|This serves as a notice for the lowering of Mayon Volcano’s status from Alert Level 4 (hazardous eruption imminent) to Alert Level 3 (decreased tendency towards hazardous eruption).|
PHIVOLCS: MAYON VOLCANO BULLETIN 14 March 2018 8:00 A.M.SUMMARY | Alert Level 3 currently prevails over Mayon Volcano.
Mayon’s activity in the past 24 hours was characterized by general quiescence, weak degassing from the summit crater and gravity-driven lava flow. Weak emission of bluish steam-laden plumes that rose to 700 meters before drifting southwest occurred intermittently throughout the day. Lava flows could be observed at night to be moving downslope on the Miisi,Bonga and Basud Gullies within 3.3 kilometers, 4.5 kilometers and 1.9 kilometers of the crater, respectively.
A total of twenty three (23) volcanic earthquakes and twenty five (25) rockfall events were recorded by Mayon's seismic monitoring network. Sulfur dioxide (SO2) emission was measured at an average of 458 tonnes/day on 13 March 2018. A Slight inflation of the lower flanks beginning 11 March 2018 was recorded by electronic tilt, consistent with results of Precise Leveling (PL) surveys on 03 - 06 March 2018. Overall ground deformation data indicate that the edifice is still swollen or inflated relative to pre-eruption baselines.