Alert Level 3 is still maintained in Mayon Volcano as its summit crater exhibits prolonged lava flow and its volcanic activity heightens, the Philippine Institute of Volcanology and Seismology (Phivolcs) said on Tuesday.

Based on Phivolcs' 24-hour monitoring, the lava flow has reached 2,500 kilometers along the Mi-isi Gully and 1,800 meters along the Bonga Gully.

The said lava flow caused debris to collapse within 3,300 meters of the Mayon Volcano’s crater.

The state seismologist’s Mayon Volcano Network also observed 301 rockfall events, 1 volcanic earthquake, and 2 dome-collapse pyroclastic density currents (PDC) with 2 to 3 minutes long.

Mayon Volcano also continuously emits steam-laden plumes that rose 800 meters before it drifted to the general west and 389 tonnes of sulfur dioxide since June 19.

“Alert Level 3 is maintained over Mayon Volcano, which means that it is currently in a relatively high level of unrest as magma is at the crater and hazardous eruption within weeks or even days is possible,” Phivolcs noted.

Interviewed during DZRH’s Damdaming Bayan, Phivolcs officer-in-charge Teresito Bacolcol warned that an explosive eruption of Mayon Volcano might still occur.

"Yung condition ng bulkan anytime may change and progress into an explosive eruption," Bacolcol said.