Increased Seismic Activity Detected at Taal Volcano Network
The Philippine Institute of Volcanology and Seismology (Phivolcs) issued a warning on Sunday about heightened seismic activity that could lead to a phreatic or minor phreatomagmatic eruption. The alert focuses on data from the Taal Volcano Network (TVN), which monitors the volcano closely.
Phivolcs reported that seismic stations on Taal Volcano Island have recorded a steady rise in real-time seismic energy measurement (RSAM), accompanied by ongoing volcanic tremors. This increase in seismic energy is a critical indicator that the volcano’s activity is intensifying.
Seismic Data and Volcanic Gas Emission Trends
Since July 1, 2025, the TVN has recorded two low-frequency volcanic earthquakes. Despite the rising RSAM values, no degassing plumes have emerged from the Taal Main Crater since the increase began. This absence of visible gas release raises concerns about potential blockage within the volcano.
Phivolcs also highlighted that sulfur dioxide emissions have been low since June 2025, with the latest measurement on July 4 averaging 415 tons per day. The combination of increased seismic energy and reduced gas emissions suggests that volcanic gas pathways may be clogged.
Implications of Gas Pathway Blockage
According to Phivolcs, the blockage could cause pressure build-up beneath the surface. This pressurization might trigger sudden steam-driven eruptions or minor phreatomagmatic activity. Such eruptions can produce ashfall and release hazardous volcanic gases, posing risks to nearby communities.
As a result, Phivolcs maintains Alert Level 1 on Taal Volcano, emphasizing that the volcano remains in an abnormal state. “It should not be assumed that the unrest has ceased or that the threat of eruptive activity is over,” the agency cautioned.
Safety Measures and Public Advisory
Phivolcs strictly prohibits entry into Taal Volcano Island, particularly near the main crater and the Daang Kastila Fissures. Aircraft are also banned from flying close to the crater to ensure safety.
Residents living near the volcano are urged to secure their homes by closing doors and windows to limit exposure to volcanic smog, also known as vog. Wearing face masks and protective goggles is recommended to guard against harmful gas emissions.
Local authorities and experts continue to monitor the situation closely, ready to update the public should conditions change.
For more news and updates on Taal Volcano activity, visit Filipinokami.com.