Mayon Volcano’s monitoring network recorded ten (10) volcanic earthquakes during the 24-hour observation period. Moderate emission of white steam-laden plumes that crept downslope before drifting to the general north was observed. Faint crater glow from the summit could be observed at night. Sulfur dioxide (SO2) emission was last measured at an average of 676 tonnes/day on 29 December 2020. Ground deformation data from Precise Leveling surveys on 28 November – 3 December 2020 indicated slight deflation of the edifice relative to the October 2020. Electronic tilt data also showed short-term deflation of the middle slopes since July 2020 after a period of non-steady inflation from late 2019 to mid-2020. Continuous GPS, however, recorded longer-term inflation of the lower to middle slopes since July 2019. Overall, the Mayon edifice is still inflated with respect to baseline parameters.

DOST-PHIVOLCS would like to remind the public that Mayon Volcano is at Alert Level 1, which means that it is at an abnormal condition. Although this means that presently no magmatic eruption is imminent, it is strongly advised that the public refrain from entering the 6-kilometer radius Permanent Danger Zone (PDZ) due to the perennial life-threatening dangers of rockfalls, landslides/avalanches at the middle to upper slope, sudden ash puffs and steam-driven or phreatic eruptions from the summit. Active stream/river channels and those identified as perennially lahar-prone areas on all sectors of the volcano should also be avoided especially during extreme weather conditions when there is heavy and prolonged rainfall. DOST-PHIVOLCS maintains its close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.

DOST-PHIVOLCS