The Philippine Institute of Volcanology and Seismology (Phivolcs) on Friday warned of possible lahar flow from Mayon Volcano in Albay due to shear line-triggered rains.
The state volcanology bureau told locals to brace for heavy rainfall in the southern portion of Luzon, citing the Philippine Atmospheric Geophysical and Astronomical Services Administration’s (PAGASA) forecast.
“[A] ‘shear line’ weather system affecting Southern Luzon is predicted to cause continued potentially high-volume rainfall over Bicol Region. Heavy to intense rainfall is expected over the Albay Province in the coming days,” Phivolcs said.
“This can generate volcanic sediment flows or lahars, muddy streamflows, or muddy run-off in rivers and drainage areas on the monitored active volcano,” it added.
The bureau said prolonged and heavy rainfalls could generate post-eruption lahars on major channels draining the volcano “by incorporating loose material from remnant pyroclastic density currents deposits from the January-March 2018 and June-December 2023 eruptions.”