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Mayon Volcano’s seismic monitoring network recorded fifteen (15) volcanic earthquakes during the past 24 hours. Degassing at the active vent could not be observed due to thick clouds covering the summit. Precise leveling data obtained on September 16 to 21, 2017 indicated slight inflation of the edifice relative to May 2017 survey. Continuous GPS and tiltmeter measurements also indicate inflationary trend since July 2016. Sulfur dioxide (SO2) emission was measured at an average of 633 tonnes/day on November 03, 2017.

Alert Level 1 remains in effect over Mayon Volcano, which means that it is at 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.