PHIVOLCS Update for Mayon Volcano, 28 January 2018. - PH Trending

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Sunday 28 January 2018

PHIVOLCS Update for Mayon Volcano, 28 January 2018.

ANNOUNCEMENT: Notice for the raising of Mayon Volcano’s status from Alert Level 3 (increased tendency to hazardous eruption) to Alert Level 4 (hazardous eruption imminent).
PUBLIC ADVISORY: Notice of raising Mayon Volcano’s status from Alert Level 3 to Alert Level 4 as of January 22, 2018.


PHIVOLCS has raised the alert level to Alert Level 4  in effect over Mayon Volcano. The public is strongly advised to be vigilant and desist from entering the eight (8) kilometer-radius danger zone, and to be additionally vigilant against pyroclastic density currents, lahars and sediment-laden stream flows along channels draining the edifice.


Between 06:22 PM yesterday to 01:40 AM this morning, two (2) episodes of sporadic lava fountaining from the summit crater lasting twenty-three (23) minutes and fifty-five (55) minutes occurred. The events fed lava flows on the Mi-isi and Bonga Gullies, sprayed near-vent lava spatter, and fed rockfall on the summit area. In between lava fountaining episodes, lava effusion continued to feed lava flows on the Bonga and Miisi Gullies. Heavy rainfall throughout the day generated sediment -laden streamflows in channels draining the volcano edifice.

A total of four (4) volcanic earthquakes, seven (7) tremor events, two (2) of which correspond to the lava fountaining events, twenty-three (23) rockfall events were recorded by Mayon's seismic monitoring network. Rockfall events were generated by the collapsing lava front and margins of the advancing lava flow on the Bonga and Miisi Gullies. Currently, the Miisi and Bonga lava flows have maintained their advance to three (3) and 1.8 kilometers, respectively, from the summit crater. 

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