Philippines: Mayon Volcano Bulletin 23

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Three (3) volcanic earthquakes and twenty one (21) rockfall events related to the detachment of lava fragments at the volcano's upper slopes were detected by Mayon Volcano's (13.2576 N, 123.6856 E) seismic monitoring network during the past 24 hours. Steaming activity and crater glow were not observed due to thick clouds that covered the summit crater. Sulfur Dioxide (SO2) measurement was not conducted yesterday due to rain that occurred over the volcano area.

Alert Level 3 is in effect over Mayon, which means that the 6-km radius Permanent Danger Zone around the volcano and the 7-km Extended Danger Zone on the southeast flank of the volcano should be free from human activity because of sudden explosions that may generate hazardous volcanic flows. People residing close to these danger areas are also advised to observe precautions associated with post-eruption activity, such as rockfalls, pyroclastic flows, and ash fallout which can also occur anytime due to instabilities of lava deposited on steep slopes. Active river channels and those perennially identified as lahar prone in the southern sector should also be avoided especially during bad weather conditions or when there is heavy and prolonged rainfall. Civil aviation authorities must advise pilots to avoid flying close to the volcano's summit as ejected ash and volcanic fragments from sudden explosions may pose hazards to aircrafts. PHIVOLCS-DOST is closely monitoring Mayon Volcano's activity and any new significant development will be immediately posted to all concerned.