Philippine Standard Time
 

00 volcano icon for bulletin  In the past 24-hour period, the Mayon Volcano Network recorded thirty-one (31) volcanic earthquakes including twenty-three (23) tremor events having a duration of one (1) to fifty-two (52) minutes, one (1) pyroclastic density current event, and eighty-seven (87) rockfall events. Short-lived gas bursts accompanied by seismic and infrasound signals also occurred at 06:36 PM 20 October 2023 and 12:06 AM 21 October 2023. Some of these tremors were accompanied by heaving sounds audible near the PDZ, as reported by nearby residents. The lava flows have maintained their advances to approximately 3.4 kilometers in Bonga (southeastern), 2.8 kilometers in Mi-isi (south), and 1.1 kilometers in Basud (eastern) Gullies. Rockfalls and PDCs generated by the collapse of the summit dome deposited debris still within four (4) kilometers of the crater. Volcanic sulfur dioxide (SO2) emission averaged 592 tonnes/day on 20 October 2023. Short-term observations from electronic tilt and GPS monitoring indicate inflation of the northwestern upper and middle slopes since late July 2023 and October 2023, respectively. Longer-term ground deformation parameters from EDM, precise leveling, continuous GPS, and electronic tilt monitoring indicate that Mayon is still generally inflated relative to baseline levels.

Alert Level 3 is maintained over Mayon Volcano, which means that it is currently in a relatively high level of unrest, and hazardous eruption within weeks or even days could still be possible. It is therefore recommended that the 6-km radius Permanent Danger Zone (PDZ) remain evacuated due to the danger of PDCs, lava flows, rockfalls, and other volcanic hazards. Increased vigilance against PDCs, lahars, and sediment-laden streamflows along channels draining the edifice is also advised. Heavy rainfall could generate channel-confined lahars and sediment-laden streamflows in channels where PDC deposits were emplaced. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden eruption can be hazardous to aircraft. Based on the current prevailing wind pattern, ash fall events may most likely occur on the south side of the volcano. DOST-PHIVOLCS maintains close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.


DOST-PHIVOLCS

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