Bulusan Volcano erupts anew, ashfall blankets parts of Sorsogon

Bulusan Volcano erupted again on Tuesday evening, sending ashfall across several barangays in Sorsogon and prompting renewed warnings from authorities amid ongoing volcanic unrest.

According to the Philippine Institute of Volcanology and Seismology (DOST-PHIVOLCS), the phreatic eruption occurred at 7:43 PM and lasted approximately 77 minutes based on seismic and infrasound monitoring.

Although the eruption plume was obscured by cloud cover, it is believed to have drifted southwest, affecting nearby communities with ashfall.

Significant to trace ashfall, measuring up to about one centimeter in some areas, was reported in the municipalities of Irosin, Juban, and Bulan. Affected barangays include Cogon, Tinampo, Monbon, Bolos, Gulang-Gulang, Gabao, Bulawan, and Macawayan in Irosin; Guruyan in Juban; and Zone 7, Somagongsong, Beguin, and Aquino in Bulan. Residents in Cogon and Bagsangan also reported rumbling sounds during the eruption.

As of 8:00 p.m., PHIVOLCS recorded a total of 54 volcanic earthquakes on Friday. Sulfur dioxide (SO?) emissions, a sign of volcanic activity, reached 548 tonnes per day—well above the baseline level of under 200 tonnes.

Despite the eruption, Alert Level 1 remains in effect over Bulusan, indicating low-level unrest. However, authorities warn that more phreatic eruptions could follow. Entry into the 4-kilometer Permanent Danger Zone (PDZ) remains strictly prohibited, while extra caution is urged within the 2-kilometer Extended Danger Zone (EDZ), especially on the volcano’s southeastern flank.

PHIVOLCS emphasized the risks of pyroclastic density currents, rockfalls, and ashfall. Residents in affected areas are advised to wear face masks or use wet cloths to avoid inhaling ash, particularly vulnerable groups such as the elderly, those with respiratory issues, pregnant women, and infants.

Civil aviation authorities have also been alerted to advise pilots to steer clear of the volcano’s summit, as ash can pose serious hazards to aircraft.

Those living near rivers and streams, particularly on the western side of the volcano, are reminded to stay alert for possible lahars—volcanic mudflows—should heavy rains coincide with further activity.

PHIVOLCS assured the public that it continues to closely monitor Bulusan’s activity and will issue updates as necessary.—LDF, GMA Integrated News