MAYON VOLCANO BULLETIN 21 June 2017 8:00 A.M. PDF Print

Mayon Volcano’s seismic monitoring network did not detect any volcanic earthquake during the past 24 hours. Weak to moderate emission of white steam plumes that crept downslope before drifting southwest, west-southwest and northwest was observed. Precise leveling data obtained on May 11 - 18, 2017 indicated inflation of the edifice relative to February 2017 survey. Tiltmeter measurements also indicate an inflationary trend since July 2016. However, results from continuous GPS measurements show short-term deflation of the edifice since January 2017. In general, the volcano remains inflated relative to 2010 baselines. Sulfur dioxide (SO2) emission was measured at an average of 456 tonnes/day on May 31, 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.