Mayon’s activity in the past 24 hours was characterized by generally quiet lava effusion, degassing from the summit crater and a brief, 200-meter tall lava fountain at 7:17 PM.  During daytime yesterday, between 5:49 AM and 5:03 PM, twenty-one (21) episodes of lava-collapse pyroclastic density currents (PDC) were visually observed on the Miisi, Basud and Bonga-Buyuan Gullies within 2-4 kilometers of the summit crater. At night, lava effusion from the vent continued to feed lava flows that have maintained fronts at 3.3 kilometers, 4.5 kilometers and 900 meters on the Miisi, Bonga and Basud Gullies, respectively, from the summit crater.

A total of seven (7) volcanic earthquakes and nineteen (19) rockfall events were recorded by Mayon's seismic monitoring network. Sulfur dioxide (SO2) emission was measured at an average of 1,459 tonnes/day on 22 February 2018. Electronic tilt and continuous GPS indicate that the edifice is still swollen or inflated relative to November and October 2017 due to pressurization by magmatic intrusion, consistent with campaign Precise Leveling data acquired this week.

Alert Level 4 still remains in effect over Mayon Volcano. The public is strongly advised to be vigilant and desist from entering the eight (8) kilometer-radius danger zone, and to be additionally vigilant against pyroclastic density currents, lahars and sediment-laden stream flows along channels draining the edifice. 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. DOST-PHIVOLCS maintains close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.