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| PUBLIC ADVISORY: Notice of raising Mayon Volcano’s status from Alert Level 3 to Alert Level 4 as of January 22, 2018. |
PHIVOLCS: MAYON VOLCANO BULLETIN 01 March 2018 8:00 A.M.
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.SUMMARY | Alert Level 4 remains in effect over Mayon Volcano.
Mayon’s activity in
the past 24 hours was characterized by generally quiet lava effusion and
degassing from the summit crater. During
daytime yesterday, between 9:14 AM and 5:19 PM, two (2) episodes of
lava-collapse pyroclastic density currents (PDC) were visually observed on the
Miisi and Bonga-Buyuan Gullies within 4-5 kilometers of the summit crater. At
night, lava effusion from the vent continued to feed lava flows that have
maintained fronts at 3.3 kilometers, 4.5 kilometers and 900 meters on the Miisi,
Bonga and Basud Gullies, respectively, from the summit crater.
A total of
twenty-six (26) volcanic earthquakes and ten (10) rockfall events were recorded
by Mayon's seismic monitoring network. Sulfur dioxide (SO2) emission was
measured at an average of 1,533 tonnes/day on 28 February 2018. Deflation of
the lower slopes that began on 20 February is still being recorded by
electronic tilt. Nonetheless, overall electronic tilt and continuous GPS data
indicate that the edifice is still swollen or inflated relative to November and
October 2017, consistent with campaign Precise Leveling data acquired last
week.
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