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KANLAON AND MAYON VOLCANO LAHAR ADVISORY

18 December 2024

10:00 AM

 

Based on the Philippine Atmospheric Geophysical and Astronomical Services Administration (PAGASA) Tropical Cyclone Bulletin No. 3 issued at 05:00AM today December 18, 2024, the Shear Line and Tropical Depression Querubin (and their interaction) will potentially bring heavy to intense rainfall over several areas in southeastern Luzon, Visayas and Mindanao, even those far from the projected path of the tropical depression. Moderate to heavy rainfall is expected over the Bicol Region and Negros Island in the coming days. This can generate volcanic sediment flows or lahars, muddy streamflows or muddy run-off in rivers and drainage areas on the monitored active volcano. DOST-PHIVOLCS thus strongly recommends increased vigilance and readiness of communities in pre-determined zones of lahar and related hazards on these volcanoes.

 

Prolonged and heavy rainfall may generate post-eruption lahars on major channels draining Kanlaon Volcano by incorporating loose material from remnant pyroclastic density current (PDC) deposits of the 9 December 2024 explosive eruption. Potential lahars and sediment-laden streamflows may occur along the Tamburong Creek in Biak-na-bato and Baji-Baji Falls and Talaptapan Creek, in Cabacungan, La Castellana. Post-eruption lahars similar to the 5 June 2024 lahars can affect these and communities downstream of these creeks.

 

Heavy rainfall may also generate post-eruption lahars on major channels draining Mayon Volcano by incorporating loose material from remnant PDC deposits from the January-March 2018 eruption. The bulk of erodible PDC deposits occupy the watershed areas of the Miisi, Mabinit, Buyuan and Basud Channels. In addition, older and erodible eruption deposits on the watershed areas of the eastern and western slopes of the edifice and can be remobilized as non-eruption lahars by erosion of banks and channel beds. Lahars can threaten communities downstream of the above channels with inundation, burial and wash away. Potential lahars and sediment-laden streamflows may occur along the Miisi, Binaan, Anoling, Quirangay, Maninila, Masarawag, Muladbucad, Nasisi, Mabinit, Matan-ag, Basud and Bulawan Channels in Albay Province.

 

DOST-PHIVOLCS is monitoring volcanic unrest in Mayon and Kanlaon 24/7 and any new development will be communicated immediately to the public.

 

DOST-PHIVOLCS

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