PHIVOLCS-DOST: Mayon Volcano update as of 12 March, 2018 - PH Trending

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Monday, 12 March 2018

PHIVOLCS-DOST: Mayon Volcano update as of 12 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 12 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 at the active vent could not be observed due to thick clouds covering the summit. At night, lava flows were observed to continue moving downslope within 3.3 kilometers, 4.5 kilometers and 1.9 kilometers from the crater on the Miisi, Bonga and Basud Gullies, respectively.


A total of twenty-six (26) volcanic earthquakes and thirty-nine (39) rockfall events were recorded by Mayon's seismic monitoring network. Sulfur dioxide (SO2) emission was measured at an average of 2,060 tonnes/day on 08 March 2018. Deflation of the lower flanks that began on 20 February is still being recorded by electronic tilt, although a period of slight inflation of has been recorded by Precise Levelling (PL) surveys this past week. Overall ground deformation data indicate that the edifice is still swollen or inflated relative to pre-eruption baselines.


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