MAYON VOLCANO ADVISORY 27 January 2018 10:30 AM PDF Print

Heavy rains over the Province of Albay brought about by the tail-end of a cold front have increased the dangers of syn-eruption lahars on major channels draining the Mayon Volcano edifice that have been deposited with thick pyroclastic density current or PDC material and ashfall. The total volume of PDC deposits so far deposited on the watershed areas, mostly on the Buyuan and Miisi channel watershed, is approximately 9 million cubic meters, excluding unverified deposits on the northern flank. The total volume of ashfall on the western sector is roughly 1.5 million cubic meters. These deposits can be remobilized by rainwater and generate lahars by themselves and or by incorporating existing erodible material on channel banks.

PHIVOLCS therefore warns of potential lahars and sediment-laden streamflows on all river channels draining the slopes of Mayon Volcano especially the Buyuan, Miisi, Mabinit, Basud, San Vicente, Buang, Quirangay and Masarawag-Maninila that may be generated by heavy rainfalls brought about by the cold-front. Communities and local government units beside these river systems are advised to be additionally vigilant and to move residents to high ground when heavy rains occur. Alert Level 4 remains in effect over Mayon Volcano and DOST-PHIVOLCS maintains its close monitoring of Mayon Volcano and any new development will be communicated to all concerned stakeholders.