Volcanic Advisory

MAYON VOLCANO BULLETIN 25 October 2018 08:00 A.M.
Mayon Volcano’s seismic monitoring network recorded three (3) volcanic earthquakes during the past 24 hours. Moderate emission of white steam-laden plumes that drifted southwest was observed. Sulfur dioxide (SO2) emission was measured at an average of 806 tonnes/day on 24 October 2018. Precise leveling data obtained on 30 August to 03 September 2018 indicate significant short-term deflation of the edifice relative to 17-24 July 2018. However, the volcano generally remains inflated relative to 2010 baselines. Electronic tilt data further show pronounced inflation of the mid-slopes beginning 25 June 2018, possibly due to aseismic magma intrusion deep beneath the edifice.

Alert Level 2 currently prevails over Mayon Volcano. This means that Mayon is at a moderate level of unrest. DOST-PHIVOLCS reminds the public that sudden explosions, lava collapses, pyroclastic density currents or PDCs and ashfall can still occur and threaten areas in the upper to middle slopes of Mayon. DOST-PHIVOLCS recommends that entry into the six kilometer-radius Permanent Danger Zone or PDZ and a precautionary seven kilometer-radius Extended Danger Zone or EDZ in the south-southwest to east-northeast sector, stretching from Anoling, Camalig to Sta. Misericordia, Sto. Domingo must be strictly prohibited. People residing close to these danger areas are also advised to observe precautions associated with rockfalls, PDCs and ashfall. Civil aviation authorities must advise pilots to avoid flying close to the volcano’s summit as airborne ash and ballistic fragments from sudden explosions and PDCs may pose hazards to aircrafts.