01 June 2023


1 June 2023

03:00 P.M.


A total of nineteen (19) volcanic earthquakes associated with rock fracturing were recorded by Bulusan Volcano Network since 5:00 AM yesterday, 31 May 2023. Of these, five (5) volcanic earthquakes were located at depths of 2.72 to 6.56 kilometers beneath the eastern sector of Bulusan Volcano with local magnitudes ranging from ML1.8 to ML2.7. Current ground deformation data from continuous GPS and electronic tiltmeter stations have been recording persistent short-term inflation of the southeastern slopes since December 2022. During times when the volcano was visible, very weak to weak emission of white steam-laden plumes from the crater summit and active vents on the southeastern slopes could be observed. These parameters are likely related to volcanic gas activity within the edifice and may potentially trigger steam-driven or phreatic eruption from any of the active vents.


Alert Level 0 (Normal) is maintained over Bulusan Volcano but there are chances of steam-driven or phreatic eruptions occurring from the crater or summit area. Local government units and the public, however, are reminded that entry into the 4-kilometer radius Permanent Danger Zone (PDZ) particularly near the vents on the south-southeastern slopes, should be avoided due to the possibility of sudden and hazardous steam-driven or phreatic eruption, rockfall and landslide. 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 should be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall.


DOST-PHIVOLCS is closely monitoring Bulusan Volcano’s condition and any new development will be relayed to all concerned.