MANILA, Philippines — Mayon Volcano in Albay experienced a collapse of its southwestern slopes on Saturday, May 3, 2026, due to a lava dome collapse that generated a pyroclastic density current (PDC), state seismologists reported. The Philippine Institute of Volcanology and Seismology (Phivolcs) confirmed that the event occurred around 5:38 PM along Mi-isi Gully on the volcano's south-southwestern flank.

Details of the volcanic event

The PDC — a fast-moving cloud of hot ash, gas, and volcanic rock — raced down the slopes, carving through the Mi-isi drainage. Phivolcs noted that lava effusion from the new summit lava dome and subsequent lava collapse events characterized Mayon's activity in the 24 hours prior to the incident. Thick dark plumes engulfed the skies of Camalig and Guinobatan towns.

Seismic and rockfall data

In the past 24 hours before the collapse, state seismologists recorded 39 volcanic earthquakes, including 21 volcanic tremor events and 376 rockfall events from Mayon Volcano. These figures indicate elevated unrest, typical of a volcano in a state of heightened activity. Phivolcs continues to monitor the volcano around the clock.

Local government response

The Camalig Fire Station, together with residents, immediately launched cleanup operations in affected areas. No immediate evacuation orders were issued, but local disaster risk reduction offices remain on alert. The towns of Camalig and Guinobatan, both within the 6-kilometer permanent danger zone, reported ashfall and reduced visibility.

Phivolcs alert level status

As of the latest bulletin, Mayon Volcano remains under Alert Level 2, which indicates increasing unrest. Phivolcs reminds the public that entry into the 6-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited, as sudden steam-driven or phreatic eruptions, rockfalls, and landslides remain possible.

Significance for Filipino readers

This event underscores the persistent threat of Mayon Volcano to communities in Albay, home to over 1.4 million people. The collapse-fed PDC is a stark reminder that even without a major explosive eruption, lava dome instability can produce deadly, fast-moving hazards. For Filipinos, it highlights the importance of heeding Phivolcs warnings and maintaining disaster preparedness, especially for those living near active volcanoes. The swift response of local authorities and the cooperation of residents in cleanup efforts serve as a model for volcanic risk management.

Frequently Asked Questions

What caused the collapse of Mayon's slopes?

The collapse was triggered by a lava dome collapse that produced a pyroclastic density current (PDC). Lava effusion from the summit dome caused instability, leading to the collapse along the Mi-isi Gully.

What is a pyroclastic density current?

A PDC is a fast-moving mixture of hot gas, ash, and volcanic rock that flows down the slopes of a volcano. It can reach high speeds and temperatures, posing extreme danger to anyone in its path.

Is Mayon Volcano under alert?

Yes. Mayon remains under Alert Level 2, indicating increasing unrest. The public is advised to avoid the 6-kilometer Permanent Danger Zone and to stay updated with Phivolcs advisories.

What should residents in Albay do?

Residents should follow Phivolcs alerts, avoid the PDZ, monitor local government announcements, and prepare emergency kits and evacuation plans.