PHIVOLCS: MAYON VOLCANO BULLETIN 02 February 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.
Sporadic and weak lava fountaining, lava flow and degassing from the summit crater characterized Mayon’s activity yesterday. Much of the activity produced low white to light-gray plumes, with the exception of one event that produced a 1000 meter-tall gray ash plume at 9:18 AM. Throughout the night, quiet lava effusion fed lava flows in the Miisi and Bonga-Buyuan channels and barrancos between these. The Miisi and Bonga-Buyuan lava flows have advanced to 3.2 kilometers and 4.3 kilometers, respectively, from the summit crater.
A total of seventeen (17) volcanic earthquakes, most of which corresponded to sporadic and weak fountaining events, ten (10) tremor events were recorded by Mayon's seismic monitoring network. Source