Mayon Volcano remained under heightened unrest Friday, with continued lava effusion and increased seismic activity.

On Thursday night, July 2, between 7:04 p.m. and 7:46 p.m., photos taken by the PHIVOLCS Quick Response Team showed minor Strombolian activity and lava effusion from the summit crater.

In its 5 a.m. bulletin on Friday, PHIVOLCS reported ongoing lava flows descending through multiple gullies: up to 3.8 kilometers in Basud, 3.2 kilometers in Bonga and 1.8 kilometers in Mi-isi. Intermittent and weak Strombolian activity, characterized by short bursts of incandescent material, was also observed.

A total of 33 volcanic earthquakes were recorded over the past 24 hours, including eight volcanic tremors lasting between 18 and 26 minutes, along with 272 rockfall events, indicating continued instability in the edifice.

Sulfur dioxide emissions were measured at 2,091 tonnes per day on July 2, suggesting persistent degassing from the magma beneath the volcano. A moderate steam plume rose approximately 600 meters from the crater and drifted toward the southwest and west-northwest.

Ground deformation data showed a short-term deflation of the volcano, although initial signs of inflation were detected on its northeastern flank, indicating possible magma movement at shallow depths.

Authorities maintained that entry into the 6-kilometer-radius Permanent Danger Zone (PDZ) remains strictly prohibited due to the risk of sudden hazardous events. Aircraft are also advised to avoid flying close to the volcano.

PHIVOLCS warned of potential hazards, including rockfalls, landslides and avalanches, ballistic fragments, lava flows, pyroclastic density currents, moderate-sized explosions and lahars that may occur during periods of heavy and prolonged rainfall.