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Manila Bulletin devider Philippines devider National devider Mayon Volcano in sustained effusive eruption, unrest reaches 91 days — Phivolcs

Mayon Volcano in sustained effusive eruption, unrest reaches 91 days — Phivolcs

Published Apr 7, 2026 02:48 pm
Screenshot from footage of short-lived lava fountaining at the summit crater of Mayon Volcano on April 7, 2026, at 8:39 a.m. and 9:23 a.m., producing ash clouds that rose about 300 meters before drifting west-northwest. (Phivolcs/Facebook)
Screenshot from footage of short-lived lava fountaining at the summit crater of Mayon Volcano on April 7, 2026, at 8:39 a.m. and 9:23 a.m., producing ash clouds that rose about 300 meters before drifting west-northwest. (Phivolcs/Facebook)
Continued volcanic activity at Mayon has reached 91 consecutive days, marked by a sustained effusive eruption with persistent lava flows, intermittent lava fountaining, and ash emissions, according to the Philippine Institute of Volcanology and Seismology (Phivolcs).
Short-lived lava fountaining events were recorded at 8:39 a.m. and 9:23 a.m. on April 7, producing ash clouds that rose about 300 meters before drifting west-northwest.
Phivolcs said the volcano remains in an effusive eruption phase, characterized by the steady outflow of lava that feeds established flow channels and triggers instability on the upper slopes.
Intermittent strombolian activity and short-lived lava fountaining were also observed during the 24-hour monitoring period from April 6 to April 7.
Strombolian activity refers to short, explosive bursts that eject glowing material and produce brief lava fountains.
Phivolcs also said that lava flows remain established in multiple channels, extending 3.8 kilometers along Basud Gully, 3.2 kilometers in Bonga Gully, and 1.3 kilometers in Mi-isi Gully.
During the same period, the agency recorded 308 rockfall events, 77 volcanic earthquakes, and four pyroclastic density currents, locally known as “uson.”
A faint crater glow was also observed, indicating continued magma movement beneath the summit.
Mayon remains under Alert Level 3, which indicates intensified magmatic unrest and the continued possibility of hazardous eruption scenarios.
Under this alert level, lava flows, rockfalls, and pyroclastic density currents may persist on the southern and eastern upper slopes, while moderate explosive activity and additional lava fountaining remain possible.
Phivolcs reiterated that entry into the six-kilometer permanent danger zone remains strictly prohibited due to life-threatening volcanic hazards.
Residents within the eight-kilometer radius were also advised to remain alert and prepare for possible evacuation should activity escalate further or if Alert Level 4 is raised.
Mayon has been under Alert Level 3 since January 6.

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MAYON PHIVOLCS ERUPTION EFFUSIVE LAVA
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