MANILA - The Philippine Institute of Volcanology and Seismology on Wednesday raised the status of Kanlaon Volcano in Negros Island to Alert Level 1, saying it is at an "abnormal condition" and has entered a period of unrest.
The state seismology office reminded local government units and the public that entry into the 4-kilometer radius permanent danger zone "must be strictly prohibited due to the further possibilities of sudden and hazardous steam-driven or phreatic eruptions."
Phivolcs also urged civil aviation authorities "to avoid flying close to the volcano’s summit as ejecta from any sudden phreatic eruption can be hazardous to aircraft."
Since March 9, Kanlaon Volcano’s seismic monitoring network recorded a total of 80 volcanic earthquake including 77 low frequency events associated with magmatic fluids beneath the edifice.
"The increased seismic activity could be succeeded by steam-driven or phreatic eruptions at the summit crater, despite the absence of visible degassing or steaming from the active vent this year," Phivolcs said.