Mayon Volcano seems to quiet down but Alert Level 3 remains in effect.
By Ellalyn De Vera-Ruiz
Mayon Volcano appeared to quiet down today as just five rockfall events were recorded in the past 24 hours.
However, the Philippine Institute of Volcanology and Seismology (Phivolcs) said quiet lava effusion from the new summit lava dome and lava collapse events continue to occur.
It said rockfall events were generated by the collapsing lava front and margins of the advancing lava flow on the Miisi Gully and by shedding from the summit dome onto the Bonga Gully.
Currently, the Miisi lava flow has advanced to three kilometers from the summit crater well within the permanent danger zone (PDZ).
Phivolcs said ash clouds were lofted from the rockfall events as well as from the persistent disintegration of lava on the advancing front of the Miisi lava flow before drifting to the southwest.
It continues to observe an increase in sulfur dioxide emission measuring at an average of 1,131 tons per day.
It also noted a sustained swelling or inflation of the edifice since November 2017, consistent with pressurization by magmatic intrusion.
Alert level 3 remains in effect over Mayon Volcano as it continues to be in a high level of unrest.
Phivolcs said magma is creeping up the restive volcano's crater and hazardous eruption is possible within weeks or even days.
It advised the public to be vigilant and prevent from entering the PDZ and the seven-kilometer extended danger zone on the southern flanks due to the danger of rockfalls, landslides and sudden explosions or dome collapse that may generate hazardous volcanic flows.
It also asked for increased vigilance against pyroclastic density currents, lahars and sediment-laden streamflows along channels draining the edifice is also advised.
Civil aviation authorities were asked to advise pilots to avoid flying close to the volcano's summit as ejecta from any sudden phreatic eruption can be hazardous to aircraft.
This photo taken on January 17, 2018 shows an aerial view of the Mayon Volcano (Phivolcs / Manila Bulletin file photo)