PHIVOLCS-DOST: Mayon Volcano update as of 9 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 09 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 lava fountaining, lava flow and degassing from the summit crater.  Seven (7) lava fountaining events from 07:19 AM yesterday to 06:00 AM today, generated ash plumes that rose 300 meters above the summit crater before drifting southwest. These were accompanied by rumbling sounds audible beyond 10 kilometers of the summit crater. 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 one hundred eighty seven (187) volcanic earthquakes and thirty one (31) 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 slopes that began on 20 February is still being recorded by electronic tilt and by Precise Levelling (PL) surveys. Nonetheless, overall ground deformation data indicate that the edifice is still swollen or inflated relative to pre-eruption baselines.

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