Taal Volcano Shows Heightened Activity, PHIVOLCS Warns of Potential Eruption

The Philippine Institute of Volcanology and Seismology (PHIVOLCS) has issued a precautionary advisory for Taal Volcano, warning of a potential eruption following increased seismic activity. Currently under Alert Level 1, recent developments suggest the possibility of a sudden phreatic or minor phreatomagmatic eruption.

PHIVOLCS reported a significant increase in real-time seismic energy measurement (RSAM) since July 6, 2025, alongside ongoing volcanic tremor. This surge, coupled with a lack of observable degassing from the Main Crater, could indicate a blockage of volcanic gas pathways. Such blockages can lead to short-term pressurization within the volcano, potentially resulting in an explosive release of steam or a minor eruption involving magmatic materials.

Two volcanic earthquakes were also detected on Saturday, July 5, 2025, attributed to magmatic processes beneath the volcano. While sulfur dioxide (SO2) emissions have been low since June 2025, PHIVOLCS emphasizes that reduced emissions do not signify an end to volcanic activity or the threat of an eruption.

A phreatic (steam-driven) eruption occurred on June 17, lasting 17 minutes, underscoring the volcano’s unpredictable nature. PHIVOLCS Director Dr. Teresito Bacolcol clarified that the current advisory is a precautionary measure, not a forecast of an upcoming major eruption.

Given these observations, PHIVOLCS reiterates that entry into Taal Volcano Island, particularly the Main Crater and Daang Kastila fissure, remains strictly prohibited as it is a permanent danger zone. Local government units are advised to prepare for potential increases in volcanic SO2 and implement health mitigation measures. Civil aviation authorities are urged to warn pilots to avoid flying above the island due to ash hazards.

Taal Volcano, the Philippines’ second most active volcano, continues to be closely monitored by PHIVOLCS, with further updates to be issued as necessary.