Alert Level Bulletin

21 Agosto 2022

21 August 2022
4:00 PM

This serves as a notice of raising the status of Mayon Volcano from Alert Level 0 (Normal) to Alert Level 1 (Low-Level Unrest)


Since the Alert Level status of Mayon Volcano was lowered from Alert Level 1 to Alert Level 0 last 30 July 2021, monitored parameters have been generally unremarkable. However, daily visual and camera monitoring of the summit crater revealed that the remnant lava dome emplaced towards the end of the 2018 eruption has undergone a change in morphology and slight extrusion by approximately 40,000 m3 between 6 June and 20 August 2022. Ground deformation observations from Global Positioning Systems (GPS), precise leveling (PL), electronic tilt and electronic distance meter (EDM) monitoring have tracked a slight short-term inflation of the volcano edifice, particularly on the northwestern and southeastern slopes, since April 2022. In contrast, the latest measured SO2 emission on 12 August 2022 averaged 688 t/d, near baseline levels. Short-lived spikes in the number of low-frequency volcanic earthquakes were recorded on 26 May and 20 June 2022, but for most of this year, only baseline seismic activity has been detected. These observation parameters indicate that volcanic gas-induced pressurization at the shallow depths of the edifice may be occurring, causing the summit dome of Mayon to be pushed out.


In view of the above, PHIVOLCS-DOST is now raising the alert status of Mayon from Alert Level 0 to Alert Level 1.  This means that the volcano is exhibiting abnormal conditions and has entered a period of unrest. The public is reminded that entry into the 6-km Permanent Danger Zone or PDZ must be strictly avoided due to an increase in the chances of sudden steam-driven or phreatic eruption, as well as the perennial hazards of rockfalls, avalanches and ash bursts at the summit area, that may occur without warning. Furthermore, people living in valleys and active river channels are cautioned to remain vigilant against sediment-laden streamflows and lahars in the event of prolonged and heavy rainfall brought about by the advent of the rainy season. PHIVOLCS-DOST is closely monitoring Mayon Volcano’s activity and any new development will be immediately communicated to all concerned.