MAYON VOLCANO BULLETIN 28 December 2014 8:00 A.M. PDF Print

Mayon Volcano’s seismic monitoring network did not detect any volcanic earthquake during the past 24 hours. Emission of white steam plumes was of weak to moderate volume that crept downslope and drifted northwest and west-northwest. Crater glow was not observed last night due to rain clouds covering the summit. Sulfur dioxide (SO2) emitted at the crater averaged 259 tonnes/day on 09 December 2014, which is below the baseline level during normal periods. Ground deformation data from continuous tilt monitoring indicate that magma has stalled deep beneath the northern flanks of the edifice, although it is still inflated or swollen compared to baseline levels.

Mayon Volcano’s alert status has been lowered to Alert Level 2, which means that the likelihood of hazardous eruption within days to weeks has lessened. However, the lowering of the alert status should not be interpreted that the volcano’s unrest has ceased, considering that deeper beneath it eruptible magma has already accumulated. If there is a resurgence of volcanic unrest based on any one or combination of the above monitoring parameters, the alert status may step up to Alert Level 3 again. On the other hand, if there is a noticeable return to baseline levels of ground deformation and sustained low levels of other parameters, then the Alert Level may further step down. 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.