By Chito Chavez
The activity at Mayon Volcano in the past 24 hours was marred by sporadic and weak lava fountaining, lava flow and degassing from the summit crater.
As a result the Philippine Institute of Volcanology and Seismology (Phivolcs) seismic monitoring network has recorded a total of 94 volcanic earthquakes, most of which corresponded to lava fountaining e
Although the upper slopes were heavily obscured, the seismic record indicated discrete episodes of lava fountaining that lasted five to 50 minutes.
Throughout the night, Phivolcs noted lava flows and consequent incandescent rockfalls were observed in the Miisi and Bonga-Buyuan channels.
Effused volumes of incandescent lava flows have advanced to 3.3 kilometers, 4.5 kilometers and 900 meters down the Miisi, Bonga and Basud Gullies, respectively, from the summit crater.
State volcanologists added that pyroclastic density currents or PDCs have deposited to the 4.6, 4.5 and 4.2 kilometer reaches of the Miisi, Bonga and Basud Gullies, respectively.
Recent heavy rainfall also generated channel-confined lahars in the Anoling channel and sediment-laden stream flows in channels where PDC deposits were emplaced.
Electronic tilt and continuous GPS still record sustained swelling or inflation of the edifice since November and October 2017, consistent with pressurization by magmatic intrusion.
Phivolcs added that Alert Level 4 remains in effect over Mayon Volcano.