A small-volume lahar that began at approximately 7:04 PM yesterday, 26 June, was detected by seismic and infrasound stations of the Bulusan Volcano Network (BVN). The event lasted fifty-four (54) minutes during a period of thunderstorm over Sorsogon Province. Ocular investigation by the Bulusan Volcano Observatory (BVO) confirmed thin channel-confined lahar deposits along Calang Creek in Brgy. Cogon, Irosin, the major channel draining the southwestern slopes of Bulusan.

Alert level 1 still prevails over Bulusan Volcano, which means that it is currently at low-level unrest. 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 slopes of the volcano edifice should be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall especially after a phreatic eruption occurs. DOST PHIVOLCS is closely monitoring Bulusan Volcano’s condition and any new development will be communicated to all concerned stakeholders.

DOST-PHIVOLCS