Mayon Volcano in Albay remained under Alert Level 3, indicating high levels of unrest, as state volcanologists recorded ongoing lava effusion, volcanic earthquakes, and elevated sulfur dioxide emissions in the past 24 hours, as of 5 a.m. Thursday.

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) said lava flows continued to advance through multiple gullies, reaching up to 3.8 kilometers in Basud, 3.2 kilometers in Bonga, and 1.8 kilometers in Mi-isi.

Monitoring data showed 10 volcanic earthquakes, including two tremor events lasting between two and four minutes. PHIVOLCS also logged 201 rockfall events and nine pyroclastic density current signals, indicating intermittent collapse activity and the movement of hot ash and gas down the slopes.

Sulfur dioxide emissions were measured at 1,562 tons per day on July 1, reflecting continued degassing from the volcano. A moderate plume rose about 600 meters above the crater and drifted toward the northeast, west-northwest, and west-southwest.

Ground deformation data indicated short-term deflation of the volcano’s edifice, though inflation has begun on the northeastern flank, suggesting ongoing magma movement beneath the surface.

Alert Level 3 means that magma is at or near the crater and that hazardous eruptions are possible within weeks or even days.

Authorities continue to warn the public against entering the six-kilometer permanent danger zone and advised communities to remain vigilant for sudden hazardous events such as lava flows, rockfalls, and pyroclastic density currents.