Philippine Standard Time


Bulusan Volcano’s monitoring network recorded five (5) volcanic earthquakes during the past 24-hour observation period. Weak emission of white steam-laden plumes from the lower southeast vent that drifted to the northeast was observed. Ground deformation data from continuous GPS measurements indicate short-term inflation of the edifice since May 2021 while the longer-term trend since May 2019 indicates that the edifice is still deflated. Tilt data from the upper slope show sustained inflation since 6 March 2021. The increased seismic activity is likely due to shallow hydrothermal activity following rainwater recharge into Bulusan’s hydrothermal system.


Alert Level 1 status prevails over Bulusan Volcano, which means that it is currently in an abnormal condition. Local government units and the public are reminded that entry into the 4-kilometer radius Permanent Danger Zone (PDZ) must be strictly prohibited and that vigilance in the 2-kilometer Extended Danger Zone (EDZ) on the southeast sector must be exercised due to the increased possibilities of sudden and hazardous phreatic eruptions. Civil aviation authorities must also advise pilots to avoid flying close to the volcano’s summit as ash from any sudden phreatic eruption can be hazardous to aircraft. Furthermore, people living within valleys and along river/stream channels especially on the southeast, southwest, and northwest sector of the edifice should be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall should phreatic eruption occur. DOST-PHIVOLCS is closely monitoring Bulusan Volcano’s condition and any new development will be communicated to all concerned stakeholders.