Why in news?
Mayon Volcano in the Philippines produced further lava bursts and ash emissions after a moderately explosive eruption on 30 October 2026. In its 3 November report, the Philippine Information Agency said a morning event sent a plume about 1,600 metres above the summit crater. Mayon remained at Alert Level 3. Authorities maintained a six-kilometre-radius Permanent Danger Zone, and hundreds of families had moved to temporary shelters. The episode brings attention to the different ways an active volcano can affect nearby communities: falling ash, hot material moving down slopes and debris carried by heavy rain.
Where Mayon lies
Mayon stands in Albay province, in the Bicol region of southeastern Luzon. Luzon is the northern major island of the Philippine archipelago. The volcano rises about 2,462 metres above sea level and is known for its nearly symmetrical cone. Its summit, slopes and surrounding settlements form part of a landscape shaped by repeated volcanic activity.
The Philippines lies at the boundaries of the Philippine Sea and Eurasian plates. Along deep ocean trenches, plates descend beneath the archipelago. This downward movement of one plate beneath another is called subduction. The tectonic setting helps explain the country's many active volcanoes.
How a stratovolcano grows
Mayon is a stratovolcano, also called a composite volcano. Successive eruptions build layers of lava, ash and other volcanic material around a central system of passages. Molten rock below the surface is called magma. When it reaches the surface, it is called lava. Cooling lava and deposited fragments gradually add to the mountain's slopes.
Eruption behaviour depends partly on the magma's resistance to flow and the gases dissolved in it. As magma rises, pressure falls and gases can separate from the liquid. When gas escapes readily, lava can flow from a vent. If gas becomes trapped and pressure builds sufficiently, an explosion can break material into fragments and eject it into the air. This explains how one volcano can produce both lava flows and explosive activity.
Understanding the reported hazards
The 3 November government report described the morning activity as Strombolian, involving bursts of lava at the summit. It also reported light ashfall in parts of Albay. Volcanic ash consists of tiny fragments of rock, minerals and volcanic glass. Wind carries the suspended particles away from the crater before they settle. The direction of the wind therefore helps determine which communities receive ash.
A pyroclastic density current is a fast-moving mixture of hot gas and volcanic fragments that travels close to the ground. Such currents can develop when an eruption column collapses or unstable hot material falls from the summit. Their heat and speed make them dangerous on the slopes and along channels draining a volcano. Lava flows and rockfalls create additional hazards close to the mountain.
Heavy rain can also remobilise loose volcanic deposits. Water mixes with ash, soil and rock fragments to form a lahar, a volcanic debris flow. It can gain material as it moves down channels and river valleys. Rainfall can trigger these flows after fresh eruptive activity has ended, extending the period during which downstream settlements and infrastructure face danger.
Monitoring and the wider landscape
The Philippine Institute of Volcanology and Seismology, or PHIVOLCS, monitors the volcano and issues its alert information. The 3 November report listed volcanic earthquakes, rockfalls and gas emissions among the observations being tracked. The danger zone and restrictions on aircraft near Mayon link that monitoring with measures to reduce people's exposure to the reported hazards.
Mayon also lies within the Albay Biosphere Reserve, designated through UNESCO's programme in 2016. The reserve includes inland forests, agricultural land and coastal ecosystems such as mangroves and seagrass beds. Agriculture, fishing, crafts and tourism support livelihoods there. Volcanic risk management consequently involves a lived-in landscape with homes, farms, transport routes and valuable ecosystems.
Conclusion
Mayon's activity connects volcanic processes with practical decisions about evacuation, access and monitoring. Understanding ashfall, hot currents and rain-driven lahars helps explain why hazards vary across the surrounding landscape and over time.
Sources
- Philippine Information Agency: Mayon activity, Alert Level 3 and restrictions, 3 November 2026
- GDACS and Smithsonian Global Volcanism Program: Mayon location and volcano type
- US National Oceanic and Atmospheric Administration: stratovolcanoes, magma and explosive activity
- PHIVOLCS: volcanic processes and hazards
- US Geological Survey: volcanic ash composition and dispersal
- US National Park Service: pyroclastic density currents and how they form
- US Geological Survey: lahar formation and movement
- UNESCO: Albay Biosphere Reserve, designation, ecosystems and livelihoods