Philippine Institute of Volcanology and Seismology, Powered by Joomla!
BULUSAN VOLCANO BULLETIN, 24 June 2016, 08:00 A.M. PDF Print
Friday, 24 June 2016 07:43

Yesterday, from 9:00 AM to 9:18 AM, Bulusan Volcano’s northwest summit vent emitted a dirty-white steam-and-ash plume that crept downslope in a west-northwest direction, in what can be described as a low-energy ash eruption. Although the activity was visually observed, no seismic signals were detected prior to or during this, indicating a shallow volcanic source. Traces of ash fell on  Brgys. Poblacion, Añog and Bacolod in the Municipality of Juban and Mabini in Municipality of Casiguran, Sorsogon Province. Sulfurous odor was also reported in Brgys. Mabini, Bacolod, Añog and Puting Sapa, Juban.

Bulusan Volcano’s seismic monitoring network recorded two (2) volcanic earthquakes during the past 24 hours. Precise leveling survey last 27 April-5 May 2016 measured slight deflationary changes of the edifice relative to February 2016. However, ground deformation measurements from continuous GPS data as of 2 June 2016 indicate slight inflation of the edifice since May 2016.

Alert Level 1 (abnormal) remains in effect over Bulusan Volcano. This indicates that hydrothermal processes are ongoing beneath the volcano that may lead to more 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.