Sorsogon: The Philippine Institute of Volcanology and Seismology (Phivolcs) reported on Tuesday an increased seismic activity at Bulusan Volcano but maintained Alert Level 0 as no magmatic eruption is foreseen.

According to Philippines News Agency, a total of 90 volcanic earthquakes were recorded by the Bulusan Volcano Network, with most of these being weak volcano-tectonic events linked to rock fracturing within five kilometers beneath the volcano. Other monitoring parameters remain at background levels, with degassing activity from visible vents described as "very weak" to moderate. Sulfur dioxide emissions were measured at below-average levels of 40 tons per day as of March 12, and no significant ground deformation or changes in thermal springs have been recorded.

Phivolcs noted that past phreatic eruptions at Bulusan were often preceded by sporadic swarms of volcanic earthquakes. While Alert Level 0 indicates no expected magmatic eruption, authorities reminded the public to avoid the four-kilometer Permanent Danger Zone, particularly near vents on the south-southeastern slopes, due to the possibility of sudden steam-driven eruptions that may generate pyroclastic density currents, ballistic projectiles, rockfalls, avalanches, ashfall, and other volcanic hazards.

Local government units are urged to review emergency plans and prepare response measures in case the volcano's alert status is raised to Level 1. Civil aviation authorities were also advised to alert pilots to avoid flying near the summit, as ash from sudden eruptions can pose a hazard to aircraft.

Phivolcs said it continues to monitor Bulusan Volcano closely and will provide updates when the situation changes.