PHIVOLCS: MAYON VOLCANO BULLETIN 24 March 2018 8:00 A.MSUMMARY | Alert Level 3 currently prevails over Mayon Volcano.
Mayon’s activity in the past 24 hours was characterized by relative quiescence on a background of intermittent lava collapse events. Two (2) episodes of lava-collapse pyroclastic density currents (PDC) on the Miisi Gully within 4-5 kilometers of the summit crater occurred at 10:39 AM and 9:33 PM yesterday generated light brown ash clouds that drifted southwest.
A total of thirty five (35) rockfall events were recorded by Mayon's seismic monitoring network. Sulfur dioxide (SO2) emission was measured at an average of 1532 tonnes/day on 22 March 2018. Slight inflation of the lower slopes that began on 11 March is still being recorded by electronic tiltmeter, consistent with results of Precise Leveling (PL) surveys on 10 - 19 March 2018. Overall ground deformation data indicate that the edifice is still swollen or inflated relative to pre-eruption baselines.