PHIVOLCS-DOST: Mayon Volcano update as of 18 March, 2018 - PH Trending

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Sunday, 18 March 2018

PHIVOLCS-DOST: Mayon Volcano update as of 18 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).

SUMMARY | Alert Level 3 currently prevails over Mayon Volcano.

PHIVOLCS: MAYON VOLCANO BULLETIN 18 March 2018 8:00 A.M.


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 voluminous emissions of white steam-laden plumes drifting southwest occurred 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 eighty-two (82) rockfall events were recorded by Mayon's seismic monitoring network. Sulfur dioxide (SO2) emission was measured at an average of 1,077 tonnes/day on 17 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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