Mayon Volcano lava effusion seen anew on 173rd day of effusive eruption

Mayon Volcano in Albay had lava effusion again late Friday evening and early Saturday, the Philippine Institute of Volcanology and Seismology (PHIVOLCS) said.

The PHIVOLCS Quick Response Team was able to record time-lapse videos of the lava effusion, which occurred from 9:41 p.m. to 11:19 p.m. Friday, and from 2:39 to 2:44 a.m. Saturday.

"Effusive eruption at Mayon Volcano continues for its 173rd consecutive day, generating incandescent lava flows, pyroclastic density currents (PDC) or 'uson', and rockfalls," PHIVOLCS said.

"Alert Level 3 prevails over Mayon, and entry into the 6-km Permanent Danger Zone must be prohibited," it added.

LOOK: Time-lapse footages of lava effusion from the Mayon Volcano summit crater recorded from 09:00 PM to 11:00 PM, yesterday, 26 June 2026 and 12:00 AM to 05:00 AM, today, 27 June 2026. Effusive eruption at Mayon Volcano continues for its 173rd consecutive day, generating… pic.twitter.com/bH38OsSUzw

— PHIVOLCS-DOST (@phivolcs_dost) June 27, 2026

At Alert Level 3, there is high level of volcanic unrest. Magmatic intrusion to shallow levels of the edifice is driving unrest, with indications that a hazardous eruption could occur in weeks. Danger zones may be expanded to a radius of 6 kilometers from the summit crater or active vent.

READ: EXPLAINER: Meaning of PHIVOLCS alert levels per active volcano

In its bulletin issued Saturday covering observation done from 12 a.m. Friday to 12 a.m. Saturday, PHIVOLCS said the lava flow reached 3.8 km on the volcano's Basud Gully, 3.2 km on Bonga Gully, and 1.8 km on the Mi-isi Gully.

There was also episodic minor Strombolian activity observed, PHIVOLCS said.

Thirty-four volcanic earthquakes were also recorded during the said period, with 13 volcanic tremors lasting 5 to 10 minutes.

A total of 222 rockfalls also occurred.

A crater glow could be seen with the naked eye.

Mayon Volcano also emitted 2,076 tonnes of sulfur dioxide on Friday.

Moderate plumes rose up to 1,000 meters above the crater before drifting northeast.

PHIVOLCS reiterated that flying aircraft close to the volcano should not be allowed.

It reminded the public that Mayon Volcano poses possible hazards such as the following:

• rockfalls or landslides or avalanches;
• ballistic fragments;
• lava flows and lava fountaining;
• pyroclastic density currents;
• moderate-sized explosions; and
• lahars during heavy and prolonged rainfall.

—KG, GMA News