07 August 2022

7 August 2022
11:30 P.M.


This is a notice of increased volcanic SO2 gas emission from Taal Volcano.


A total of 17,141 tonnes/day of volcanic sulfur dioxide or SO2 gas emission from the Taal Main Crater was recorded this morning, the highest since the alert status was lowered to Alert Level 1 on 11 July 2022. Airborne volcanic gas is expected to be drifted to the general east to west of Taal Volcano Island based on air parcel trajectory data from PAGASA. SO2 flux since 15 July 2022 has averaged 6,041 tonnes/day, an increase from the average of 1,289 tonnes/day between May and mid-July 2022. Increased degassing has been visible in the form of upwelling in the Main Crater Lake and voluminous steam-rich plume activity in the past six days. A total of three (3) tremor events 9 minutes in duration were recorded in the past observation period.  


DOST-PHIVOLCS reminds the public that Alert Level 1 prevails over Taal Volcano, which means that it is still in abnormal condition and should not be interpreted to have ceased unrest nor ceased the threat of eruptive activity. Should an uptrend or pronounced change in monitored parameters forewarn of renewed unrest, the Alert Level may be raised back to Alert Level 2. Conversely, should there be a return of monitoring parameters to baseline levels after a sufficient observation period, the Alert Level will be further lowered to Alert Level 0. At Alert Level 1, sudden steam-driven or phreatic explosions, volcanic earthquakes, minor ashfall and lethal accumulations or expulsions of volcanic gas can occur and threaten areas within TVI. DOST-PHIVOLCS strongly recommends that entry into TVI, Taal’s Permanent Danger Zone or PDZ, especially the vicinities of the Main Crater and the Daang Kastila fissure, must remain strictly prohibited. Local government units are advised to continuously assess previously evacuated barangays around Taal Lake for damages and road accessibilities and to strengthen preparedness, contingency and communication measures in case of renewed unrest. People are also advised to observe precautions due to ground displacement across fissures, possible ashfall and minor earthquakes. 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 aircrafts.


DOST-PHIVOLCS is closely monitoring Taal Volcano’s activity and any new significant development will be immediately communicated to all stakeholders.