In the past 24-hour period, the Taal Volcano Network recorded one hundred forty-one (141) volcanic earthquakes, including one hundred twenty-one (121) volcanic tremor events having durations of two (2) to thirty (30) minutes, seventeen (17) low-frequency volcanic earthquakes, three (3) hybrid events, and low-level background tremor that has persisted since 07 July 2021. Two strong volcanic tremor events were recorded at 4:36 AM and 6:53 AM at ML 2.6 and ML 4.1, respectively, and felt at Intensity II. These events were accompanied by rumbling sounds as reported by residents of Barangays Banyaga and Bilibinwang, Agoncillo, Batangas.
Activity at the Main Crater was dominated by upwelling of hot volcanic fluids in its lake which generated plumes 1,500 meters tall that drifted to the northeast and southwest. Sulfur dioxide (SO2) emission averaged 3,004 tonnes/day on 11 August 2021. Based on ground deformation parameters from electronic tilt, continuous GPS and InSAR monitoring, Taal Volcano Island has begun deflating in April 2021 while the Taal region continues to undergo very slow extension since 2020.
Alert Level 2 (Increased Unrest) now prevails over Taal Volcano. DOST-PHIVOLCS reminds the public that at Alert Level 2, sudden steam- or gas-driven explosions, volcanic earthquakes, minor ashfall, and lethal accumulations or expulsions of volcanic gas can occur and threaten areas within and around TVI. DOST-PHIVOLCS strongly recommends that entry must be strictly prohibited into Taal Volcano Island, Taal’s Permanent Danger Zone or PDZ, especially the vicinities of the Main Crater and the Daang Kastila fissure, and occupancy and boating on Taal Lake. Local government officials are advised to continuously assess and strengthen the preparedness of previously evacuated barangays around Taal Lake in case of renewed unrest. Civil aviation authorities must advise pilots to avoid flying close to the volcano as airborne ash and ballistic fragments from sudden explosions and wind-remobilized ash may pose hazards to aircraft. DOST-PHIVOLCS is closely monitoring Taal Volcano’s activity and any new significant development will be immediately communicated to all stakeholders.
DOST-PHIVOLCS
