jan. 19, reflecting continued degassing from the volcano, Phivolcs said.

The agency reiterated that entry into the six-kilometer-radius permanent danger zone is strictly prohibited, and warned against entering the extended danger zone without heightened vigilance.

Aircraft are likewise barred from flying close to the volcano due to the risk posed by ash and volcanic debris.

Phivolcs reminded the public and local government units that potential hazards while Alert Level 3 remains in effect include rockfalls, landslides or avalanches, ballistic fragments, lava flows and lava fountaining, pyroclastic density currents, moderate-sized explosions, and lahars during periods of heavy or prolonged rainfall.