IROSIN, SORSOGON: After a three- day lull, Bulusan volcano erupted again for the third time this week spewing a 1.5-kilometer-high ash plume.
Mount Bulusan belched at 2:55PM on Friday ash plume clouds affecting six villages of Juban town, the Office of Civil Defense Bicol reported.
The restive volcano erupted twice classified as phreatic or steam-driven explosions on June 16. The first eruption took place at 11:02 a.m. then another explosion took place 18 minutes after.
The small, explosion-type event lasted for about two minutes based on seismic record but was not observed visually due to thick clouds covering the summit.
Rumbling sound was reportedly heard yesterday between 5 a.m. to 7 a.m. by local residents of barangay Monbon in Irosin town at the west-southwest side of the volcano.
Alert Level 1 remains in effect over Bulusan Volcano, which means that hydrothermal processes are underway 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.
The area was also declared as no flying zone for precautionary measures. Pilots are advised to avoid flying close to the volcano’s summit as ash from any sudden phreatic eruption can be hazardous to aircraft.
Ruben Dimaano, chief of provincial disaster risk reduction disaster management office (Pdrrmo) officer said that should Bulusan volcano unrest intensified, at least 100,000 people will be evacuated.
Dimaano said the residents from Casiguran, Juban and Irosin will be evacuated in the coming days if heightened unrest is declared by Phivolcs.
The people living within valleys and along river channels are warned to be vigilant against sediment-laden stream flows and lahars in the event of heavy and prolonged rainfall.
The Philippine Institute of Volcanology and Seismology (Phi-volcs) is closely watching the activities of three volcanoes, namely; Mount Mayon in Albay, Bulusan in Sorsogon and another one in Taal province.
Currently, Mount Mayon is at Alert Level 2 status and may erupt anytime while Mount Bulusan is Alert Level 1.
Phivolcs scientists are also studying Bulusan’s ash to check the possibility of a magmatic eruption that could lead to a full blown explosion.
Phivolcs official said the most active part of Bulusan is in the west side of the volcano facing the municipalities of Juban and Irosin.
The last major eruption of Mount Bulusan took place in the 17th century and is generally known for its sudden steam-driven or phreatic explosions.