BULUSAN VOLCANO BULLETIN 26 October 2015 8:00 A.M. PDF Print

Bulusan Volcano’s seismic monitoring network detected one (1) volcanic earthquake during the past 24 hours. Weak emission of white steam plumes, 50 meters high, that drifted northeast was observed coming from the new and southwest vents, while no steaming was observed from the northwest vent. Precise leveling surveys on September 1-6, 2015 indicated slight inflationary changes of the volcano’s edifice relative to July 2015, although ground deformation measurements from GPS data indicated a slight deflationary trend since August 2015.

Alert Level 1 (abnormal) remains in effect over Bulusan Volcano. This indicates that hydrothermal processes are underway beneath the volcano that may lead to steam-driven eruptions. The local government units and the public are reminded that entry to the 4-kilometer radius Permanent Danger Zone (PDZ) is strictly prohibited due to the possibility of sudden and hazardous steam-driven or 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 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. DOST-PHIVOLCS is closely monitoring Bulusan Volcano’s condition and any new development will be relayed to all concerned.