12 Agosto 2022


12 August 2022

09:00 A.M.     



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


A total of 13,572 tonnes/day of volcanic sulfur dioxide or SO2 gas emission from the Taal Main Crater was recorded yesterday that produced significant volcanic smog or vog over Taal Caldera. Airborne volcanic gas is expected to be drifted to the general east to north-northeast of Taal Volcano Island or TVI based on air parcel trajectory data from PAGASA. SO2 flux since 15 July 2022 has averaged ­­­­7,818 tonnes/day, an increase from the average of 1,289 tonnes/day between May and mid-July 2022. Since the beginning of August 2022, there has been an increase in degassing activity in the form of visible upwelling of volcanic fluids in the Main Crater Lake and emission of voluminous steam-rich plumes that last night rose 2,800 meters above TVI. Vog over the Taal Caldera yesterday was observed to thicken between 9:00 AM to 2:00 PM, while sulfurous stench was reported by residents of Banyaga, Agoncillo; Poblacion 5, Boso-boso, and Gulod, Laurel; and Poblacion, Talisay, Batangas. Crop damage that likely resulted from acid rain was reported in Cabuyao, Laguna last 8 August 2022. A total of five shallow (5) volcanic tremor events 3 to 8 minutes in duration were recorded in the past observation period.


As a reminder, vog consists of fine droplets containing volcanic gas such as SO2 which is acidic and can cause irritation of the eyes, throat and respiratory tract with severities depending on the gas concentrations and durations of exposure. People who may be particularly sensitive to vog are those with health conditions such as asthma, lung disease and heart disease, the elderly, pregnant women and children. For communities that can be affected by vog, please be mindful of the following.


  1. Limit your exposure. Avoid outdoor activities, stay indoors and shut doors and windows to block out vog.
  2. Protect yourself. Cover your nose, ideally with an N95 facemask. Drink plenty of water to reduce any throat irritation or constriction. If belonging to the particularly sensitive group of people above, watch over yourself and seek help from a doctor or the barangay health unit if needed, especially If serious effects are experienced.


In addition, acid rain can be generated during periods of rainfall and volcanic gas emission over areas where the plume disperses, causing damage to crops and affecting metal roofs of houses and buildings.


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.