PHIVOLCS-DOST: Mayon Volcano update as of 13 March, 2018 - PH Trending

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Tuesday, 13 March 2018

PHIVOLCS-DOST: Mayon Volcano update as of 13 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 13 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 to moderate emission of light gray to white steam-laden plumes that rose to 100 meters before drifting southwest and west-northwest 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 twenty-six (26) volcanic earthquakes and fifty three (53) 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 was recorded by 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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