Mayon volcano. Photo courtesy of PNA.
Mayon Volcano remained under Alert Level 3 after renewed volcanic activity sent ash and debris across parts of the Bicol region, the Philippine Institute of Volcanology and Seismology said on Sunday.
In its latest 24-hour monitoring report, Phivolcs said its seismic network detected 32 volcanic earthquakes, including 25 tremor episodes that lasted from two to 15 minutes.
The agency also logged 284 rockfall events and 14 signals associated with pyroclastic density currents during the same monitoring period.
State volcanologists observed weak strombolian activity, intermittent lava fountaining, and several pyroclastic density currents within Mi-isi Gully, all occurring inside the Permanent Danger Zone.
Lava continued to move through several channels on the volcano’s slopes, reaching about 3.8 kilometers in Basud Gully, 3.2 kilometers in Bonga Gully, and 1.6 kilometers in Mi-isi Gully.
Ashfall was also reported in communities southwest of the volcano as emissions continued from the crater.
Phivolcs said a visible crater glow, locally known as “banaag,” remained apparent at night, while sulfur dioxide emission was measured at 1,586 tonnes per day based on the latest available reading.
Ground monitoring also showed slight inflation on the volcano’s northeastern sector, while gas plumes drifted toward the west-northwest and northwest.