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Philippine Institute of Volcanology and Seismology, Powered by Joomla!
MAYON VOLCANO BULLETIN 16 January 2018 8:00 A.M. PDF Print

Quiet lava effusion from a new summit lava dome, lava flow down the Miisi and Bonga Gullies and lava collapse events characterized Mayon Volcano’s eruptive activity in the past 24 hours. A total of nine (9) episodes of tremor, four (4) of which accompanied short-duration lava fountaining, and 75 lava collapse events, corresponding to rockfall along the front and margins of advancing lava and short pyroclastic flows downriver of Miisi Gully within the PDZ, were recorded by Mayon’s seismic network. Collapse events and some degassing events at the summit crater generated ash that rose to two kilometers and fell on barangays of Camalig, Guinobatan and Polangui. Lava flow on the Miisi Gully has presently advanced to approximately two kilometers from the crater, while shorter volume lava flows have been emplaced on the upper slopes of the Bonga Gully.

Alert Level 3 remains in effect over Mayon Volcano, which means that it is currently in a relatively high level of unrest as magma is at the crater and hazardous eruption is possible within weeks or even days. The public is strongly advised to be vigilant and desist from entering the six (6) kilometer-radius Permanent Danger Zone (PDZ) and the 7-km Extended Danger Zone (EDZ) on the southern flanks due to the danger of rockfalls, landslides and sudden explosions or dome collapse that may generate hazardous volcanic flows. Increased vigilance against pyroclastic density currents, lahars and sediment-laden streamflows along channels draining the edifice is also advised. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden eruption can be hazardous to aircraft. Based on the seasonal wind pattern, ash fall events may most likely occur on the southwest side of the volcano. DOST-PHIVOLCS maintains close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.