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OPEN-FILE REPORT

Philippine Institute of Volcanology and Seismology, Powered by Joomla!
MAYON VOLCANO BULLETIN 04 April 2018 08:00 A.M. PDF Print
Wednesday, 04 April 2018 08:08

Mayon Volcano’s seismic monitoring network did not detect any volcanic earthquakes during the past 24 hours. Weak to moderate emission of white steam-laden plumes that rose up to 500 meters before drifting west-northwest and southwest occurred throughout the day. Fair crater glow from the summit could be observed at night. Sulfur dioxide (SO2) emission was measured at an average of 991 tonnes/day on 02 April 2018. Medium-term deflation has been recorded by electronic tiltmeter since 20 February 2018 despite short-term episodes of inflation at the lower and middle slopes. Precise leveling data obtained on 22-29 March 2018 indicate deflation of the edifice relative to the 10-19 March 2018 surveys. However, overall ground deformation data indicate that the edifice is still inflated relative to pre-eruption baselines.

Alert Level 2 currently prevails over Mayon Volcano. This means that Mayon is at a moderate level of unrest. DOST-PHIVOLCS reminds the public of 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. Active river channels and those perennially identified as lahar prone areas in the southern and eastern sectors should also be avoided especially during bad weather conditions or when there is heavy and prolonged rainfall. 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. DOST-PHIVOLCS is closely monitoring Mayon Volcano’s activity and any new significant development will be immediately communicated to all stakeholders.

DOST-PHIVOLCS