A total of 207 rockfall events and 27 pyroclastic density currents (PDCs) were recorded at Mayon Volcano in Albay over the past 24 hours as it remained under Alert Level 3, the Philippine Institute of Volcanology and Seismology (Phivolcs) said on Thursday.

In its latest monitoring bulletin, Phivolcs said the activity was linked to the continued growth of the lava dome and ongoing lava flow at the volcano’s summit.

Crater glow was also observed, indicating that hot magma remains close to the surface.

Sulfur dioxide emission was measured at an average of 987 tons per day, reflecting sustained degassing from the volcano. Volcanic plumes rose as high as 800 meters above the crater before drifting toward the west-southwest and southwest directions.

Despite the surface activity, Phivolcs noted that no volcanic earthquakes were recorded during the monitoring period. Ground deformation data, however, showed that Mayon remains inflated, suggesting persistent magmatic activity beneath the volcano.

Phivolcs said that the volcano is still currently under Alert Level 3, which signifies intensified or magmatic unrest.

With this, Phivolcs reiterated that entry into the six-kilometer Permanent Danger Zone (PDZ) is strictly prohibited, including areas within the Extended Danger Zone (EDZ), flying close to the summit due to possible ash emissions and sudden explosive activity.

Residents were advised to stay alert for possible volcanic hazards such as rockfalls, lava flows, PDCs, moderate ashfall, and lahar flows, especially during periods of heavy rainfall.