PHIVOLCS-DOST: Mayon Volcano update as of 17 March, 2018

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 17 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, degassing from the summit crater and gravity-driven lava flow. Weak to moderate emissions of light brown to white steam-laden plumes that rose 1000 meters before drifting southwest and south-southwest occurred throughout the day. One (1) episode of lava-collapse pyroclastic density current (PDC) on the Miisi and Basud Gullies within 4-5 kilometers of the summit crater was visually observed at 1:47PM yesterday. A total of fifty-one (51) rockfall events were recorded by Mayon's seismic monitoring network. Sulfur dioxide (SO2) emission was measured at an average of 904 tonnes/day on 16 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.

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