Phivolcs notes increased Mayon seismic activity, warns of phreatic eruption

The Philippine Institute of Volcanology and Seismology (Phivolcs) recorded an increase in seismic activity at Mayon Volcano, indicating a possibility of a phreatic eruption.

Phivolcs noted 26 volcanic earthquakes since midnight on Saturday at depths of 5-10 kilometers beneath the northeast flank.

The volcano has also shown non-uniform inflation in its northeastern sector since October 2024 and in its south to southwestern sectors since March 2025, suggesting deep magma intrusion.

Sulfur dioxide emissions were measured at 609 tons per day on September 3.

Phivolcs has maintained Alert Level 1 for the volcano.

The public is advised to refrain from entering the 6-kilometer permanent danger zone due to potential rockfall, landslides, and short pyroclastic density currents.