Mayon Volcano’s monitoring network recorded three (3) volcanic earthquakes and one (1) rockfall event during the 24-hour observation period. Faint crater glow from the summit could be observed at night. Sulfur dioxide (SO2) emission was last measured at an average of 143 tonnes/day on 10 October 2020. Ground deformation data from Precise Leveling surveys on 12–19 June 2020 indicated slight inflation of the edifice relative to the February 2020 survey. Continuous GPS data similarly indicated inflation of the lower to middle slopes since July 2019 to present. Electronic tilt also showed non-steady inflation from late 2019 to mid 2020 followed by a short term deflationary trend since July 2020.
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.