Bulusan Volcano shows unrest, PHIVOLCS at Alert Level 1

On Friday, Bulusan Volcano in Sorsogon experienced 69 volcanic earthquakes, according to the Philippine Institute of Volcanology and Seismology (PHIVOLCS).

Forty-two of these events were volcanic tremors lasting between one to 16 minutes.

The volcano emitted 809 tonnes of sulfur dioxide on Monday, with plumes reaching up to 150 meters in height—four times the usual background level pre-eruption.

PHIVOLCS reported that the volcano's edifice remains inflated and maintained Alert Level 1 (Low-level unrest) as of Monday.

Entry into the four-kilometer radius permanent danger zone around Bulusan Volcano is prohibited, along with flying aircraft near the area due to potential sudden steam-driven or phreatic eruptions.

Local authorities and residents are advised to exercise caution in the two-kilometer extended danger zone on the southeast flank, which remains susceptible to ashfall, pyroclastic density currents (uson), rockfall, and other volcanic hazards.