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MAYON VOLCANO BULLETIN 20 February 2015 8:00 A.M.

Mayon Volcano’s seismic monitoring network detected one (1) volcanic earthquake during the past 24 hours.

Wispy emission of white steam plumes was observed. No crater glow was observed last night. Sulfur dioxide (SO2) emitted at the crater averaged 259 tonnes/day last 09 December 2014 is below the baseline level during normal periods. Data from the ground deformation survey on January 20-31, 2015 indicated a deflation of the edifice relative to the November 27-29, 2014 survey, although the edifice remains inflated relative to baseline measurements beginning 2010. Data from continuous tilt monitoring indicate that magma has stalled deep beneath the northern flanks of the volcano, although the edifice is still inflated or swollen compared to baseline levels.

Mayon Volcano’s alert status is currently at Alert Level 2. This means the volcano is at a moderate level of magmatic unrest. Although the volcano is currently exhibiting low-level of seismic activity, ground deformation data indicate that eruptible magma had already accumulated the previous year beneath the edifice. Current conditions may still change and eventually lead to hazardous eruption. The public is still reminded to avoid entry into the 6-km Permanent Danger Zone or PDZ due to perennial hazards of rockfalls, avalanche, ash puffs and sudden steam-driven or phreatic eruptions at the summit area. 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. PHIVOLCS-DOST is closely monitoring Mayon Volcano’s activity and any new development will be immediately posted to all concerned.


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